General Relativity Explained in 7 Levels of Difficulty

[@renerpho]

To quote Enrico Fermi: "Having listened to your lecture I am still confused. But on a higher level."

[@yeahminecraft1627]

Man, if that quote doesn't describe my 400 level physics classes so well.

[@HeadCannonPrime]

This captures my feeling precisely.

[@portobellomushroom5764]

That's pretty much all learning though, just increasing the level you're confused at until you're the most confused one in the world

[@YoshisaurUnderscore]

@@portobellomushroom5764 At that point, you're so confused that the only way for you to be not confused is to make new discoveries in your field.

[@ericeaton2386]

@@YoshisaurUnderscore I think you mean the only way to be confused in new and interesting ways is to make new discoveries in your field.

[@VVilliamMinerva]

You know it's going to get serious when you're on 7 and the video is only half over

[@Anvilshock]

Though, most of the latter part is sponsor fluffing these days anyways, so, it's not really that more serious.

[@reisanibal1]

Or... there are a lot of ads.

[@christopherswanson5849]

not to mention he was like "ima speak a little slower now"

[@BullocK1495]

It got serious for me at stage 4. I get inertia, I get the whole 'ball in the middle of a sheet' example, and I get that time is a series of snap shots, but WHY any of that stuff happens is totally beyond me.

[@ivoryas1696]

Hunter Humphrey Serious = good in this case.

[@moretto6575]

"general relativity is a physics theory created by Albert Einstein" Me: hold on smart guy, take it easy.

[@truebluekit]

I must agree.

[@ivoryas1696]

Gui Let's start simpler... a squared plus b squared equals c-squared.

[@fynexjeralt4186]

@@ivoryas1696 woah there, shapes? i thought this was physics

[@ivoryas1696]

@@fynexjeralt4186 Lmao, that's low-key how I felt entering Pre-calc 😂🤔😐

[@JayronWhitehaus]

Hahahahahahahahahahaha 😂

[@gman21xx]

3:20 is my favorite part because I love how he lists off the numerous observations that validate the model. It's the observations that make this a physics theory instead of just mathematics.

[@colinkennedy1718]

2:22 "Oh that isn't too bad" 2:24 "Oh it's actually 10 equations, ok" 2:25 "Oh god oh f*ck"

[@mbrusyda9437]

Even the 2:25 is still the shortened form...

[@DannySullivanMusic]

hahaha man best comment ever

[@prodbytukoo]

10 non-linear partial differential equations, I mean, good luck man

[@veritasium]

Thanks for recommending Vitamania Henry!

[@Zeegoku1007]

Sup my brotha 😂

[@fastyfoxy]

BRO I LOVE YOU TWO GUYS

[@davidmin3583]

The check mark looks so suspicious I was about to report this account

[@Spiros219]

Hey Derek, would you like to make a video explaining the differences between making curiositystream, KZbin originals and casual veritasium videos

[@stevenalexander6262]

I was here

[@janmelantu7490]

7 levels, in 6 minutes. Less than a minute per level. Truly living up to the name “minutephysics”

[@jasonlast7091]

That's cool but also level 7 was about half of the video (2:58)

[@ivoryas1696]

jan Melantu "It's what I do."

[@StratosFair]

0:06 : What you study in class 1:53 : What you get for homework 4:30 : The exam

[@sravanboi4205]

I can certify your comment. Its accurate

[@peppatheoof]

"You went over it briefly 3 years ago, so now in this class we only review it"

[@morthostalisint1720]

This is, indeed, correct.

[@-x-3694]

This comment has to be pinned 😂

[@wellshit9489]

Its in the small text on the side that they never tell you to read or acknowledge at all in my experience

[@kummer45]

I've been studying this for years. This is by far one of the most accurate videos on the field. Level seven is the strict construction of the equations and their solution throughout classical differential geometry, tensor calculus, complex analysis, linear algebra, ordinary differential equations, partial differential equations and special functions among the classical fields. This is simply a compendium of what this is in its entirety. This is the field of Riemann Manifolds.

[@Sid-dm3sq]

Trying to explain relativity to me In 7 levels In 6 minute video At 5 in the morning In 4 walled room In 3 dimensional world On 2 dimensional screen And in 1 dimensional BRAIN NICE TRY👍

[@TheBlueWizzrobe]

*In 4 dimensional world

[@sahilkate1061]

@@TheBlueWizzrobe 3d +1 world

[@nothing9220]

With 0% knowledge of nothing

[@TheShamansQuestion]

@@nothing9220 no knowledge of nothing = knowledge of everything = infinity sounds great!

[@user-rc8bb7yb1e]

p

[@mmukulkhedekar4752]

my two brain cells have been stuck on level 2 since past 5 years

[@guitargodthor2]

Lol You'll get it.

[@imveryangryitsnotbutter]

@@anoushka6439 Oh, lah-di-dah, look at you with your extra smart brain cell that can do twice the work of normal brain cells.

[@rishigupta9671]

man! you got the same image as mine! yes i am a kid

[@I_am_Allan]

My brain cell went "kablooy" 🤯

[@themasterofbulluk2413]

glad rest of them made it through

[@desert123100]

The algorithm has not been kind to your channel, this is the first of your videos that has popped up for me in probably a year.

[@Ansh77K]

@Pinco Palla yep that explains many things

[@leeroy265]

Understanding you tube algorithms in 7 steps.... . . . . . . . NO CHANCE

[@pronounjow]

@@leeroy265 TRENDING

[@floop1108]

Then subscribe, and get all the notifications. Win-win, for you and henry.

[@edawgrules]

This is the kind of stuff that originally bothered me about science: that you have to keep coming back to a topic in order to learn the next stage as your level of understanding increased. Now, as a biology teacher, it is one of the things that makes science, and learning in general, fun. "Remember how you learned in middle school that plants make energy from sunlight? Well it's actually more complicated than that." "Remember how you learned in high school that plants make monosaccharides from sunlight? Well it's actually more complicated than that."

[@Cosmalano]

I take the view that this is because everything in science is an approximation. The approximations get more accurate, Newtonian gravity, general relativity, whatever quantum gravity might be, etc. but they never become statements about the state of being of nature. Only nature itself a knows how nature is. And science merely concerns what we can say about nature.

[@adnanchinisi7871]

@@Cosmalano completely agree with your statement about us never knowing the absolute truth/ exact way something works. Personally, I would switch "nature" for "God" but to each their own.

[@tattwa1]

@@adnanchinisi7871 God? lol

[@cecilbrisley5185]

@@tattwa1 Aw c'mon. God is just the standard thing we stuff in all the gaps of our knowledge. Each time we learn something new, we yank the god out of that gap and stuff it into the next.

[@CArnoldi1]

@@Cosmalano This is also one of the core tenets of Kants philosophy. en.wikipedia.org/wiki/Transcendental_idealism

[@einstein4all]

Words cannot express your talent and I'm so grateful. Thank you for all these insights and inspiration. It took me ~1000 hours to produce 17 hours of video explaining Special Relativity in just 3 levels of complexity …

[@beverlymarsh9325]

It is so confusing that me, my future and past self gathered together yet couldn't understand anything

[@divishatewari7612]

🤣😂same 😅

[@angga2oioi]

The time I spent watching pbs spacetime did not goes to waste. I manage to nod at the explanation up to level 3. 🎉🎉🎉

[@carloshernandezperez6963]

I felt that.

[@l1mbo69]

@Charles Clarke bruh that's literally just a full course on GR

[@l1mbo69]

@Charles Clarke actually I do know about the ScienceClic YT channel, and yeah it's great! Just the perfect level for me

[@mace1234]

Omg I love spacetime! I didn’t realize it was so popular

[@wyatttomlinson3475]

I understand Level 6.5 stuff. But wait...THERE'S MORE! That's why I love physics!

[@davidbarnett8617]

The image of the black hole was not from the center of the Milky Way but rather from data collected observing the galaxy M87.

[@TroyEagan]

I came here to say this.

[@MichaelLesterClockwork]

I came here to say exactly that... #copypaste "One of the largest known supermassive black holes, M87* is located at the center of the gargantuan elliptical galaxy Messier 87, or M87, 53 million light-years (318 quintillion miles) away." Sagitarrius A* is the one in the middle of the Milky Way, it is about 20,000 light years away, but obscured by all the dust in between.

[@grantweldon6507]

Also was going to say this. Worth nothing that GR has been tested by other groups using the orbits of stars around Sagittarius A*

[@capitalm417]

He corrected that in the video. 3:42

[@portobellomushroom5764]

I made the same mistake myself when mentioning the 2020 nobel prize in physics and the 2019 photographed black hole

[@Alessandro_Nicotra]

Here I am finishing my Master Thesis on a Loop Quantum Gravity topic and trying to write a nice overview of what have brought us this far. This video is so perfect now I want to put the link to it in my thesis instead of writing chapter 1. Great work.

[@Rickrolledhey]

Hey I have some doubts about lqg . Can I ask you ?

[@Alessandro_Nicotra]

@@Rickrolledhey Sure :)

[@smugface9955]

It’s been two years since this comment, but I’m curious to hear more from someone who has worked under a master’s program. To be frank, I’m a mathematician so sometimes I jump to the mathematical properties of these theories rather then the physical. Having glossed over a few papers on LQG, my sense is that the quantization of space challenges the Reimannian geometry of GR in a controversial way? At the end of the day, these theories come down to their predictive qualities (last I heard there were promising but inconclusive findings from gamma-ray bursts)… what’s the story on LQG today? Is it still alive and kicking?

[@gregorykafanelis5093]

I leave this comment because I wanna hear his response

[@Pyrcae]

Danke!

[@dreadnoughtus2598]

3:42 That's not the black hole at the centre of the Milkyway. It literally says M87 on the picture!

[@Alpinwolf5]

YEP. Came looking for this comment. (Tho MinutePhysics still does a great job!) "Further reading": M87* is the SMBH at the middle of the Virgo A galaxy (a.k.a. M87). Our own SMBH in the Milky Way is Sagittarius A*. And the "star" part is important to the name - one does not simply leave it off.

[@dreadnoughtus2598]

@@Alpinwolf5 so does that mean you do agree with me

[@Alpinwolf5]

@@dreadnoughtus2598 yeah, totally! I only added more detail for other passing readers. :)

[@dreadnoughtus2598]

@@Alpinwolf5 thanks for your support in this matter. It is greatly appreciated.

[@dreadnoughtus2598]

@@connorgolsong290 which was.......?

[@daviddavis4885]

Level 14 of General Relativity: Obtaining a PhD in Theoretical Physics

[@aryamanmishra154]

Not neccesarily. Anyone with a class in GR can understand most of it. PhD in Theoretical Physics is much more sophisticated it develops on already developed GR and Quantum fields theory for example trying to develop parts of string theory.

[@qazwerty41339]

I have a theoretical degree in physics

[@denverbeek]

@@qazwerty41339 I have a physics in theoretical degree.

[@ishworshrestha3559]

Nicee

[@dhirendrasingh2513]

@@denverbeek I have theoretical in degree physics

[@blackpete]

Level -1: falling Apple + head = ouch.

[@Epilogue_04]

Newton level: fallin apple + head = gravitational universal law

[@blackpete]

@@Epilogue_04 Oh, what's Steven hawking Level then?

[@pclouds]

I like this level. And I'm hungry.

[@isaacnewton7424]

Lol

[@WaveOfDestiny]

Level -1.5 ground = good Not ground = ouch

[@FarhanHafizh]

Level 3: Okay, kinda get the main idea Level 4: ｗｈａｔ

[@dillon1012]

Not liked because number 69 likes

[@user-rc8bb7yb1e]

really

[@parahumour4619]

@@user-rc8bb7yb1e dude you have a cool name

[@dsdy1205]

Just ignore the word salad and listen to the stuff he says after that, it makes more sense; I feel he shouldn't have led with the proper scientific name

[@ballin1006]

@@dsdy1205 Ikr but now I can show off to everyone by knowledge of a pseudo-riemannian manifold is

[@EliasDam]

This is a brilliant idea! To present such an advanced subject in different levels next to each other, it really makes it easier to follow

[@jannesvanquaillie9151]

This was SOOOOOO good! Hearing all the explanation after one another really helped me to understand it! It's also kind of funny when you realise that level 1-6 is only the first half of the video XD.

[@triteraerlangga7917]

and here I am trying to pretend that I understand

[@michaelterrell5061]

I j ow you’re joking but understanding is the easy part. The mathematics behind it is the hard parts, but as with anything practice makes perfect.

[@seanleith5312]

You don't invent a theory, do you?

[@lonestarr1490]

Fake it until you make it

[@real_nosferatu]

And here i am, trying to pretend that i relate to you.

[@karigucio]

this video makes you feel like it is explaining something, that you are just not getting. It is not honest in this matter. You're not supposed to understand what a Riemannian manifold is by hearing the term, don't feel bad about it.

[@mariovanderwal1695]

I'm level 7 for things that I know. I'm level 0 for things that I understand.

[@badmintongo4832]

Ricci tensors, curvature scalars, antisymmetric tensor fields, Grassmann variables, Christoffel coefficients, diffeomorphism invariance, isotropic pressure in vacuum states with cosmological energy densities, nonlinearity distinguishment from e.g. Schrodinger's equation and Levi-Civita symbols.

[@TheShamansQuestion]

Is it weird that I'm the exact opposite: Level 0 for things that I know; Level 7 for things that I understand?

[@srajanverma9064]

@@TheShamansQuestion He wants to understand the things which he doesn't understand while neglecting the others. You want to understand the things you already understand but in as much more depth as possible while neglecting others..

[@TheShamansQuestion]

@@srajanverma9064 very nice 👌🏻 you're right my want is there but I'd de-emphasise "want" and say it's more once I get knowledge, I can understand it deeply (and because I want to/go for depth), plus a sceptical, Socratic element of "I know that I know nothing" (but that is probably more relevant to "understanding" in this case, so might be wrong on that)

[@jibbs_aim]

You just summed up physics

[@imdadood5705]

Okay, time to change my LinkedIn description to “Physicist specialized in General Relativity”

[@mastershooter64]

same, I changed it to, "having a theoretical degree in physics"

[@sirdurtle9519]

I went into this video thinking, oh, that's cool, he'll explain it in incrementally more complicated ways so I'll be able to understand it by the end! Me at difficulty 2: huh

[@neillibertine3044]

Basic tenets of natural philosophy are; 1. Law of entropy is fundamental law and it is unification of gravotational force, electric force, black-body radiation law, divergence law, law of motion, structure of fundamental elements. 2. General theory of relativity and Quantum mechanics are description of phenomenon without entropy or no loss or perpetual motion. They are same and there is no need of reconcilation of these theories. 3. Phenomenon are in classical domain, general theory of relativity and quantum mechanics are ideal case and thus not observable. Theory of relativity needs many assumptions which are contradictory or unprovable thus false theory. 4. There are no two types of charge like two types of matter which arises when one solve Laplace's equation, field without source but that lacks time component. In nature only force without energy loss is magnetic force. There is electric force but it like thermodynamic pressure eventually die out. 5. Entropy is decaying of force or ceasing motion. Only way to counter entropy is cyclic or periodic motion that negate volume expansion and restore system but introduce temporal component, frequency. More the frequency more the entropy. 6. Without force there is no continue motion, mechanical force is due to heat and electric due to charge. Conservation of energy is not correct but equality of power as it is product of force applied and rate. Both force and rate can increase entropy but in cyclic only rate.

[@IForgetYourName]

Having solved the Einstein Field Equations for a physics final in college, fuck. That is all.

[@abelnolan9378]

what topics do you go over before learning about Einstein's field equations?

[@jiagengliu]

@@abelnolan9378 differential geometry and differential equations, I believe

[@underfilho]

@@abelnolan9378 differential geometry, you will need tensors too, and a bit of classical mechanics and differential equations

[@northernskies86]

It takes at least a few hours to derive even the simplest solution (Schwarzschild solution) to the EFE by hand. A set of 10 highly coupled nonlinear differential equations makes even the most brilliant mathematicians cringe.

[@rtg_onefourtwoeightfiveseven]

I once had a professor that said "Everyone should curl up with a warm drink and spend an evening deriving the Einstein Tensor for the FLRW metric by hand at some point in their life". Needless to say, I haven't done that yet.

[@matrixmodexp]

I am very glad he mentioned that GR is incomplete

[@MorgurEdits]

I guess that should still not be the main take away from the video.

[@ngiorgos]

When you're one of the most successful theories in the history of physics, but people only mention you to explain how you can't answer questions you weren't made to answer. It baffles me that educators always do that when they talk about GR (but not as much with Quantum Mechanics). 99.99% of the people don't know these theories when they do apply. Why are we so fixed on the cases they don't apply? Edit: I'm not saying to ignore the gap in our therories or that it is not important or interesting. I just meant to say that when first learning about relativity it's no use focusing TOO much of your attention there from the beggining. It's a great goal to work towards solving those mysteries. But realistically, you can't do much before you learn GR properly. Be informed about it and use it as a motivation to learn GR. You'll get there when you get there. And if you're already there, you're awsome! ;D

[@chrispitterle8831]

@@ngiorgos When I hear that quantum mechanics and GR still need more work to make the 2 compatible, I feel excited. It tells me that there is more to discover. It helps teach that science is in fluctuation. It changes and improves. There are questions left to solve and WE could be the ones to solve it.

[@ireallyhatemakingupnamesfo1758]

@@ngiorgos every scientific theory from over 200ish years ago has been proven wrong one by one, our current theories are more right in more circumstances, but they're still wrong. In another 200 years we'll look back on some of this stuff the way we do phlogiston or the luminous aether. General relativity is the best tool we have to understand spacetime, but it'll be replaced eventually by something even more accurate!!

[@freeman7079]

anyone else think this was Music is Win?

[@tonydai782]

3:42 The image is of the black hole at the centre of M87, not the Milky Way, hence the picture being labelled M87* instead of Sagittarius A*

[@crackedemerald4930]

I think they tried imaging it too but there's a bunch of junk in the way and they're about the same angular size so yea.

[@liamchisari2191]

Came to the comments looking for this, glad I'm not the only one who noticed that it's M87 and not Sagittarius A star

[@mh6276]

We did manage to image that one too eventually.

[@deadoira]

05:09 „It is very high-level stuff“ Our math teacher when creating the tests: „Haha what did you say? Pathetic.“

[@wellshit9489]

I like your quotation marks

[@deadoira]

@@wellshit9489 I'm Russian so it explains everything

[@wellshit9489]

@@deadoira I wasn't being sarcastic dw, we have them in Iceland where I live too

[@deadoira]

@@wellshit9489 I know, just decided to explain :)

[@swastikmajumder9483]

Nobody literally nobody: 1st year Physics Undergraduates:I'm gonna unite GR&QM

[@yashkrishnatery9082]

I'm also a first year physics UG currently at hansraj college. Delhi university Which college you are from

[@pulkitmohta8964]

@Swastik Majumder nice! I also want to get into an IISER. I am going to give the entrance exam this year (again, as I didn't clear it last year), and I hope to get into an IISER!

[@pulkitmohta8964]

@@yashkrishnatery9082 what are you studying there?

[@yashkrishnatery9082]

@@pulkitmohta8964 I'm preparing for JEE Last year I qualified both exams but didn't took admission as I didn't got rank under 2000 I didn't took any formal coaching last time so I dropped and preparing

[@yashkrishnatery9082]

@@pulkitmohta8964 at hansraj I'm studying nothing. I'm just focusing on JEE. I just took admission there as I was getting in almost all DU colleges

[@kennylex]

This is the ultimate video to confuse flat-earthers even more :-D

[@DanielBrown-ob3dr]

and round-earthers too

[@yannickchayer1609]

I had a discussion with a friend who's into conspiracy stuff, for shits and giggles mostly mind you, about how in a very special way, yes, you can say that the earth is flat. Twas a fun talk haha

[@Yora21]

No. Flat earthers are immune to facts.

[@TheReligiousAtheists]

You thought the *Earth* is flat?! Well guess what, even space and time aren't flat!

[@bobkreme2175]

still stomping on those ants? lol

[@Pandaemoni]

3:44 That is NOT "the black hole at the center of the Milky Way" (Sagittarius A*) that is the black hole at the center of galaxy M87. They did consider imaging Sagittarius A*, but that was ultimately not their target. Edit: It turns out I do not know how to spell "Sagittarius."

[@GrayLynch]

That’s what you got out of this?

[@Pandaemoni]

​@@GrayLynch No, that is a correction to a mistake they made in the video. In no way did I suggest that the video wasn't worth watching or is otherwise "ruined" as a result of their mistake; but if it were me and I made a mistake in a science education video, I would hope I would be corrected.

[@hrgwea]

I immediately noticed that error as well.

[@alwaysdisputin9930]

Yeah but fan fuct: we do orbit the M87 black hole

[@pookispooks6968]

@@alwaysdisputin9930 have you got a source on that?

[@gasdive]

So good. I've tried so many times to explain the way the ground pushes you away from a straight line and I've never once passed understanding across. Now I can link to this video with the clear diagram, and maybe in future, I'll succeed in showing the beauty of this idea to others.

[@staliniumprojectile]

This is actually the best summary video I've ever seen on physics.

[@vaedkamat484]

I like that you include geodesics, a major step in my learning.

[@rikhilnell2623]

Remember when math and physics had numbers? .... yeah me neither

[@kingplunger1]

indices !

[@FranciT98]

I'm firmly convinced taking a maths/physics course is about the most roundabout way of learning the greek alphabet.

[@williamromero-auila921]

I think I saw an 8 somewhere in the video, but it might have been an illusion

[@calvindang7291]

@@FranciT98 Hey, you do learn it pretty quickly.

[@ngiorgos]

Non-mathematicians: wait, it's not about the numbers? Me: never has been (points gun)

[@skatheo2716]

the funny thing is, he's only explaining it for those who already know.

[@ngiorgos]

I wish it was possible to explain it for the ones who didn't know. I wish that every day

[@ivoryas1696]

Skatheo Well beyond around level 4, yeah, but it's seems pretty okay otherwise.

[@TheBlueWizzrobe]

@@ngiorgos I think Vsauce's "Which way is down" video does a pretty good job. It gets more obtuse near the end and doesn't even get as high-level as this, but I like it a lot.

[@ngiorgos]

@@TheBlueWizzrobe Yes, I loved that! And Veritasium's video "why gravity is not a force" is also an excellent presentation. But the best they can do is give an overview of the theory and some intuitive explanations. The maths are still untouchable, unfortunately.

[@iankelley9302]

I got to around level 5, then level 6 I only knew some of it.

[@ThierryTiramisu]

1:20 that's a nice globe you got there. Me, an intellectual: actually, it's a pseudo-Riemannian manifold with Lorentzian signature,... But thank you! 😊

[@isaackay5887]

..out of all of them......this made me laugh the most. Well done 😂

[@badmintongo4832]

Nondegenerate symmetric metric tensor too. Establish the linear connection/Levi-Civita connection with use of Weyl spinors (helicity operators).

[@ivoryas1696]

Dave P _IQ +10_

[@albertmendoza8330]

Just finished taking general relativity this quarter that passed, and I can honestly say that this is the hardest topic I've seen so far in my physics career, but also the most enjoyable.

[@DanielDaniel-xz2yp]

Level 90: Discovering a mathematical notation that encapsulates both General relativity and Quantum mechanics and winning the nobel prize

[@minutodefisica]

👀

[@ToeMunchEnja]

👀

[@The360MlgNoscoper]

👀

[@Oblivion-Dude]

👀

[@skchafe9310]

👀

[@jacksonmorton4915]

👀

[@Cosmalano]

Great video. Your videos got me interested in general relativity six years ago, and to this day I’m still trying to become a mathematical physicist so I can study quantum gravity. ❤️

[@mtg_phoenix698]

The video hasn’t started yet and I’m already confused.

[@DragonKingGaav]

That's why there's this video! kzbin.info/www/bejne/raPamHygd7qMjMU

[@guitargodthor2]

Just picture space-time as water flowing towards a drain that is moving on the seabed below. Now picture the water as rainbow colors that never mix together (stripes maybe) as they flow towards the drain. Now picture the drain as a sphere. The 2D nature of its opening is the diameter and the edge is the equator. Now put a leaf anywhere in or on the water, near or far. What happens to the leaf in the different places you put it? That is space-time... with one exception... A drain sends the water somewhere else whereas space-time is fixed in place so it doesn't go anywhere. Space-time is literally pulled inward (or rather pinched) by the mass of a planet, star or blackhole as they move through it and it unpinches the farther away it gets from point A while heading to point B. Like walking on a memory foam mattress with stuff all over it. Your feet are the mass and the mattress is space-time and the stuff falls towards your feet depending on where you are on the bed.

[@Random-Access]

This the BEST video I've watched about General Relativity!!

[@Koisheep]

Finally, I knew taking a course in differential geometry would be useful someday.

[@mr2octavio]

Today we have a Rover landing and minute physics uploaded, blessed day

[@Mayank-mf7xr]

Truely.

[@farrankhawaja9856]

Wow that was very quick but so educational! Thanks so much!

[@Noah-nk3zz]

Thanks for summing all that up in a short video. I've seen a lot of videos explaining GR/SR on different "levels" and this gives me a nice feel on where I stand in my understanding of the subject.

[@PhysicsLiteracyforKids]

Thank you so much for all your work. I have used many of your physics videos for my classes. Little kids especially get a big kick out of them!

[@davecolwell725]

4:05 I finally understand how gravity works on our planet. Omg. That was the best explanation I’ve ever seen.

[@romangonzalezadrianmaurici6302]

This video: There are 7 levels of understanding gravity. Me: I can make it to level three, take it or leave it.

[@wellshit9489]

DW thats pretty good

[@aemmelpear5788]

I have been subscribed to this channel for quite some time now, I initially got interested because of my great physics teacher in high school. Back then I did not understand most of the videos at a deeper level (so the primary target audience). After 3 1/2 years of studying physics, I have my GR exam on monday and can happily say: I knew everything in this video! And it makes me glad to finally be at a point where I do understand this stuff at a deeper level. It took quite some time, but I got there. Of course I am still just beginning to be a physicist and there is MUCH I don't know yet and MUCH and I don't know that I don't know yet. And I am excited and looking forward to finding it out!

[@Lorachzwan]

Keep it up and thanks for your service to science :D

[@fischmann1746]

Same story here. Such Videos brought me to physics. According to plan, I'll have my Bachelor in half a year.

[@aemmelpear5788]

@@fischmann1746 Then I wish you best of luck for your thesis! Do you already know in what area you will write it?

[@fischmann1746]

@@aemmelpear5788 Thanks. I'll write a program that simulates a non-linear mechanical system and analyse it's behaviour. What system in precise isn't clear yet. Writing simulations in non-linear physics is pretty much the profession I want to finde myself in some day.

[@aemmelpear5788]

@@fischmann1746 Sounds great! Computational Physics is also one of my favorite areas!

[@squished1879]

"very high level stuff" - like nobody has figured out how to do it yet

[@brickssolved5367]

I love how equivalence principle is added in the subtitles.

[@benharvey8094]

As a physics major heading into my sophomore year, the feeling I get watching this video is roughly akin to the feeling I get at the top of the first hill on a roller coaster as I stare down the straight-vertical track…

[@calebkulfan2190]

i'm gonna start calling the 90s the "nowdays"

[@kennarajora6532]

I don't get it.

[@dinamosflams]

@@kennarajora6532 .

[@metametodo]

@@kennarajora6532 check the graph at 4:46

[@kennarajora6532]

@@metametodo oh alright, thanks.

[@Guztav1337]

You got a too short of a time scale if you don't think of it as nowadays.

[@JesseRon]

Videos like this remind me of why I love physics.

[@dontuserachelslurs]

It's not a question of "when? " my dear Reggie, but "where?"

[@ewutermohlen]

It's the same thing with the concept of spacetime

[@tanmaydeshmukh3517]

No no both when n where n how much

[@Think_Inc]

It’s about whenere/ wheren.

[@shadesilverwing0]

Metaphysics: it's not a question of "what?" my dear Reggie, but "why?"

[@SchmySeymour]

I've been a Nebula subscriber for at least a year and I've never seen Minutephysics mentioned on the site under you said to go looking for it.

[@jojoviviator9258]

Cool concept for a video. I especially enjoyed the "level 1 again" explanation of people's personal experience of gravity on earth in terms of your GR explanation.

[@misakamikoto8785]

What is General Relativity? Level 0 answer: "posts this youtube link"

[@anubhavsrivastava1471]

Loved the level 0, something Einstein did 😂😂

[@badmintongo4832]

Ricci tensors, curvature scalars, antisymmetric tensor fields, Grassmann variables, Christoffel coefficients, diffeomorphism invariance, isotropic pressure in vacuum states with cosmological energy densities, pseudo-Riemannian manifolds, nonlinearity distinguishment from e.g. Schrodinger's equation and Levi-Civita symbols.

[@greentau]

M87 is not at the center of the Milky Way! It’s in another galaxy about 50 million lightyears away.

[@stef10ziggy]

This totally helped me understand. Great concept.

[@pablodavidclavijo4609]

I love the jazz music stops vibe given by having jazz music literally stopping

[@mingminggg]

I literally have to do a research paper on general relativity, thanks so much.

[@Sulcuryalt_Inone]

Getting to level 5: "Oh Jesus".

[@michaelmckinney3507]

I have just discovered your vids and they are unreal! The fast pace really suits hows racy my minds works its great 😁👍

[@connorcozart5830]

This is the best thing I have ever seen.

[@emirhanulas4281]

I have been trying to understand it for a long time and this video put everything that I have found in a correct order and now I finally did understand it. AMAZING

[@hamiltonianpathondodecahed5236]

not even kidding, just revisited special relativity series a few minutes ago

[@leanderhulzebosch2047]

Mass tells spacetime how to curve, and spacetime tells mass how to move

[@kennarajora6532]

John Wheeler said that.

[@Mayank-mf7xr]

I have heard this so much in my career and it excites me every single time.

[@Hi-Im-RubX]

Excuse me sir. I do believe it closer to something like: "spacetime tells matter how to move matter tells spacetime how to curve" Good day to you.

[@Pegaroo_]

3:42 that is not the black hole at the centre of the milky way that is M87 and is about 55 million light-years away from earth

[@barba5209]

‘I’ll make you confused and make your brain melt at 7 levels in increasing levels’

[@yashb713]

Isn’t the black hole image from M87?

[@eduardonegrao8364]

It is, I think he was just trying to represent black holes in general

[@audience2]

@@eduardonegrao8364 He said "direct imagining of the black hole at the centre of the Milky Way".

[@nrs8043]

I was sad to see that after all these years of studying I still can only explain the concept to others as level 2-3

[@cloudycloudi631]

And this is why things get so specialized as you get higher in education. Monke brain no good at figuring everything out. Maybe one small thing, and have to spend a lifetime on it.

[@lookingglassknight139]

This is amazing. I love seeing high level knowledge explained quick. I’ve had this idea for a while about predicting the future with all the variables of today. Ultimately it comes back the is anything actually random and to that quantum mechanics says yes

[@aminelabidi6113]

SOOOOOOOOO BEAUTIFUL..! thanks man.. Best explaining ever ♥

[@sgreekcrown]

Listening to this at .25 and .5 speed is a delight, like listening to a stoned science major talk about their focus.

[@huski1]

3:41 *black hole of a distant galaxy

[@partyzahn7312]

Thanks!

[@dhirendrasingh2513]

"So if you combine both quantum theory and general relativity,you get Nobel Prize."🙄

[@Joyexer]

3:41 This is the Black Hole in M87 tho...

[@00Linares00]

Yeah, it is in another galaxy

[@srgtcolon1493]

Yep. Our Sagittarius A* has similar apparent size (1500x smaller, 2000x closer), but M87* is easier to image, more active and the Milky Way is not photobombing it.

[@Joyexer]

@@srgtcolon1493 Nice one. I didnt know about these details. And remember: Photobombing isnt cool guys! At least in science. xD

[@stankfaust814]

Cool Video It's pretty simple to illustrate that standing motionless on the surface of the earth, your "straightest line through space time" runs through the top of your head, out your feet and straight to the center of the core. The 'weight' you feel is your body being in constant deceleration from its fall being blocked by all the matter beneath your feet. Another interesting thing about general relativity; if you put a clock on the surface and one at the core, the clock at the core would run more slowly as it is at the deepest part of the gravity well. For a body in rotation, like the earth, this variance in clock time produces a core which tears free of the surrounding strata and spins ahead. We call it a 'super rotating core' and it's what produces our electromagnetic field. It's General Relativistic Acceleration in the spin direction.

[@healthandfitness-m1r]

You are so blessed to understand these things.

[@NihilistEmier]

Guess who's back , back again ...

[@Maximumconfort-m6w]

Me: listening to this 🥴 Morty: now you know how I feel

[@FlorianHWave]

So would combining general relativity and quantum mechanics get us the world formula?

[@ther701]

T H E O R Y O F E V E R Y T H I N G

[@hussnainsamee2603]

it will give us our world seed.

[@gp.gonzales]

ScienceClic is an underrated channel that you should collaborate with.

[@kashif1196]

This video is a masterpiece.

[@ectosy]

maybe another species of intelligent life already 4 parallel universes ahead of us, humans.

[@tomsmith6878]

4:48 'Nowadays' ends at 1997, wonder when the next breakthrough will b e

[@killianoshaughnessy1174]

Me: Of course, it makes sense now. I don't know jack shit.

[@4u2nvinmtl]

@0:44 gravity is curved spacetime (not caused by it). Gravity and Spacetime Curvature are basically the same and seem to be used interchangeably. The real cause of the spacetime curvature (aka gravity) is Mass/Energy localized in a specific place and time.

[@Chuck_Blaze]

this one was a true minute physics for me because i was only following you for the first 60 seconds

[@saurabhrana4160]

Anybody like me who does not know difference in general and special relativity 😂😂

[@aaronwtr1150]

The main difference boils down to that in special relativity, we disregard gravity and in general relativity we take gravity into account

[@aaronwtr1150]

This is the same as saying in special relativity we study flat space-time while in general relativity we study curved space-time. As you might know, we can model gravity by considering curved space-time.

[@bobsamuri7173]

Special relativity is for comparing things that are not accelerating with respect to one another. General relativity includes both cases.

[@WARRIOR-bq4bn]

Its the same thing

[@WARRIOR-bq4bn]

Somewhat