The REAL source of Gravity might SURPRISE you...

[@ScienceAsylum]

*1. Why does the motion arrow turn?* Well... we're imagining that the squirrel is in some kind of fluid flow. It's not but it's a useful picture, so just imagine he is. If a real squirrel was in a real fluid flow like that, what would happen? The squirrel would turn. In a spacetime diagram, a rotation is a change in speed... also known as an acceleration. You're welcome 🙇‍♂️ *2. Wouldn't that mean that taller things would accelerate more because the gradient is bigger?* No. While the total difference between the top and bottom of something like a building is bigger than it is for a squirrel, that doesn't actually matter. Curvature isn't a global phenomenon. It's a local one. Imagine both the building and the squirrel are giant stacks of infinitesimally-separated clocks. It's the gradient between _adjacent_ clocks that matters. Although, that does pose a different problem: spaghettification. Different parts of an object can experience different time gradients if they're tall enough. That means different parts of them will fall at different rates and be torn to shreds. This is a common event near stellar-mass black holes. *EDIT on 6/29/2020:* *3. Isn't this a circular argument? Doesn't gravity cause the time dilation?* It only seems circular because of a common misconception you picked up along the way. At 2:40, I state that gravity is _not_ the cause of the time dilation. It is the result of it. The cause of the time dilation is the Earth (or whatever source mass). The Earth causes the dilation _directly._ That's the connection between energy/mass and spacetime described by Einstein's field equation. We don't have a mechanism for that because it _IS_ the mechanism that causes gravity. Note: When I say "gravity" in this video, I mean "gravitational attraction." That attraction is observed behavior, not a force. *4. Isn't time dilation caused by motion?* Yes, that is one type of time dilation called kinetic time dilation. Gravitational time dilation is a completely separate effect. They're two different types. How much there is of each depends on the circumstances. Tall buildings and GPS satellites are predominantly affected by the gravitational kind. Astronauts on the ISS are predominantly affected by the kinetic kind.

[@valeriobertoncello1809]

But if curvature is a local phenomenon rather than a global one, why is spacetime considered "locally flat" everywhere?

[@luudest]

How does gravitotional time diletation affect photons?

[@maxlovesvivan]

what about you smash the earth into a flat pan? Or even just creat a mathematically infinite plate? then there will be no gravity gradient, while the squrrell still falls to the ground

[@ailblentyn]

Gravity seems almost reminiscent of refraction!

[@rajesh_shenoy]

First, Einstein tells me that it's not me being heavy, but the Earth trying to smash into me! 😩 Now you're telling me that the Earth is trying to spaghettify me all the time! 😵 I want a new planet! 😭😭

[@jacqualinesalb6431]

I think I understand, I might not, but because of this video, I believe I’m much closer to understanding time-space. I’m 75 years old, and I’ve got a lot of un-learning to do. Thank you

[@ScienceAsylum]

*"I’ve got a lot of un-learning to do."* That's fairly normal when learning modern physics. (modern physics = most physics discovered after 1885)

[@rustysteel8714]

You're not alone, js!

[@MatHelm]

I'm 75 backwards... 57, So, I believe time in this dimension is basically the physical movement of subatomic particles. A simple 2D representation would be a atom moving forward. As the electrons orbit the nucleus, with the speed of light being the limiting factor in this dimension, on the half of that orbit moving in the same direction as the atom, the atoms forward speed must be subtracted from the electron's speed of light orbit, and is not added to the backwards half of the orbit because speed of light in this dimension. So the faster forward the atom moves, the longer it takes for the electron to complete a orbit. Hence time passing slower as you approach the speed of light is because the movements of a atom is slower. Of course the point at which a atom theoretically reaches the speed of light it would be at absolute zero. As in frozen dead still. It came to me after studying the speed limiting factors of a helicopter...

[@ninadgadre3934]

I hope I am as enthusiastic and curious about science when I am 75!! Kudos to you

[@rmlmrnda]

It’s rare to find a person with an established way of thinking while also having an open mind. Salute!

[@murilovsilva]

This crazy looking man who speaks in hand waves and eye rolls has taught me more about gravity in 7 minutes than all other videos on the internet that I have ever watched. Great work!

[@UnclePorkchop]

I just said the same thing... and now I need an aspirin

[@menonijk]

Can’t agree more!!!

[@EricT3769]

Ditto

[@lenpalmeri6228]

Agreed! Superb insight.

[@craigstock7471]

you didn't learn shit, gravity is electrical charge.

[@samiverstine7351]

I’m a physicist and I never knew how to correlate time with gravity. You are a great teacher!

[@MsRofex88]

I would like to bring to the attention of experts (preferably physicists or mathematicians and / or scientists), a scientific question on communication between two people, one of which is under the influence of gravitational force. Thanks for your attention! QUESTION: Einstein said: "If all space exists now, let all time (past, present and REAL future) exist now." OBSERVATION: If we point the telescope 🔭 towards the sun, we will observe it (holographically) as it was 8 minutes in the past (from the point of view of the astronomical distance), since the light takes 8 minutes starting from the sun to reach the retina of our eyes. But the gravity exerted by the solar mass is such as to bend time to make it flow 2 seconds slower than us earthlings, so those who, ideally speaking, are in the sun would live 2 REAL seconds in the past than us. QUESTION: If a man were immersed in a gravitational field such as to bend time up to 1 minute slower (in the past) than me and, the man I want to relate to was 1 meter away from me, approaching me, I could squeeze his hand, see him and speak to him at the same instant that he starts listening to me? And he, immersed in the gravitational field, could he hear and see me? Would I be able to converse with my interlocutor in the same space (and in the same instant in time with which I start the conversation) to speak directly with whoever is in front of me, even if the latter lived a minute in the past with respect to me? In other words, according to Einstein, gravity slows down time, but with the distance of one meter, I would see my interlocutor as: A) How is he REALLY 1 minute in the past and can I communicate with him in the same instant of time because the light would take a billionth of a second? 🤔❓❓ B) I would see him holographically (as I see the sun eight minutes late) but I cannot communicate with him. ⏱️⌚ C) I wouldn't see him at all, it's impossible, unless I would talk to him through a wormhole. D) Other ........... (To you the answer I do not understand anything 🤷🏻‍♂️🤪 sorry).

[@rdean150]

@@MsRofex88 I would think that if he stayed in that gravity differential, he would perpetually be seeing you from a minute in your future. In which case, communication would depend entirely on him leaving messages that you can receive later. But how could you possibly respond to him if he stays ahead of you in time? What would he even be seeing? Would he be seeing your response to actions that he has not yet taken? No, I guess the motions would actually be locked in sync, him immediately seeing your reaction and you immediately hearing his words, even though there is technically a wide gap in time between them, so long as the two perspectives stayed constant. But if you were moving toward each other, they wouldn't stay constant, would they? Oh my this is a mind-bender.

[@flbmx98]

@@MsRofex88 I would imagine that if you were to try to shake his hand you would be increasingly rapidly pulled towards him and probably he towards you, until you met at a mostly equal velocity. Sounds painful. I would also imagine your words would be distorted, and would probably arrive to him late but be sped up as he hears it.

[@derryberry16]

@@MsRofex88 i think your observation is wrong. Coz you're forgetting to account thensum and its change on time as its a greater mass. Those sun people would argue that you're in the past and both of you wouldn't be wrong.

[@Wink-Wright]

@@MsRofex88 Necro'ing this to help others learn. Remember that dilation causes a disparity in the actual amount of time elapsed relative to another region of spacetime, which is proportional to the distance you each are to your respective masses. In general, the closer you are to a mass, the less time you will experience relative to the rest of the universe. If you are on the earth's surface, then there's some distance above from the sun's surface where the dilation is equal. If your friend was this altitude from the sun, your only obstruction is the ~8 minute delay that light takes to reach one another. You'd have a 16 minute round trip to communicate with one another at this point. Great! So move him closer to the Sun. Is your friend really in a space that has "slowed down" time? At this point he will appear to be moving slower, his light slightly reddened as the photons he emits stretch (called redshifting) relative to you. It looks like he's sped up slightly. Time isn't slower, per say, there's just literally less of it being experienced in this region of space, so you see more of it from your temporal vantage point of the earth. The word "delay" isn't really possible in this scenario, because there's not a "stream" of time that he is further behind on. You both experience time, both are in your respective present, but the *amount* of time you are experiencing is different. To your scenario, a bizarre gravity field that has some sort of limiting shell a meter in distance away. You would see basically the same thing, dilation. In order to not break causality it HAS to be something relative, say an extra minute per hour past. It would look largely the same. Your friend's movement would appear an extra 1/60th slowed down. If there were molecules between you there would be heat transferred (to your friend's side) as the slower moving gasses receive energy from the (see: RELATIVELY) faster gasses and his voice would be slightly lower pitch from the vibrations appearing stretched relative to your perception. You could shake hands, but your arm would move easier and would be younger then the rest of you when returned to your side. To your friend, you would appear to have a higher pitched voice, and have a hand that feels heavier to shake. The stars around him would appear to spin faster then they do to you. In conclusion, your question isn't really possible with the mechanisms possible via gravity. The only way you could get the delay described is for your friend to be on your side, step over for an hour by his then-current clock, then step back towards you. But, this wouldn't be the "delay" that you're looking for, he'd have experienced less time then the rest of the matter around you - he'd be younger. Option D, I guess. I hope this give you a new perspective, happy learning.

[@andrewyates89]

Having nicely explained all the relevant principles, the one thing that is virtually always omitted is an observation about the unbelievable small/large scale of these principles. The time dilation between two clocks, one at sea level and one on a 1-km high mountain is so small that they would differ by only one second after about 300 millennia. The resulting time "curvature" effect, if it was viewed as an arc from a center of rotation, would have a curvature radius of almost one light year. (Note that the point of rotation of this arc is vertically overhead for everyone on planet earth.) How can such a tiny time dilation-curvature cause such a noticeable effect that we call gravity? The answer is because every-thing in four-dimensional space-time is moving at the speed of light. For us ordinary folk, we are moving very, very predominantly in the time dimension "direction" at the speed of light. So, when you are travelling at the ridiculously fast speed of light on a trajectory that has a ridiculously slight curvature, the centripetal acceleration is not trivial. The formula for centripetal acceleration is speed squared divided by radius and, if you plug in the numbers, out pops our old friend 9.81 meters per square second, directed towards the point of rotation about one light-year overhead. To me, this is General Relativity simplified on the back of an envelope.

[@alexisbelfer7881]

Wow thanks a lot. I was wondering exactly that and was douting the video just because the maths didn't seem right.

[@jorgepiresjunior]

At the beginning It was confuse, but at the end it seemed like the beginning.

[@gregorylangston9489]

😂😂😂

[@akashpandey7806]

Beginning is end and the end is the beginning 😂😂

[@Iamyodaddy_]

Confused*.

[@aether-elephant]

It's fine, eventually the end will catch up with the beginning

[@foodwithlove4509]

😂😂😜

[@randybarnhill3098]

Great video. This explains why people on the top floor have to leave earlier than people on the bottom floor to catch the same bus to get to work.

[@maxmumbai1234]

Top floor folks reach the bus stop early because they use the elevator!

[@michaeltowler2632]

Haha!

[@RustyDockLight]

Oh, a wise guy eh? Nyuk nyuk nyuk.

[@mikejones6018]

Funny, that actually works

[@JustinBieberlakeish]

@@maxmumbai1234 Don't you mean deelevator?

[@simoncook1885]

I'm now lying down to ensure my body ages at the same rate.

[@donalain69]

Pamela Anderson hates you now..

[@resiwadofgore]

You aren’t laying, you’re lying. Grammar police out.

[@simoncook1885]

@@resiwadofgore edit button says what ?

[@resiwadofgore]

@@simoncook1885 lulz

[@MartianLivesMatter]

Thats funny haha

[@rondesantis7017]

Time Doesnt Wait For Me, It keeps on going. Well, I'm Taking My Time, I'm Just Moving Along, You'll Forget About Me, After I've Been Gone. It's Been Such A Long Time, I Think I Should Be Going. -- 1976 Boston

[@samwillard5688]

It's just outside your front door, after all.

[@bustedshark5559]

I just watched this with my 5-year-old great-grandaughter. She proceeded to walk up to my wife and declare that gravity was caused by a squirrel and two clocks. I'll try again in about 5 years! Excellent analogy though!

[@southface8838]

😂😂

[@rockhound3.14]

Lmao

[@keerthi3086]

😆. that's cute.

[@lastyhopper2792]

😅there're many terms that she wouldn't know, so she simply ruled it out of the equation. like, "..you can think of it like a -flow gradient- around the Earth.." she might don't know the concept of flow and gradient.. So she didn't even hear those words been spoken.. probably

[@hegemon3]

All hail The Time Squirrel.

[@walabter1887]

I would have never imagine a 7 seven minute video as mindblowing as this one thank you so much for all your effort

[@ScienceAsylum]

Glad you enjoyed it! 🤓

[@samuelgarrod8327]

Did any of it sink in?

[@savage22bolt32]

@@ScienceAsylum Constructive criticism: lose the background noise! The subject & your narration of it is great. The addition of distracting, monotonous & annoying music ruined the vid for me. I did not get past the halfway point.

[@wooddogg8]

@@savage22bolt32 Your loss, My friend. I come back to this video every few months, sometimes to blow friend's minds, sometime just because I want to. Never even noticed background noise, music or whatever you mean. Please try again to make it all the way through. It's only 8 minutes long. PEACE ✌😎

[@Icewind007]

I think this is the first time "might SURPRISE you" in a youtube title actually guessed right.

[@ScienceAsylum]

I'm not going to put something like that in the title if I can't _deliver._

[@kakalimukherjee3297]

@@ScienceAsylum You blow my mind even more than 3b1b, and at the same time, make perfect sense. There's no reason why you don't have million+ subs. Wait for it, I'm sure it'll happen

[@tricky778]

This squirrel was stationary in curved space-time, you'll never guess what happened next.

[@TheRogerbacon]

@@tricky778 how a single clock-wearing squirrel has been blowing the mind of scientists for over a century

[@rbaika9281]

Jj

[@Langkowski]

Sorry, but I still don't understand why time dilation would cause the squirrel to fall to the ground

[@AliothAncalagon]

There is just one person who is able to introduce me to a completely new way of thinking about the universe and is successful in making me understand it in less than 10 minutes. Never stop making these videos, please.

[@KAMiKAZOW]

The sick beats in the background don't hurt either.

[@mrhatman675]

Sorry but these vids give you the basic concepts behind these phenomenons you would have to use math to go deeper into it

[@mahxylim7983]

Do you watch physics video by Eugesshbfbaz(can't remember the spelling)...? His video is longer but is amazing too!

[@gabrielhamoui6504]

Pin Seng Lim could you please send the channel name with the correct spelling? I want to check him out!

[@hyronvalkinson1749]

@@mrhatman675 Yes, but these basic intuitions are often skipped when learning the complex way. I wish more professors would teach the concept first THEN the rigor, instead many of them like teaching rigor and proofs and hoping you'll make the intuitive connection on your own.

[@Viperzka]

This is the first analogy that has actually made the "gravity isn't a force, it's curvature" make sense.

[@kevinarturourrutiaalvarez2613]

X2

[@ItsEverythingElse]

The first? lol

[@narudavidkun]

yeah dude, the first that I see that does that

[@davidjacobs8558]

"curvature" is very confusing term. easier to understand description would be. a mass creates more space per volume near it. (as in Harry Potter's magic tent) a mass makes the time flow slower near it.

[@bk-sl8ee]

Yes it's the first video which literally gives you the feeling that gravity is not force at all!

[@dekippiesip]

Thanks a lot man, this is the first explanation of general relativity that actually makes intuitive sense! I always got very confused by those rubber sheet analogies, but this clears it up!

[@ScienceAsylum]

Glad I could help! 🤓

[@Capybearacuda]

... He mixed up the x variables. He propositions X as "time" but concludes it as a spacial direction of movement. to my knowledge time does not add physical energy to inert objects.

[@Capybearacuda]

the top of the squirrel would just be older than the bottom. the particle visual is confusing the way it looks like FORCE and not RATE of change

[@sivasakthisaravanan4850]

The problem with the rubber sheet is that it still requires gravity to make it curved! Carlo Rovelli's book was the first source for me where i read this 'time dilation causing objects to fall on the Earth' description.

[@LouDeeCruz]

@@ScienceAsylum Did You? You ignored the fact that Albert predicted time would slow or speed up under different gravitational potentials. But he did NOT predict resonant frequencies would change under different gravitational forces. Seeing as Resonance was observed and understood well before Albert. Please note the following well accepted scientific FACT: “The *damped* *natural* *frequency* is always lower than the natural frequency” Notice a stronger gravitational potential is damping the atomic clock at lower altitudes. Not Alberts fantasies.

[@TimpBizkit]

I was trying to work out why the squirrel didn't just start to spin, or why a stationary squirrel still falls.

[@erezsolomon3838]

"The best explainers of topics are the best understanders, that are best understood" - this is relevant to your channel; even though I understood gravity in the depth of Veritasium's video on it, you didn't fail to impress me when you offered a different perspective to this curious mind, and for that I am grateful. For making science more intuitive, while more fundamentally correct, I cannot thank you enough

[@YousefBenIsreal]

I can't think of another video that has ever obliterated my mind to this degree. An absolute mind melt down. The explanation was flawless but the impact it had on my perception of time and space was nuclear lol

[@knowbody4903]

Have you seen the movie Interstellar?

[@vladimircuellar3420]

Agreed

[@joecraven2712]

@@knowbody4903 Yes, most people watching this probably have and if not they’re missing out. One of favourite films of all time. Yet still I don’t see how it’s relevant to the original person’s comment?

[@random6033]

i knew most of it before so... nothing really changed, but that time gradient thing is kinda new, i mean i knew that it's relative

[@knowbody4903]

@@joecraven2712 it's literally a movie about complimentary concepts, Its relevance is self evident.

[@ShauryaSingh-ts2oc]

Dude that was mind blowing. Im as amazed as the Hoodie clone

[@b4ph0m3tdk9]

Me too, I went "wow" with him every time.

[@EpsilonAD]

I love this channel. I find happily odd and intelligent people (who communicate well) quite wonderful.

[@Sauromannen]

Honestly, I have studied General Relativity on post-graduate level, but this was the best explanation and visualization of gravity I have come across so far.

[@dannymccarty344]

Honestly? I was a professor of General Relatively. You must not have paid attention in class....the visualization? Lol

[@Sauromannen]

@@dannymccarty344, Yes, I always had a feeling that squirrels had something to do with it but it was never brought up during the classes.

[@MrOneNye]

@@dannymccarty344 you can't be a square on KZbin nowadays when the channel courts quirky folks. The roasting will leave you tender 🤣🤣

[@danielmconnolly7]

There is no such thing as gravity; It's a theory, not a physical reality.

[@Sauromannen]

@@danielmconnolly7 yes exactly. Why don’t you prove that by stepping out from the rooftop of your house? ;-)

[@wojo6567]

I'm reading a book on anti-gravity and just can't put it down.

[@1084kmp]

Shit hitting the fan yet? :)

[@kanopatterson9128]

What’s the book

[@Layarion]

@@1084kmp i think they mighta been making a pun

[@1084kmp]

@Layarion so am I :)

[@SouthCarolinaPrep]

Want Anti-Gravity,? Just train your clock to run in reverse.

[@JZainbear]

This explains why I got left back in the 10th grade for being too high.

[@timbrink]

If you were too high you would have skipped a grade.

[@kevinslattery5748]

Just lie down, gravity will be less! Say what❓

[@BobStBubba]

What happens when your head is spinning a mile a minute but your feet are just standing there. Just dance faster!

[@becknader2337]

😂😂😂

[@ldandco]

Actually, you would've been leading, not lagging

[@TheRealReVeLaTioN]

“What happens when there’s a gradient? Stuff.” 😄😆🤣

[@ScienceAsylum]

😆

[@IIVVBlues]

My bathroom scale is actually measuring time dilation. So, I'm not overweight, I'm just behind my time.

[@leechap3]

You're just expanding to keep pace with the expansion of the universe.

[@everyshade]

Ahead of your time.

[@claudiobertadeazevedo4669]

keep it ON the roof, as per de vídeo we all will benefit

[@SailingSarah]

D:

[@WagonLoads]

In space, no one can see your weight.

[@akpak4449]

I was expecting to learn a new way of understanding gravity, that NO-ONE on the KZbin talked about so far and man, you delivered!

[@gld1076]

waste of time .make fun because do ot know the subject or how c to expllain it in lay ma words.

[@Dombithesheep]

It's been a long time since I read about Einstein's theory of relativity (about time dilation) but didn't understand it, now I understand a little because you are using a crazy way ... thank you sir

[@McSupraQc]

A journey to the end of the universe by cool world, check it out my man 😉

[@VaiskHD]

@@McSupraQc yessir caliss go habs go

[@McSupraQc]

@@VaiskHD pouahahahaha esti d'malade 😎🤘

[@Harald-MacGerhard]

Nick, this may be my favoruite youtube video of all times. I just gotta love it 🤠🤩🥰😎 So someone jumps out from a building, why does he fall, yes because time runs faster at his feet than his head. And when I look at it, it all makes sense Nick, you are genius 😍

[@Teelirious]

Vids like this are why I'm a Patreon supporter and everyone else should be as well. Small price to pay for recommendable quality. Thx, Nick.

[@AironExTv]

Something just blew up. I think it was everything. Why has nobody talked about this before that I could randomly find ?!

[@Clich13300]

Many people talked about that but it is so incredible that you didn't searched fot it. Please try "gravity illusion" in the seaching part of youtube and you will find many videos about this subject, like the famous one from PBS space time : kzbin.info/www/bejne/hJPPg2Nnna1-bLc Regards

[@mekman]

Try here: kzbin.info/www/bejne/nZTZomR6drJgeqc

[@uvbe]

You don't watch Vsauce?

[@sadhlife]

read about relativity, it's all really good

[@jkvdv4447]

yeah something did blow...my head

[@marcosgonza]

Hoodie clone is the most similar to me of your clones.. most def

[@showcase-me]

Best Clone!!!

[@sidokouki670]

Watching this video and the PBS Space Time video finally helped me to get it, like, it was so mind-blowing that I couldn't stop thinking about it for a whole week! I'm still in awe and I just can't wrap my head around the idea that the universe just created itself.

[@ScienceAsylum]

It's pretty deep stuff. I'm glad our videos were able to help though.

[@MWTGoldenGun]

Well.... the universe didn't just create itself, and such an idea was never mentioned in the video.

[@wm437]

Nothing cannot create itself because it needs to be something before it can create itself. Only something or someone can create.🤔

[@adityan3208]

​@@wm437 well Stephen Hawking said otherwise?

[@gregaldr]

​@@adityan3208he was prideful like most other humans and refused to acknowledge his Creator and serve Him. He decided to be his own god. Often, the more esteemed one is the greater the temptation to let pride separate one from God. I have an IQ of 150 and I have strongly felt this way myself. By God's grace, He changed my heart and now I love Him and acknowledge Him as my Lord and Master. I no longer struggle with pride keeping me separated from my Creator and I am very grateful that He forgives my sin and I will be with Him eternally. My faith has grown much stronger over the years as I've read His word, prayed often, and watched God continue to work in my life and change me in good ways. God is good!

[@intsoumen]

A lot of scientist, mathematicians and philosophers like you try to explain this great Einstien's theory(and Gravity is not a force) visually on youtube and other media with animation. But this is the best video I have ever seen before. Greatly done. Thank you for sharing such content. This makes me subscribe to your channel.

[@robymaru03]

Me too he just got my subscription as well

[@intsoumen]

There is another video: kzbin.info/www/bejne/raPamHygd7qMjMU

[@hv3213]

haha yes, me too.

[@elodnagy4061]

just subscribed for the EXACT reason! lol PLUS i can share with my father in-law because I’ve been trying to explain and visualize this to him for weeks now to no avail! THIS WILL 100% convince him! I will post back with progress! THNX warden!

[@davidr5685]

Thank you very much! I've been trying to explain gravity to my kids ( 6 &4 yrs old). Most adults don't understand and I've never been able to really grasp it , but your explanation helps! Thanks for shedding more light!

[@ScienceAsylum]

Glad I could help 🤓

[@davidm4566]

Gravity is like sitting on your mattress with a bunch of various objects on it. The heavier the object, the deeper the squish in the mattress. We put more squish into the mattress so the smaller objects and their little squishes get absorbed into our larger squish, pulling them in! Or, you know, maybe a trampoline or something. Some videos on youtube have teachers putting out a tight cloth with various weights that really demonstrates this well: the heavier, the deeper they pull into the fabric. Some objects are even made to simulate orbit.

[@coenraadloubser5768]

@@davidm4566 Maybe matter squishes spacetime because its made from it so there's less spacetime there to pass through?

[@keerthi3086]

@@coenraadloubser5768 interesting. more like knotted space time is matter, so around matter there's twisting like near a knot. All this is just fairy tale for now. Will need mathematical proving or disproving.

[@keerthi3086]

@@vhawk1951kl It's an irony you would type all that comment using your computer or phone that are built from using the very same models of modern physics which you say is no different from religion.

[@eduardo_guimaraes]

That was awesome! I'm an engineer and I always look for science content online but this one is in a whole new level of originality! Those were incredibly interesting concepts to learn, I never thought of gravity that way

[@integralsun]

There’s something squirrelly about all this.

[@gamalipi]

Nick, you really love this topics and thats why we all love to see you explaining them. Thanks a lot!

[@grahamecampbell7002]

My physics teacher once told me that time is immaterial, so I gave him my work assignment three days late.

[@oleksandrlevkovych8591]

Lol

[@constantinototis4859]

Nice and elegant excuse.

[@ANDROLOMA]

If time is immaterial, then what is material? Time = life.

[@JordonPatrickMears11211988]

@@ANDROLOMA so life is immaterial? What then is material? You answer a question you didn't ask, and ask a question you don't answer.

[@ANDROLOMA]

@@JordonPatrickMears11211988 What was the question I answered that I didn't ask? I asked a question you proved incapable of answering, smart guy. So you simply deflected instead of answering, the way I would expect of any grade schooler. Grow up, instead of down.

[@velkoivanov9155]

Or as a wise man once said - the squirrel falls simply because its future is on the ground

[@LuisAldamiz]

Or as a wise squirrel once said: why not climb that tree and challenge Einstein?

[@VitorSalsicha]

picture of captain america pointing at the camera*

[@grantlaing7465]

Great explanation. Thanks!

[@mr.noname6109]

@@andrewboychurch Aristotle's ideas are tortole for the present time. 🐢

[@EricVerbose]

Time dilation...the past is on the ground...so perhaps the squirrel falls because he is doomed to repeat history?

[@adarshmarvel7735]

Imagine two earths placed side by side Don't they attract towards each other? Yes they do ,although their is no time difference between them Gravity due to time dilation ❌ Time dilation due to gravity ✔

[@varunas9784]

I understood this with two main presumptions 1. Time always flows forward n when in doing so whenever it encounters a mass it slows down at its surface just like a flow of a liquid in a pipe 2. On a fairly modest n large scales comprehensible to humans, objects tend to move towards a place where time passes slowly hence creating an illusion of gravity Jeez! how intriguing n weird of a concept is this!!!

[@rajesh_shenoy]

Now imagine that this flow of time was laminar all along due to the "pressure" of the Big Bang, and at some point in the future, it will break into turbulent flow! 😜

[@jamestheotherone742]

We are evolved from the bottom of a quite steep spacetime gradient. What we pecieve as "1 G" is the culminations of an unimaginable number of spacetime differential interactions between the particles that make up your brain that is reading this, to the aggregate of this entire patch of the Universe.

[@hunk2140]

you just reversed scientific consensus..its the Gravity that creates the illusion of Time..how can he claim that time is more fundamental than gravity..?! well i say gravity is more fundamental than time..in fact time exists because of gravity..that's why Einstein said time is an illusion..

[@jamestheotherone742]

@@hunk2140 That is incorrect. Spacetime are the interrelated definitions of... well space and time. Gravity is a consequence, even an artifact, of spacetime curvature. The Universe is clever like that.

[@EricVerbose]

If things move towards a place where time passes more slowly...and the big bang has all the stuff passing at minimal time...it's like everything is slowing down out of the bang, the same way things are experiencing heat death. Time death. Everything is trying to enter lower energy states? And if we consider time to be "change" (of energy...for of energy...), then time/gravity is a consequence of the universe trying to spin down from the Big Bang. Is this sensible?

[@htmohadighigpsshefalykhatu862]

Whoa!!! Didn't see THIS coming! That's the easiest and most mind-blowing explanation I ever heard! Whoa!!! Whoa!!! Whoa!!! Thanks Professor😊

[@ryanedgerton1982]

Just realized that this means an hourglass is both the perfect symbol and a cognitive paradox. It's the influence of time measuring the passage of time, which means it's basically time measuring itself...

[@Yismeicha]

Whoa

[@d3.1415]

Interesting thought. So would that mean it actuall measures nothing, or is representing time squared? I wonder what happens to the hourglass if it stops moving through time.

[@arturzathas499]

meta

[@harsh3624]

Wtf.

[@kxjx]

So what is happening if the whole hourglass is in freefall? And doesn't the same apply to pendulum clocks also? I believe we have calibrated the hourglass based on our knowledge of the local time dilation gradient? That is to say what the hourglass is doing is actually measuring the time dilation near the surface of the earth (acceleration due to gravity). And then doing a multiplication by putting in a lot of sand (or counting a certain number of pendulum swings) to calibrate the device to something else (like rotations of the earth, orbits around the sun, or an atomic clock or something).

[@javy111112113]

How would you then explain that, in relation to the “gradient”, a vertical and horizontal object fall at the same rate of acceleration in a vacuum? Wouldn’t the vertical object be exposed to a bigger gradient difference making it accelerate faster?

[@yiani31]

oh snap

[@1amswill]

This is it! A eureka moment for me. The first video out of hundreds to make me truly understand what gravity is.

[@JailBiden]

Ditto here

[@kabellion]

Yeah , for me too, now i have some serious questiona about time tho....

[@autoparts6873]

Yeah, how is this not common knowledge if it isn’t fraudulent?

[@markvanslooten5311]

So you know why and how mass causes a time gradient??

[@1amswill]

@@markvanslooten5311 nope. I'd have to find another video for that

[@jeff7731]

you laid on a greenscreen in your pajamas doing the newborn shuffle for that shot in space...... respect!

[@ginabonina6427]

Oh man I FINALLY GET IT!!! This was a superb explanation! I watched another video yesterday and I felt frustrated that I still didn't get it. Fun, casual and simplified and conversational rather than lectured. And the use of the word 'intuition' really hit home. And the hoodie clone LOL...Thank you.

[@ScienceAsylum]

Glad I could help! 🤓

[@Așchiuț_ă]

@@ScienceAsylum if there's a time gradient the squirrel can rotate in time in your graph but in the same place, why to fall?

[@Skiskiski]

The real reason the squirrel fell down was because he was drinking to pass time.

[@clairerogerson2153]

This explained time causing gravity better than anything else I’ve seen!

[@Ghostalking]

This is a good introduction, follow up on VSauce for a more in-depth look at it

[@whitestarHokie]

Would this mean that, in essence, an anti-gravity device would therefore be a time machine? "Speeding up" local time such that it is operating fast at the feet of the squirrel than at the head of the squirrel would force the vector to point in the opposite direction, there by forcing the squirrel to levitate.

[@fernandoroque]

Wtf stop blowing my mind, no pls continue

[@oscarword775]

Haha, that's smart. If you can figure out how to make a time machine, then this should work perfectly.

[@ZoonCrypticon]

I think you could levitate the squirrel also if there would be an equal mass on top of his head...letting the attraction of the both masses exerting on each other aside...the squirrel would levitate..and later on, unforutantely, rupture in two pieces. Maybe if you would create "Anti-mass" then you would have a backflow of time and anti-gravity?

[@kosatochca]

@@oscarword775 as long as it is causally consistent it's totally theoretically feasible

[@oscarword775]

@@kosatochca That's pretty cool to know. Thanks.

[@smiddywesson2703]

The time/space gradient explanation for gravity would finally account for the old experiment where they drop a feather and a bowling ball in a vacuum, and they hit the ground at the same time. It's the interaction of time and space that makes them fall, and removing the wind resistence by conducting the experiment in a vacuum, makes them fall at the same rate and clarifies why. This was a GREAT video. Thank you, thank you, thank you.

[@Mysoi123]

One way to think about this is to consider a sphere, which is a three-dimensional object with a curved surface. On a sphere, straight lines do not exist, and the shortest distance between two points is along a great circle, which is a circle that cuts the sphere in half and passes through its center. Similarly, in a curved spacetime, the path that an object follows between two points is not a straight line, but rather a geodesic, which is the shortest distance between the two points on the curved spacetime. In the case of the feather and the bowling ball dropped in a vacuum, the absence of air resistance means that the objects experience no external forces other than gravity, and so they follow the same geodesic path through spacetime, falling towards the Earth at the same rate. This is why they hit the ground at the same time, despite their different masses.

[@narfwhals7843]

@@Mysoi123 Just a small correction about your phrasing. The great circle does not "pass through" the center of the sphere. The great circles are those circles on the sphere which have their center in the center of the sphere. I suppose you mean the disc of that circle passes through the center of the sphere?

[@Mysoi123]

@@narfwhals7843 that’s correct! Thanks. I missed the radius part in my phrase.

[@redshift0916]

​@@Mysoi123 No! "objects experience no external forces other than gravity" Objects in freefall - i.e. following geodesics - don't experience any force at all, especially not gravity. That's the whole point.

[@Mysoi123]

@@redshift0916 Oh! I employed ChatGPT to rectify my grammar, and it included the additional phrase >>other than gravity

[@stevepreskitt283]

It's interesting that this illustration also explains intuitively why objects fall at the same rate in a vacuum, regardless of their mass. The degree of time dilation per unit of distance remains the same regardless of the mass of the falling object, so by extension, so does the acceleration imposed by gravity.

[@esvin8771]

What I don't understand is if this theory is correct than any object existing in our physical plane is in constant motion, but that would mean an object that is stationary and completely isolated from any other object of any size, it would mean it would move regardless, which goes against the laws of physics which state an object at rest will stay at rest unless acted upon by an equal and opposite force.....???? It seems this theory would only work if their are 2 objects, Mass is a missing factor in this theory, it affects if it can make any sense.

[@JuiceTheLemon]

@@esvin8771 everything around you is in constant motion. our galaxy is flying though the universe while we spin in circles around it and so on until we get to our planet. everything at 'rest' around you only appears that way because you are traveling through this universe at the same speed they are. if your in a car driving and set a piece of paper on the other seat its not moving in your point of reference but to everyone else outside of your car, that piece of paper is in fact moving down the road along with you and your car.

[@adriananastasescu2644]

However, I got to think, that the objects with lower density would be longer thus the acceleration gradient from top/bottom is bigger. It means that the feather falls quicker than the lead. Some kind of contradiction to the law of the same rate falling in vacuum...

[@arentol7]

@@esvin8771 Newtons law says that an object will stay at rest unless acted on by an outside force. This theory is literally and directly about the way two objects affect each other, so how would it be a problem in your scenario? If there was a universe with only one particle in it then this theory would still work, it just wouldn't apply to that universe because there isn't a second particle to experience the effect. If there were two particles or more then this theory works and applies as expected.

[@bvarsho1]

Then why do all objects of different size fall at the same rate? Clearly it is not some intrinsic property of the falling object of any size. The reason it falls then, must be outside the body and act independent of the body.

[@joeimbesi99]

"Holy time dilation Batman, I misunderstood the Gravity of the situation".. "Indeed Robin, Indeed"

[@DieFoe]

Whhhaaaappp!!!

[@ABWEndon]

If you take the "it" out of "gravity" you're left with "gravy". And just like gravy, gravity can either flow smoothly or be lumpy depending on the size of mass involved.

[@nelsonclub7722]

Have you been to my Aunties for tea again?

[@ABWEndon]

@@nelsonclub7722 Nothing like chewing on a lump of gravy... helps you to make the most out of your Sunday roast!

[@TheRealReVeLaTioN]

I have So Many questions… but I’ll just binge a bunch of your videos before asking them. 😄🍻

[@20runninginthebackground]

That explains why my beard turned white but not my pubic hair!

[@billping2633]

LOL oh to funny....but it may be true why do feet get bigger as you get older?

[@braatsch]

yes

[@marcus23antonius]

If so, then why does the scrotum wrinkles more than the face.

[@markg7963]

Proximity to mass?😂😂😂

[@Zeldaschampion]

I was going to upvote this but I think this comment should stay at 69 likes.

[@RM_VFX]

So my head is slightly out of sync with my feet? Finally I have something to blame for my clumsiness.

[@ScienceAsylum]

Yep! And that's not even because of a relativity. They're actually out of a sync by a _noticeable_ fraction of a second because of how your nervous system works. Your brain just compensates and adjusts your perception so you don't notice 🤯

[@midnightdragonfly9707]

And explains why I hit a curb pulling into a gas station today..can happen while driving, too😳

[@issacflores9278]

Basically input lag

[@gregorybrian]

@@ScienceAsylum This is why in martial arts, you are taught to not think. The time it takes you to think interrupts the flow. Or as baseball legend Yogi Berra said about success in batting: “You can’t think and hit at the same time.”

[@chiefgully9353]

@@issacflores9278 output in this case but yhea. In put is the fraction of a second your brain takes to realize what your eyes are seeing. The total lag between input and output is reaction time.

[@ronaldderooij1774]

Right, now the million dollar question: What causes time to vary near masses or energy?

[@rajesh_shenoy]

Because mass/energy bends spacetime.

[@mrjones5829]

Thats simple, spacetime curvature. What causes these is the far bigger question!

[@buddyywilsonn]

@@mrjones5829 dark matter

[@fatsquirrel75]

@@rajesh_shenoyHe's asking why does spacetime bend near mass and energy, and your answer is because mass and energy bend spacetime. That's an observation, not an explanation.

[@MarkRawling]

I'm pretty sure all of this is due to entanglement...

[@gracialonignasiver6302]

Most intuitive explanation I've seen on this topic. Took me weeks to understand this when I was trying to study it and you break it down so well.

[@ScienceAsylum]

Glad I could help 👍

[@Dekoherence-ii8pw]

Really? I DIDN'T GET IT. There was an explanatory gap between "time travels at a different rate" and "the squirrel goes down". I don't see how the one implies the other.

[@upandatom]

"ignoring any engineering difficulties" haha way ahead of you...

[@John_Fx]

If Jade doesn't understand it, I don't have a chance.

[@nikolaki]

Fountains of Paradise by Arthur C Clarke.

[@ScienceAsylum]

@@John_Fx Jade is just showing her camaraderie. We're both theoretical physicists who are terrible at practical experiments 🤷‍♂️

[@MagruderSpoots]

I love engineering difficulties, but I still had to like this comment.

[@Mrcometo]

"Assume the cow is a sphere..."

[@PaulMillard1973]

Mind blown!! An actual comprehensive explanation of the effect of gravity and how time produces what we can observe. Brilliant video!! 👍🏼🚀

[@matthewryan2887]

"Got any questions about gravity" I think I have more than i did when i started this video

[@b213videoz]

Surprisingly not my case this time

[@arunravi5457]

same for me

[@timsmith7351]

Density and Boyancy . Gravity is not real

[@Bootmahoy88]

That’s was an exquisite explanation. I actually think I’m beginning to grasp the concept of Space-time. Wow. Thankyou.

[@limbridk]

The flow-gradient is the BEST explanation I have heard for all of this stuff. And I've watched soooo much about this. On this channel and others.

[@KOtedra]

Its totally wrong. Time passes faster at your head than at your feet because of gravity aka space-time deforming. If there is no gravity, there is no deformation of the space-time so time doesnt pass differently. So right after he says that there is no gravity but time passes differently, everything lies on a false assumption.

[@limbridk]

@@KOtedra I don't think you grasp the essence of the description. It's a chicken and the egg kind of scenario. You need to understand the whole concept, not try to break it down in that way. Because else you just end up thinking there has to either be a chicken or an egg at the start of the logic chain.

[@KOtedra]

@@limbridk Nope that is wrong. This is not a chicken egg thing. The universe lies upon a grid called space-time, and if you have mass(higgs boson consecuence), there is "friction" with the grid which causes a deformation of space-time called gravity. The sketchy part is that interaction between things with gravity should generate a "boson"(responsible for the quantum attraction or repulsion) called graviton, and we dont find it. So the problem is not finding out what is gravity, that is very well known, is finding how gravity works in an elemental way to join it to the other elemental forces of the universe and make a theory of everything.

[@joelcurtis562]

@@KOtedra I agree. In the set-up he says "Imagine there's no gravity but there's time dilation caused by the Earth." Well, the whole point of GR is that gravity just IS the time-dilation, i.e. the curvature of spacetime. So he effectively says "imagine there's no gravity but there's gravity caused by Earth." The time gradient thing is a neat way to try to visualize or intuit what's happening, but I agree the logic of the video is less than enlightening. I think this video is best understood as an attempt to illustrate the move from thinking of free fall as 'forced' motion in a flat spacetime to thinking of it as 'unforced' motion in a curved spacetime.

[@AyratHungryStudent]

- Forget everything you've learned in school about gravity. - Way ahead of you.

[@nelsonclub7722]

“The fact that we live at the bottom of a deep gravity well, on the surface of a gas covered planet going around a nuclear fireball 90 million miles away and think this to be normal is obviously some indication of how skewed our perspective tends to be.” Douglas Adams

[@bearwithabark]

Don’t panic, cover it in an S.E.P field.

[@plupkination]

Excellent point! If you want to really grasp how UN-normal our universe is, try this.. seriously contemplate our sun! Here is a giant ball of fire, that has already been burning for BILLIONS of years... and it will continue doing so for BILLIONS more.. Anyone who has ever just tried to keep a campfire going can appreciate the mammoth achievement that a star is!

[@i.m.i.7310]

Thanks for all the fish. D

[@i.m.i.7310]

Centi.

[@nelsonclub7722]

@@i.m.i.7310 In the beginning the Universe was created. This has made a lot of people very angry and been widely regarded as a bad move.

[@andreasschau4215]

Wow! Thats the absolute best explanation of this i have ever come across!

[@SocksWithSandals]

I'm with Hoodie Clone "Whoa!" For the first time in my life I know how gravity works.

[@jamestheotherone742]

Theoretically.

[@sMASHsound]

now i know WHYYYY gravity works.

[@WTC2014]

It sound to me more like the universe "lags" where more stuff is, causing a difference in how fast it can process information...

[@marcussandell9659]

Simulation theory

[@fischX]

You assume that time exist as a property separate from the universe (like in a processing machine we run on) but it most certainly does not. Because this set of rules or universe runtime environment has to do all those relativistic stuff so to do that it self has to be above our space and time imagination. For example in this engine the big bang had to be simultaneously to us or we could not measure the CMB (no time has passed for the CMB since big boomy) or to say it wir acid clone: "There is just NOW!"

[@circa_76er]

It's a good intuitive way of thinking about it.

[@not-high-on-life]

if we live in a simulation and there is a certain clock rate at which simulation is being performed we have no way to access it, it does not matter for us if a single tick takes "a femtosecond" to compute outside or "a whole second", the concept of the outside time is inaccessible to us

[@circa_76er]

@@not-high-on-life Hello Sir. The way I understand time is that it is a function of the physical world. No energy flow or decay = no time...

[@sanjayarun4947]

I love how you have very different interpretations for the common science facts. Mind blowing..

[@Arghya_10]

Is it the same reason why people don't age and get older in space? Due to the clock is ticking really slow?

[@ScienceAsylum]

See answer 4 in the pinned comment.

[@gabrielsventura77]

This explanation is amazing, I have never heard of gravitational time dilation before and it makes so much sense. I am Brazilian and I recently discovered your videos. I'm really enjoying it and I'm very happy that the videos have Portuguese subtitles. :)

[@jangapardhu5300]

Anyways the particles are “point like” not exactly points.

[@LuisAldamiz]

Do we even know that? Aren't they just "probability waves" instead? Particle only means "small part" (Lat. "particula"), we have been brainwashed by pop-science to imagine them as "balls" or "dots" but they are only partly (at best) that way, they are mostly wave-like instead.

[@greytroll1632]

And they are also waves, which can feel the gradient.

[@joaquinel]

this is pointless

[@davidgumazon]

@@LuisAldamiz that's how water and air behaves water-like air-like but it's Fat Particles that requires Diet before Scientists could even predict their position.

[@gardenhead92]

That wouldn’t apply here though because quantum mechanics and general relativity don’t mix.

[@OscarMtz88]

Why does everything fall at the same rate though? Wouldn’t that mean if I had a “longer” object it should fall faster than a “short” one?

[@IAmNotARobotPinkySwear]

I think, technically, it would, but its off by femto orders, so small that on our macro level it's the same rate. The gravitational constant is different on the surface of earth then it is say 80km up, even if its a small difference. That difference implies that the rate of acceleration would also be different. The first time I heard about this "time dilation causes gravity" was here: kzbin.info/www/bejne/nZTZomR6drJgeqc 4 years before Nick lol

[@erickgutierrez924]

It does a bit. Take a hose of water and set it to the minimum you will still get a stream. If you hold it low then it remains a stream, but if you take it high enough it will start to break into droplets. That's precisely what happens to you if you stand in a black hole, your feet would go way faster than your head and that would break you to bits. The thing is that in earth and in many other stellar bodies the gradient is so smooth that everything falls at the same rate. That would change if you had an object much bigger. That I suspect is what caused the mercury orbit anomaly. Because is big enough and close enough to the sun so the gradient would be significant enough.

[@trevinbeattie4888]

If we assume a constant time gradient, which is good enough for objects that are tiny compared to the size of the Earth, then the height of the object won’t matter because the shear change at any given height is proportional to that height, resulting in the same change of angle. I suspect that for objects which are significantly large relative to their distance from the center of mass, some more advanced calculus would be needed.

[@Royvan7]

it is not that the curved time is acting a force. it's that cause time curves the "straight line" path through it has to curve too. the object is just following the "straight" path through spacetime. if the object is spread out enough that the "straight" paths diverge or converge from one another then there will be tidal "forces" inside the object that effects things tho. if you want more rigorous detail on the quoted terms. "straight" -> a geodesic. the path through a curved "space" that one would travel if they did not turn. "forces" -> still an effect of curvature so not really a force just looks a bit like one "space" -> a manifold. a topological space.

[@davidadams421]

Taking this one step further, if you radically increase the curvature, like say around a black hole, that's where spaghettification comes from where the curvature gradient at your feet is so markedly different from that at your head you end up being stretched into a single stream of atoms. Similar, in fact, to the early transporter technology that sent your matter stream over USB.

[@Hasanthe787]

This one of the best videos that explains gravity, every other one just puts a trampoline/plane on the screen and say that's gravity as if I don't know that already

[@millicentsmallpenny5837]

Yuh, all it is doing is using gravity to explain gravity. Not very satisfying. (Explanation: "Small ball rolls toward big ball, because it is downhill toward the big ball, so gravity tales the small ball toward the big ball") You just used gravity to explain why gravity does what it does!!!!!!?.......!!!?? All both explanations do is say that somehow the warping of space time causes gravity. But neither explains the mechanics of WHY it causes gravity

[@basti4655]

Thank you for explaining gravity the correct way. Love this!! There are still so many videos that explain gravity is a force that magically pulls objects down... and don't explain the physical cause for it.

[@aphinion]

For some reason I find this time dilation easier to understand than the warped space. I could never really get my head around that. But time dilation actually makes a lot more sense in my brain, lol. Fascinating video!

[@mikedauglash3227]

there's a classic saying Matter (clump of matter like earth) tells spacetime how to curve; spacetime tells matter(other stuff that not connected to earth) how to move

[@mattedwards6195]

Or maybe we're in a simulated universe and both speed and mass require more computational power therefore slowing the simulation speed local to a large mass and/or fast moving object. The closer you are to the mass the slower the sim speed due to larger processing requirements. Take a black hole for example, where time theoretically stops at the event horizon. The larger the mass, the more processing required, the slower it goes. That makes a little more sense to me anyway.

[@lionelshaneyfelt5607]

love it

[@critter505]

This is more likely an explanation than the official theoretical one the video espouses.

[@seektruthnow.]

What causes gravity in a simulation like Grand Theft Auto. The Creator / programmer designs it to operate in that way. You don't need curvature of space-time. You just need the law to be established and so it is.

[@SSMLivingPictures]

I watch this video about once a year since it came out and I just now feel Im undertanding it haha. You said in a different video that time is a representation of causality and that connected some dots for me

[@semaj_5022]

Here from Matt's recommendation on Spacetime!

[@Lanka007]

me too

[@esra_erimez]

Salvador Dalí had time curvature figured out decades ago.

[@rillloudmother]

he actually got the inspiration from learning about physics.

[@markburch6253]

That doesn't explain table curvature

[@FirstCelestialEmperor]

I thought you were just gonna talk about higher dimensions or something but this was waaay more interesting!!!

[@snackentity5709]

the pop-sci media world has been doing an injustice to the physics that we do know by giving extra air-time to the overly-exotic theoretical physics hypotheses. they seem to think that interested laymen are not capable of going one step beyond the bowling ball on a trampoline analogy. it's sad, because the insights on these more proved-out topics are incredibly more interesting to explore deeply than going over the a surface-deep picture of the latest exotic theoretical hypothesis (which is almost certainly wrong)

[@timhallas4275]

@@snackentity5709 The bowling ball on the trampoline model for gravity is so intensely wrong, it makes me scream. It depicts space in 2 dimensions. I can't tell you how many kids have been de-educated by this bad science.

[@juzbecoz]

Thank you sir ,means time have any state ?

[@MattMcIrvin]

Gravitational time dilation was first measured in a vertical shaft that was maybe 10 feet from an office I had as a grad student. I met one of the people who did it. They used gamma-ray photons and measured the unbelievably tiny shift in their frequencies using something called the Mössbauer effect. This kind of precision experiment is... challenging.

[@bastadtroll8922]

liar

[@kippertrace5808]

@@bastadtroll8922 😍🤣

[@gregmellott5715]

Thanks for the substantive evidence. I believe I tried to think this same gravity effect through some time ago myself. I used the notion that all things were made up of energy flowing through areas of varying intensities of "field' strength. The high intensity areas cause the energy wave to flow slower causing it to bend. The field strength can get so strong that the flow can cause at least part of the wave to be drawn into the high intensity and even have it practically reverse its direction of flow. This is what can form particles that can get very knotted up into a stable pattern and so persist so we note them as an existing thing. This same time warping effect is what gives the particle a mass. And masses attract each other as they tend to have the effect of shrinking the space (though it may actually be simpler to understand it as a slowing of time) between them, upon the other interacting energy flows passing through that area. The relative slower speed of the energy flow (that causes everything to exist) makes time (the rate that things move) slower. And so, things happen using a smaller distance when noted as an observer in a more normal low energy space. This is what allows for something that needs a specific distance to exist in a weaker field to exist using a "smaller" distance in a stronger field. This allows the affect that has the mass effectively constantly sucking up some of the energy flow that passes very nearby into an area inside it that is very intense; thus, helping to make more "room" in the area outside of it as far as any energy flowing by notes it, as it attempts to fly "straight" by. If you might look at it as one particles energy flow affected by the another having a clear mass affect. As the contained flows cycle around in as stable way, they are getting slightly redirected toward the area that is nearer a mass. So, the cycling energy is repeatedly migrated a bit closer to the mass causing the slower expression of time that is shrinking the space more that is nearest it. If that particle was ideally between two such masses, the pull from the opposite directions cancels the pull affect out. This is why there is no gravity affect at the "center" of an object caused by that object. Energy would flow straight. And if it is straight away, it is in the most viable direction to escape from that affect's capturing ability. Though should there be an intense orbiting flow it must pass through, that could cause that path to be bent again and have that escape fail. This is also partly due to the fact that the speed that energy flows can only be at light's speed. So, the orbiting flow would favor having the "escaping" flow's wave edge move faster nearest the edge that is closest to that one orbiting) as it approached it (at any angle other than perpendicular) and thus lean to causing it to orbit also. This may be one way a stable flow could be made that causes a particle to exist. To say such an intense mass effecting field acts like a black hole is likely a bit extreme. Though in some ways it may be getting pretty close.

[@gregmellott5715]

I may be all wet in my calculations. Yet, I came to the conclusion: For every 100 lbs. of weight, there is about 60 Gigawatt-Hours of energy present in it. So, when you think of mass as energy trying to flow, mostly in a very small areas of high intensity with the rest of the area defining a particle being nearly empty space, it may be a bit more plausible to grasp that there are a serious number of ways for allowing that much energy to express the behaviors we note. With momentum we note that it inherently likes to stay in a location or move at the speed in a given environment without change. That partly may be due to the fact that once a stable internal pattern of flow exists in a particle for it to relate to the other mass and its gravity around is established, it takes time and energy to modify that pattern to address a different situation. One might note that the big bang energy had at least a nil mass affect in its flow at first. This allowed the inflation period to have an extreme rate of energy flow at first as the controlling factor was how fast the escaping energy moved compared to its immediate neighbors' flows. Time also ran at a slower rate (relative to near empty space) due to the very high energy intensities then. So, this slower "clock" made the inflation rate measure even faster when you have no outside observer to reference. So now, ideally, you might understand how gravity likely works a bit better than before. And momentum similarly.

[@bastadtroll8922]

@@gregmellott5715 what gibberiish! jesus christ just stop. do yourself a favour and learn some physics from the free mit courses and maybe some basic english too.

[@Jakubanakin]

So why are we still trying to merge gravity with the "other" forces, and search for its carrier particle when we have multiple ways for gravity to NOT be a force?

[@tommywhite3545]

The fundamental forces are not Newtonian forces, but interactions. Which is a bit misleading.

[@thedeemon]

The GR approach to gravity, as in this video, is not quantum, unlike other 3 interactions. So we've got no idea how to use it on a quantum particle that's in superposition of two places. Is the spacetime curved in two different ways at the same time? What would that ever mean? Hence all those attempts to quantize gravity...

[@ChaoticHero]

Really like to know that, too... so EM, Strong and Weak are forces within (?!) space(time?)... gravity on the other hand is an (inherent?) property of Space/Spacetime/Time?? So why unify things that are so different(??)

[@whitenoise1119]

Einstein’s GR is so far has the most predicting power for a theory of gravity. If we can come up with a unified theory that has greater predicting power, then we get more solid answers for questions like “are true singularities possible”

[@jamestheotherone742]

Mainly because if the politics of the camps of the theoretical physicist vs theoretical astrophysicist. Human beings could split a quark between themselves.

[@nathanokun8801]

It took me a long, long time to realize that time dilation caused the pull effect of gravity. Just bending the space would not force you to move, just change your direction when you moved. Time being different and slower closer to a gravitational attractor acts like a drag (like a car brake that is stuck on the stronger gravity side) that slews you toward that object when you move, AND EVERYTHING IS ALWAYS MOVING, along the time direction when stationary in the space region, but slower in the time direction when moving in the space direction (Special Relativity).

[@dominicellis1867]

So would that mean that dark energy could be described as the opposite flow of time dilation pushing space instead of bringing it closer. gravity curves in and dark energy curves out so maybe both dark energy and gravity are illusions of the ubiquity of the temporal distribution through space meaning that if we described time through quanta we could create a quantum relativity merging Einstein's theory of relativity with Schrodinger's quantum wave function illustrating the true nature of 70% of the universe.

[@kalokajoe357]

Dominic Ellis Negative pressure can have an anti gravitational effect for instance. Its a real effect.

[@heusker]

What if an object is stationary though, like imagine you hold a ball out of a window of a skyscraper. If you let go, why does the "drag" of time pull the top part of the ball toward the earth, like in a parabola, curve, or small orbit that occurs with moving objects?

[@nathanokun8801]

@@heusker There can be no "stationary". We are always moving at the speed of light either in time only (relative to some point is our position does not move compared to that point in space) or in a combination of space motion and time motion, all summed up to the same "speed" (the time axis uses "c", the fixed speed of light in our universe in a vacuum, times the local time rate of the object, "t", to give a distance "c x t", but with a minus sign in front of it to show that space distances and the time axis "distance" are opposites and will always stay summed to the same value. The only way you can be "stationary in a gravity field is if everything nearby is also falling at the same rate through that field (and you cannot see outside of that local area to tell if you are moving relative to the "outside world") or you are being held in position against gravity by some other force, in which case you feel "weight" toward the gravity source.as it is trying to speed you toward it and something is in the way. It is WHY THERE IS GRAVITY IN THE FIRST PLACE that is the question here and Einstein's M = E/(c-squared) creates a mass that is both inertial (resistance to an applied force) and gravitational (creates gravity around that mass). If energy creates mass and mass creates gravity, then just having "something" in a position, be it pure energy (confined in a loop, say) or a solid fermion-based object (matter) will slow down time nearby as it stretches space. It seems that either you move from point to point in this stretched space or the stretching itself (gravity) pulls you while you are trying to mind your own business and not move. It is like you are standing on a flexible sheet (spacetime) with one foot farther from a piece of mass than the other. As space is stretched by this mass, the closer foot is now standing on a wider area of distorted space than the farther foot and tries to find the center point of this distorted space region where it was before the object appeared and both feet were on identical ground. Since the space is stretched by gravity toward the new object, your foot on that side has to slide toward it to find that center point again, but this puts it closer to the object and thus in an even more stretched region and it has to slide further, and this "chasing its tail" effect just continues until you either reach the center of the object and the force no longer has a preferred direction of pull or the surface of the object stops you from moving any more in that direction, at which point you feel your "weight". It is like somebody slowly pulling a rug out from under your feet, but on the object side, it is pulled more and your foot on that side thus has to move more to allow you to keep your balance. Since you are connected to both feet, where the faster-moving foot goes, it pulls the rest of you along with it (tidal force). This is not something that was obvious and it took Einstein to see this stuff...

[@markowegehaupt4241]

Took me a long, long time as well. 👍

[@jazzdad52]

Trying to understand……you mention the distance between 2 clocks causes this, and also the higher vs the lower clock. To say the squirrel’s head is higher than his tail, if there isn’t gravity first, how is it determined that the head is up? (higher) how do you know if the “top” of the building is away from the ground, or maybe the top is where it connects to the ground? In space, there is no up/down, unless you say that “down” is the direction that is closest to the nearest/strongest body exerting gravity. Oh yea, until it is determined which is up, there isn’t gravity yet. I say the squirrel’s head is down, the ground is up, so the squirrel will follow a curve away from the ground. Did I just discover anti-gravity?

[@BluesyBor]

This is as crazy as the channel's name suggests. if anyone need me, I'll be in my padded cell...

[@showcase-me]

I feel the same! lol

[@monkeybusiness673]

@@yonatan62 OR BOTH! O_O

[@geraldfrost4710]

People who haven't watched this video will feed you soft food with rubber spoons. Be calm, Bor, answers are coming.

[@MrUmbilical]

Yes, we understand time gradients cause “gravity”, but why does mass affect time and why is the time gradient vector from the center of the mass?

[@akxeman]

Well said. Exactly my question also.

[@dalehandski8212]

@@akxeman ok Ill guess.. Say protons are sort of excited by the presents of other energy particles and its like a magnet can move a piece of copper if its spinning or you just move it fast enough over the copper.. I believe that this effect is how it works.. light is a form of electromagnetic radiation. X Rays and many others are in the same class.. well what if all these, coming from where ever in every direction just flow? like the currents on the ocean.. but they are more uniform then anything in most of nature.. Some kind of uppercovaliant bond. what if mass is the copper.. But instead of being magnet vs non ferric materials its every kind of electromagnetism in ever format effecting all mass because there is an even mixture of all electromagnetic particles in any given spae at any given time.. Except for those places with strange gravity anomalies in gas clouds and so forth.. So how could we effect the space time our selves.. We have xray machines we can manipulate photons.. Etc. So how do we begin to identify the useful electromagnetism and drop the caveman rockets and get this intergalactic party started..

[@weezer1109]

That’s because gravity is the result of mass bending space. This guy is coo-coo for Cocoa Puffs. He explains gravity with circular reasoning and then doesn’t recognize that mass is the driver!

[@dalehandski8212]

@@weezer1109 you are kinda saying whay i am saying but with no work shown. you cant just make statements and not explain why you think that way.;. but yes i agree with your general statement..

[@Johennessy]

its just like the egg or chicken question. The mass will always be there where the the time diferrence will apear just like the other way around. So there are still a lot more questions to solve. I love the time perspective to explain gravity thou.

[@upandatom]

loved the video Nick! you're doing so well :)

[@ScienceAsylum]

Thanks Jade! I'm really proud of this one. I've been in a funk the last month or two and I feel like this brought me out of it.

[@puneetacademy8073]

Can anyone tell me that why the above clock takes more time to catch a photon?? At first he said that let us assume photon is receiving by above clock in each second..but later he said that because time is different at different places so he took 1.00000000001 seconds .. Why time increases?? Speed of photon is same always... Hope you clear my doubt

[@tforsell]

@@puneetacademy8073 Would it be more easy to imagine, if I say that the top clock clicks two seconds in the same time as the bottom clock clicks one; now when the bottom clock sends a photon every 1 second, the top clock gets them every 2 seconds. Would that explain why "the time increases"?

[@peterstokes3978]

@@ScienceAsylum, Newton made an incorrect assumption when he thought that matter attracts matter. Gravity can better be explained when another assumption is made: I hold that the correct assumption is that matter and space (what ever that is) are mutually repellent. A body of matter like a planet for example, repels or displaces the space (spacial field) around it. The repelled space in turn reacts on the matter that repelled it and forms it into a coherent sphere. If a body of matter with it's displaced spacial field comes within the influence of another body with it's displaced spacial field, then the two fields will tend to combine to attain a single displaced spacial field, such that the combined resultant force on the two bodies will bring the two bodies together. (Unless their angle and speeds are such that they either orbit each other, or veer off at an angle.) If the two bodies come together, they coalesce into one body with a greater mass, and also therefore a greater displaced spacial field. The two displaced fields now act as one. This now larger newly combined displaced spacial field, (like all displaced spacial fields), would tend to collapse to the neutral steady state of space without any material body present but, in the presence of a body of matter, a state of mutual repulsion occurs, which is the force of 'gravity'. Ones own body weight is determined by the mass of the body you stand on, and therefore it's displaced spacial field, which is combined with your own locally displaced field due to your own body mass. The two fields now act towards the common centre of displacement, which is equal the the centre of combined mass. You're welcome.

[@puneetacademy8073]

@@tforsell yeah... i got it.. thanks:)

[@yessumify]

This was wonderful. Very eye-opening. I'm glad to have found your channel.

[@jamestheotherone742]

This is probably the best lay-person's explanation of time dilation theory of gravitation I've ever seen. Bravo. All hail the sqeuerrerl of time !

[@latheofheaven1017]

It 'falls down' at the first hurdle though, because squirrels never fall. They're too fast, skilled and athletic. It is known. (Yes. It is known).

[@timhallas4275]

@@latheofheaven1017 Everyone knows that gravity does not effect squirrels. They are exempt.

[@johnburnham6239]

@James the Other One I watched a similar illustration of how time dilation causes gravity on another youtube channel... I don’t really get it though, can you help explain maybe? I’m having a hard time seeing why the squirrel doesn’t just keep stretching in the time direction, no rotation or motion in space needed. Motion of one of a rigid body’s parts in space will take the others with it, but we never had to also assume that a motion in the completely space-independent axis of time would drag spatial parts along with it...

[@CCumva]

Insane, this channel is insane... I have this kind of revelation uncovering before my eyes feeling only in 3 cases: - I study really hard and eventually something becomes intuitive (calculus was my love in University), - I'm high and talking to my friend about some deep stuff, - I'm watching this channel

[@fernandoroque]

Nick my man get us high on knowledge bro

[@guidodurante9495]

This is the final video I needed to scratch that itch about "what is gravity if it's not a force and What causes gravity, directly". I know these are all models, but now I finally get them!

[@kislaysinghgaurav168]

Dear Lucid, did u really attain those GTR Classes? The way you explain suggest otherwise.

[@ScienceAsylum]

What do you mean? I have a graduate degree in physics and my thesis was on how to apply general relativity to white dwarf stars. I've been studying gravity for a long time.

[@rhmdrhmd-i5i]

@@ScienceAsylum 11

[@davidkennedy6184]

This video blew my mind and opened it at the same time. As soon as I watched it I literally jumped straight out the bath and told my kids about the new (to me) revelation. They just stared right through me but I hope they got at least a bit of a buzz for physics, maths or just learning stuff.

[@vincequinby7013]

They were probably staring right through you because you jumped out of the bath. Next time put some clothes on first.

[@tdoyr]

Do you believe in “gravity”?

[@brawnstein]

So why is there a need to unify the 4 "forces" if we can treat Gravity as not a "forces" ? P.S. at 7:32 "Electrons do not orbit, electrons do not spin. We don't know where they are, we don't know where they have been." - Nick Lucid

[@ScienceAsylum]

As physicists, we would prefer that everything work within the same model. Gravity is currently an outlier.

[@das_it_mane]

The Science Asylum what's the reason for that preference?

[@ututut77]

as others have said, this is the first time that i actually really grasped einstein’s description of gravity. it just clicked once i watched this! thanks so much man! i love your content!

[@timhallas4275]

warped space is an abstract visual aid that does not explain gravity any more than the trampoline and bowling ball does.

[@johnburnham6239]

@Andy Isaac I watched a similar illustration of how time dilation causes gravity on another youtube channel... I don’t really get it though, can you help explain maybe? I’m having a hard time seeing why the squirrel doesn’t just keep stretching in the time direction, no rotation or motion in space needed. Motion of one of a rigid body’s parts in space will take the others with it, but we never had to also assume that a motion in the completely space-independent axis of time would drag spatial parts along with it.

[@bradleycroteau918]

Cool, I think I buy it. How long has this been understood, and why are some physicists still looking for gravitons and pulling or pushing gravitational mechanisms? If this is the case then doesn't it bridge the gap between GR and quantum gravity? Deeper questions, how does the higgs particle impart mass to other particles/larger aggregate objects, and how does mass warp space-time at a distance from the massive object?