The Speed of Light is NOT About Light

[@allT1mec0psAreBad]

I like that this guy always takes a wide, athletic stance to explain physics

[@gandalf8216]

When you spit facts, you can't just go full rhetorical, meaning as an educational presenter spitting facts you'll have to use body language for the tonal communication.

[@InnocenceExperience]

Like Ronaldo taking a free kick.

[@HolyGuacamolean]

Not that it matters one way or the other, but are you a gay man by chance? I can't picture a woman using the phrase "wide, athletic stance," because it's something a PE coach (or gay man) would say to describe another man's pose. But you're totally right in that observation - and now I can't not notice how wide his stance is. He looks like he's getting ready to drop a duke in a port-o-pottie.

[@chadkincham]

Physics talk requires the Kung fu HORSE stance.

[@davidna8573]

Would you call his stance. . . Physical?

[@JJs_playground]

Can you explain that thing you said about that stuff.

[@LuisSierra42]

The shit moves at maximum speed c

[@cgme7076]

😂😂😂😂

[@whatsup2310]

Only if the shit has not mass. so farts move at the speed of light?

[@huntnwabbits8150]

good question, I wondered that myself.

[@pastethat]

Whats Up If i recall correctly from my recollection of useless knowledge. When talking about the act of smelling, like a fart, were talking about the nerves in our nose is picking up particles attached to air molecules. In other words, we're smelling the air, which is not massless and travels at the speed of sound at sea level. If something requires a medium to reach you (ie smell and sound), then you already know it can't travel at light speed. And air molecules (doesn't travel in a straight line) bounces around other molecules before the scent travels to your nose, which is why there's a time delay between gas leaving underwear and you smelling a$$. Someone please correct me if I remember / described anything wrong.

[@kicapanmanis1060]

I can't believe Matt's been hosting this show for 7 years. Amazing.

[@thevuntzer]

There are 7 years of these vids? I've got some binging to do...

[@elijahlupe]

I can't believe he didn't used to have facial hair

[@projectmayhem6898]

Matt's accent has gone from Australia to London in that time.

[@williamSkipper-x6x]

​@@elijahlupe8he? Jlnñl❤q on

[@lorenzogumier7646]

This video is unique because it addresses an unspoken detail that has brought about a lot of confusion: speed of light and speed limit are often used interchangeably but in reality are separate concepts

[@bystrostrag827]

YA.THE SPEED OF LIGHT,IS THE SPEED THAT LIGHT CAN GO.LIKE THE SPEED OF SOUND,IS NOT THE FASTEST THING ON EARTH.🙂🙂🙂🙂

[@whodey2112]

I'm SO glad there's no test at the end of this video.

[@Bgrosz1]

I would just use "Lorentz Transformation" for every answer.

[@SWillis]

I'm so glad there is an end to this univ--er, video.

[@CarlAyers-x8h]

Depends on your beliefs. You may be testing now.

[@wilaustu]

This man is using the powerest of power stances.

[@Napthalicious]

I thought it did look a bit like tiger style...

[@tylerdurden3722]

Looks like an 80's pop star pose. Rick Astley or someone. Edit: Freddie Mercurie

[@Napthalicious]

@@tylerdurden3722 Ha, you said Rick Astley first! Talk about obscure. Never gonna leave you, babe...

[@Napthalicious]

@Eddie Turbine As you wish...

[@Napthalicious]

I suppose he is instead uber-famous like Eddie Raven or perhaps Eddie Rabbit? How about Edie for obscure? Enya? I know, the New Bohemians. Rick Astley was a Jordache wearing pre-George Michael wannabe with only one hit during the worst era ever to be a charting musician. A veritable nobody on the 'billboard' of history. In other words: yes, obscure...

[@krzysztofczoczynski419]

I'm binge watching this channel and I wasn't prepared to see him without a beard

[@idontwantahandlethough]

SO THAT'S WHY HE LOOKED WEIRD! lol thank you, I couldn't figure out why he looked so funny to me, it's 100% the clean shave.

[@freshtoast3879]

@@idontwantahandlethough this was filmed years ago too

[@richardthanmyself290]

He had a beard?

[@frankdimeglio8216]

@@idontwantahandlethough THE MATHEMATICAL AND PHYSICAL PROOF THAT E=MC2 IS DIMENSIONALLY CONSISTENT WITH ONE AND WHAT IS A TWO DIMENSIONAL SURFACE OR SPACE ON BALANCE, THEREBY PROVING THAT ELECTROMAGNETISM/ENERGY IS CLEARLY AND NECESSARILY PROVEN TO BE GRAVITY (ON/IN BALANCE): This also clearly proves ON balance that E=mc2 is directly taken from F=ma. Magnificent. Gravity is a property of SPACE ON BALANCE. It involves adherence or cohesion. So, BALANCED inertia/INERTIAL RESISTANCE is fundamental ON BALANCE. Accordingly, ON BALANCE, TIME is NECESSARILY possible/potential AND actual ON/IN BALANCE. Consider what is the man who IS standing on what is THE EARTH/ground (ON BALANCE). What is the blue sky ON BALANCE? This IS the blue EARTH AS this is expressed on balance WITH (or equivalently by) what is the eye. The translucent AND blue sky is consistent with what is BALANCED BODILY/VISUAL (AND electromagnetic/gravitational) EXPERIENCE ON BALANCE, as touch AND feeling BLEND; as ELECTROMAGNETISM/energy is CLEARLY (AND necessarily) proven to be gravity (ON/IN BALANCE). GREAT. The stars AND PLANETS are POINTS in the night sky ON BALANCE, AND consider what is the speed of light (c) ON BALANCE !! Consider TIME (AND time dilation) ON BALANCE. E=mc2 IS F=ma ON BALANCE, AS the rotation of WHAT IS THE MOON matches it's revolution; as ELECTROMAGNETISM/energy is CLEARLY (AND necessarily) proven to be gravity (ON/IN BALANCE). The tides are CLEARLY and necessarily proven to be electroMAGNETIC/gravitational ON BALANCE. I have also CLEARLY explained (ON BALANCE) why THE PLANETS move away very, very, very, very slightly in relation to WHAT IS THE SUN !! I have explained why WHAT IS THE EYE beholds what is then (ON BALANCE) WHAT IS THE BLUE EARTH. Notice the associated black “space” AND DOME regarding what is the eye. Again, the stars AND PLANETS are POINTS in the night sky ON BALANCE. ELECTROMAGNETISM/energy is CLEARLY AND NECESSARILY proven to be gravity (ON/IN BALANCE). Very carefully consider what is THE SUN ON BALANCE !! E=mc2 IS F=ma. Again, I have proven AND explained why the rotation of WHAT IS THE MOON matches it's revolution. Gravity cannot be shielded (or blocked) ON BALANCE. What is quantum gravity is CLEARLY fundamental ON BALANCE. Gravity is CLEARLY fundamental ON BALANCE. BALANCED inertia/INERTIAL RESISTANCE is fundamental ON BALANCE. Define “mass". You cannot. BALANCED inertia/INERTIAL RESISTANCE is fundamental. E=mc2 is taken directly from F=ma. CLEARLY, gravity AND ELECTROMAGNETISM/energy are linked AND BALANCED opposites (ON BALANCE); as the stars AND PLANETS are POINTS in the night sky !! Consider TIME (AND time dilation) ON BALANCE. GREAT. You have to CLEARLY AND fully understand what E=mc2 means and represents ON BALANCE. We want to understand the dimensions in a seamless (or balanced) fashion in relation to gravity AND ELECTROMAGNETISM/energy (including what is E=mc2). Consider one AND three dimensional SPACE ON BALANCE. Consider what is the fourth dimension ON BALANCE. NOW, consider all of the following. Consider what is E=mc2. CLEARLY, you have to understand what is a TWO dimensional surface OR SPACE ON BALANCE. c squared CLEARLY represents BALANCED acceleration in conjunction WITH what is NECESSARILY a dimension of SPACE ON BALANCE. The stars AND PLANETS are POINTS in the night sky ON BALANCE, AND consider what is the speed of light (c) ON BALANCE. This CLEARLY AND NECESSARILY represents, INVOLVES, AND DESCRIBES what is possible/potential AND actual ON/IN BALANCE. Carefully consider what is THE EYE ON BALANCE. Great. Consider what is gravity AND E=mc2 ON BALANCE. TIME dilation ULTIMATELY proves (ON BALANCE) that ELECTROMAGNETISM/energy is gravity, AS E=MC2 is CLEARLY F=ma ON BALANCE. Gravity/acceleration involves BALANCED inertia/INERTIAL RESISTANCE, AS ELECTROMAGNETISM/energy is gravity; AS E=MC2 is CLEARLY F=ma ON BALANCE; AS the stars AND PLANETS are POINTS in the night sky. Accordingly, ON BALANCE, the rotation of WHAT IS THE MOON matches it's revolution. TIME is NECESSARILY possible/potential AND actual IN BALANCE, AS ELECTROMAGNETISM/energy is gravity; AS E=MC2 is CLEARLY F=ma ON BALANCE. The stars AND PLANETS are POINTS in the night sky. Accordingly, ON BALANCE, it makes perfect sense that THE PLANETS (including WHAT IS THE EARTH) will move away very, very, very slightly in relation to what is THE SUN !!! ELECTROMAGNETISM/energy is gravity, AS E=MC2 is CLEARLY F=ma ON BALANCE. Inertia/INERTIAL RESISTANCE is proportional to (or BALANCED with/as) GRAVITATIONAL force/ENERGY, as this balances gravity AND inertia; AS E=MC2 is CLEARLY F=ma ON BALANCE; AS ELECTROMAGNETISM/energy is gravity. GREAT. By Frank DiMeglio

[@silversonic1]

I know right? With the beard, he looks like a professor. Without, he looks like a grad student. I guess he suffers from Will Riker Syndrome, aka Baby Face Disease.

[@rainmaker709]

The way that I always described c was "the speed at which a massless wave propagates in empty space." Light happens to be one of these massless waves but there are many others.

[@Beansforvavle]

This perspective is interesting to me, because I work in particle physics and would say the same thing, except I'd say massless particle instead of wave because that's the way I end up thinking about light and gravity more often.

[@damonedrington3453]

This is especially good because it’s a very intuitive way to understand why gravity travels at light speed. Gravity is also a massless wave- one of the very fabric of space-time itself, and thus being massless (space itself is just an empty vacuum with matter taking up some space) propagates at “light speed”

[@bystrostrag827]

LIGHT HAS MASS.HOW ABOUT FIBER OPTICS.THE LIGHT CREATES A EFFECT,SO THAT SOMETHING CAN SEE THINGS.ILLUMINOSITY🤨🤨🤨🤨

[@r.1362]

I heard a sonic boom as this video went over my head.

[@wyattbrule12688]

Richard Cassel I’m stealing that line!

[@dlk449]

But he dumbed it down by wearing jeans and a t shirt.

[@ReyCha96]

r/boooom?

[@kiiorigin3544]

Richard Cassel and he stands wired,

[@misanthropickryptonian2626]

That's underrated

[@elbanj]

I'm loving these tutorials. I can almost get my head around some of the key concepts. I feel really smart for about a week and then the details start becoming vague and I'm back to being a bit thick. Great stuff mate!

[@bobbob-sv4mk]

stuart woodings Same!

[@mrstealyorefrigerator2588]

Make notes!

[@darthvader4160]

Bullshit

[@Ratciclefan]

Same

[@marcosarauz9738]

@@dianeshears4858 Where did you get this? How can i know i'm not being double bamboozled?

[@GlennWilder]

When explaining heavy physics, one must adopt a wide stance to adequately bear the weighty concepts.

[@cosmicraysshotsintothelight]

Hehehe... You spelled 'bare' wrong. :-) After all, it was as fleety as a streak of light... do not peer between the legs of that wide stance... one may miss his meaning...

[@HAL-nt6vy]

Some of us have more Neanderthal DNA than others--check out those eyebrows.

[@jerryslater3447]

If "Heavy" Physics are Newtonian and then "Light" Physics must be Einstienian.

[@jonnyj.3417]

Right....?

[@painkillerjones6232]

@@sndgrpr6633 That explains everything!!!

[@caseywright619]

I've never understood the speed of light, or causality better. That was an absolutely amazing explanation.

[@ChaineYTXF]

It is! And you can show actually show the neat result he mentions with high school tools (derivatives, affine functions, a bit of physics), so it's not quite as out of reach as some people might think

[@stevehutton6984]

@@ChaineYTXF Agreed. I first learnt Newtonian physics at school, with v=u+at and equations like that and it all made sense step by step. Im always on the lookout for a description just as simple for relativity. And this video is nearly there for me. It seems the best way to approach it is forget about light, forget about weird spooky shrinking spaceships, just go back to how space and time works. Im going to watch this a few more times and try working through the maths. The aim being showing Lorentz transformations with meaningful diagrams. Something my brain can hang on to all the way through.

[@willjaejaeuniverse5150]

speed of light is made up bs , for example lets say thers no living being that have eyes that can look the light , lets say when u turn on a light the light doesnt move , all the area that is being iluminated by the light is the area where the light source has enough power to reach the more powerful the light the larger the area it will iluminate and be seen in case thers eyes to look at that light , this is why u point a laser in one direction lets say u point it forward but someone who is in back direction will still see the light

[@phuturephunk]

"A teensy bit of algebra." Oh you!

[@igd2108]

phuturephunk but seriously though the derivation of lorentz transformation doesn't really require higher order maths once you know how 2 reference frame communicates

[@MostlyPennyCat]

It's a bit depressing when people have to downplay content containing algebra. It's like everybody what taught that everybody hates it, it's like algebra is a punchline

[@angelodomingo2818]

1st super old comment I've found on here...🤔 are you still alive? Just wondering.

[@gaminawulfsdottir3253]

"How shall we explain causality, the speed of light, and space-time in easy-to-understand terms?" "Let's explain it in terms of a rollerskating pony with a skateboarding monkey on its back... and the monkey is ELECTRIC...!"

[@AnupBhatt]

I understood every word of what he said. And TRUST ME, THIS IS, AS EASY AS IT GETS !! I mean you're trying to understand how the blood and bones of the UNIVERSE works !! Trying to tear it's flesh and skin apart !! (Even though just conceptually not really, I know) Frankly, it'd be tough to do a better job than this in simplifying/trivializing this concept for the masses !!

[@hivatu]

yeah the guy used the worst possible example to explain this, plus a thousand moving objects in the video distracts from whatever he is talking about

[@abaeee]

Good 🐒

[@frankdimeglio8216]

Society of Physics Students -- UCLA has now given the following writing the thumbs up on their page: THE TRUE AND THE ULTIMATE UNIFICATION OF PHYSICS/PHYSICAL EXPERIENCE IS NOW MATHEMATICALLY PROVEN: Gravity/acceleration involves BALANCED inertia/INERTIAL resistance, AS E=mc2 IS F=ma. ACCORDINGLY, the rotation of WHAT IS THE MOON matches it's revolution. This explains why objects fall at the SAME RATE (neglecting air resistance, of course), AS ELECTROMAGNETISM/ENERGY IS GRAVITY. Gravity IS ELECTROMAGNETISM/ENERGY. "Mass"/ENERGY IS GRAVITY. E=mc2 IS F=ma. ELECTROMAGNETISM/ENERGY IS GRAVITY. Gravity AND ELECTROMAGNETISM/ENERGY are linked AND BALANCED opposites, AS ELECTROMAGNETISM/ENERGY IS GRAVITY. This NECESSARILY represents, INVOLVES, AND DESCRIBES what is possible/potential AND actual IN BALANCE. INDEED, time DILATION proves that electromagnetism/ENERGY IS GRAVITY; AS E=mc2 is DIRECTLY and fundamentally derived from F=ma. "Mass"/ENERGY IS GRAVITY. Ultimately and truly, time is NECESSARILY possible/potential AND actual IN BALANCE; AS ELECTROMAGNETISM/ENERGY IS GRAVITY. E=mc2 IS F=ma. This CLEARLY and truly explains c4 from Einstein's equations. THE FOURTH DIMENSION IS THUS CLEAR, AS ELECTROMAGNETISM/ENERGY IS GRAVITY. BALANCE and completeness go hand in hand. I have mathematically unified physics/physical experience. The stars AND PLANETS are POINTS in the night sky. A PHOTON may be placed at the center of what is THE SUN (as A POINT, of course), AS the reduction of SPACE is offset by (or BALANCED with) the speed of light; AS ELECTROMAGNETISM/ENERGY IS GRAVITY. It all CLEARLY makes perfect sense. E=mc2 IS F=ma. Time DILATION proves that electromagnetism/ENERGY IS GRAVITY, AS E=mc2 IS F=ma. GREAT !!! IT IS CLEARLY PROVEN. INSTANTANEITY is thus CLEARLY FUNDAMENTAL to what is the FULL and proper understanding of physics/physical experience. (Very importantly, outer "space" involves full inertia; AND it is fully invisible AND black.) By Frank DiMeglio

[@johnpapish9409]

@@frankdimeglio8216 not sure i understood all that, from what i understand, 'gravity' is not a force but the curvature of spacetime warped by mass, not necessarily caused by electromagentism, but either you are a misunderstood genius, or offbase, thanks

[@jochen4207]

Welcome to another episode of "you won't understand shit but you'll watch the video anyways"

[@kristofkovacsRisy]

I fastforwarded...

[@sputumtube]

@Brian Landers Same here but I stuck it out just in case I absorbed some of it accidentally..!!!

[@wakeuptruth8736]

What is he saying🤔

[@valentinjay2737]

Wär halt praktisch, wenns das in mehreren Sprachen geben würde :D

[@celtjim994]

If you'd paid attention in your secondary school science classes you would be able to understand the concepts, maybe not the math. Lose the video games, close your social media apps and start reading.

[@davidpretorius2984]

It's weird, but learning that there was a speed of causality is very comforting to me... The concept of things being limited to the speed of light was like an itch in the back of my mind

[@joostdriesens3984]

Yes, but empty space is not limited by the speed of light and can expand faster, that is why far away cosmic objects are moving away from us faster than the speed of light (because the expanding space in between). The light coming from those objects will never reach us..

[@willjaejaeuniverse5150]

how about u stop being dumb believe man made bs , thankfull thers still ppl like me who have common sense that know that light is not actually moving its made up idea , for example a candle 🕯has light in it and its not traveling to ur eyes when u see it , if u see a light it means u are inside of the area that the light is being emitted , why do yall think that the light is traveling to our eyes 🤣

[@willjaejaeuniverse5150]

@@joostdriesens3984 the only way "speed of light " could make sense is if u holding a light a something like a flashlight and u move it while the light is on , in that situation then u could say the light is moving but even in that situation the light is not actually moving

[@dtsai]

I came to this realization from thinking about how a video game is made. The programmer is God and maybe aka the Universe. The light you see is the End Result of the Video game. But the hardware and code behind the scenes must make that light must move faster than light or before the light moves. In fact, they have measured some sort of weird delay between what actually happens and what you see. Almost like when your screen refresh on your monitor to catch up with the computer calculations... maybe that is like quantum information signals can finalize where the waves intersect to create atoms.

[@Chickston]

@@joostdriesens3984 Something that really blows me away is the concept of overlapping light cones. Like you can see 1 light year further to your "right" than someone 1 light year to your "left". That means that things in that light year of space exist casually to you, but not to that person 1 light year outside of that light cone. Screw uncertainty, it is certain that points in space can exist and not exist at the same time depending on your point of reference.

[@michaelfox9852]

Theoretical Physics - Exam Question 1: --Imagine Curious George is riding upside down on a skateboard hovering inches above My Little Pony. Also, Curious George is electromagnetic. Calculate the speed of light.

[@n0rie9a]

its a constant guy

[@santhammaamma6024]

Is the pony a virtual photon?

[@santhammaamma6024]

Then it could produce four dimensional divergence in an anti semetron that produces zero which ,in quantum mechanics, is called light

[@santhammaamma6024]

Otherwise the stuff it produces cannot be identified.

[@khalnetherfields7263]

hahahaaaaha!! trick question though, right?? man im getting good at this

[@ItsTheCookingBooth]

This man stands like he’s about to block a defensive end.

[@romancotton8536]

lmao

[@trumanhw]

This episode was as accurate PBS news or documentaries have become since 2016. making their name stands for pure something or other ... WHY should everyone's CLOCKS reconcile off the speed of light ..? whether they're travelling 99.99% the speed of light -- and shoot a laser in front of them (or turn on their headlights) ... only for their clocks to slow concomitant to their relativistic speed, such that they perceive the speed of that light to simply be "C" despite their speed also being indistinguishable from C ..? WHAT OTHER than light is demanding this reconciliation. This claim is PURE POOP. (Much like the 10 hit pieces they did on orange man. Pure dookey of a MALE-COW ... which are words this channel is just TOO insecure to endure ... as if they knew they were true!? lol. Talk about reconciliation!

[@knapret]

@@trumanhw Time dilation is not something PBS made up. Ever heard of Einstein and his theory of relativity? That theory has been proven accurate again and again through experiments. If you want a real life everyday example, read about satellites in orbit around Earth where time dilation occurs exactly as predicted by that theory and therefore we can compensate for it.

[@brainkill7034]

@@knapret maybe he hasn’t ever heard of GPS before 😂

[@colinmccauley3301]

there's a janitor at MIT who knows exactly what this guy is talking about

[@prathamsharma3101]

His name might be will hunting

[@dvipadapogunuru2309]

haha😂😂

[@thegreathadoken6808]

Much more than that, after spending half an hour writing some math on a napkin while drinking coffee, he'll unlock the secrets of FTL propulsion.

[@yourname6054]

But he is not stupid and keeps his mouth shut.

[@colinmccauley3301]

@@yourname6054 a characteristic many of us should adopt

[@seankrake4776]

I really enjoyed this. I think the thing that applies to my job the most is understanding that while the speed of an electron or other charged particle is fixed and slow, the speed of the magnetic waves propagation is also fixed, but at the maximum speed possible.

[@user_2793]

Wow, you captured the reasoning behind the Lorentz Transformation so beautifully without doing any math! For anyone who has a good understanding of classical Mechanics, I'd also recommend Leonard Susskind's lectures on this.

[@jamesaritchie1]

If you want to keep your sanity, I suggest forgetting Leonard Susskind and going with Lynyrd Skynyrd. Quantum is getting stranger and stranger, and the math is starting to reflect this. It's almost as if quantum theory, or even the universe itself, perhaps, is reacting to the math, which is reacting to quantum theory. The universe is behaving like it isn't real, like it's an illusion, that changes according to what we say it should be.

[@thewindgamer2607]

Thank youuu I’ll watch them when i get a good understanding of classical mechanics😂🙏

[@bigbeeoei2278]

Susskind? Idk sounds kinda suss

[@JamminClemmons]

@@jamesaritchie1 Dis Earth be FLAT you American dum-dum! Americans always so drama full and not thinking, at all times yah!

[@ronjon7942]

Thanks for recommending Susskind! I hope to get lost in some of his playlists, he seems to be an excellent lecturer.

[@Beccinams]

Worst drinking game ever: Every time I truly get one of these videos I take a drink. I’m still sober in 2020. One day though. One day.

[@stefgori306]

Do elementary algebra for 2 weeks and you will be ready.

[@bronthkestramenk5858]

@@stefgori306 ml m0okn. K.

[@alwaysdisputin9930]

lol Rebecca

[@georgeb.wolffsohn30]

Drink when you DON'T understand one of his explanations.

[@brainkill7034]

@Rebecca Whip Ovin the thing that matters most is that you haven’t given up yet. We commend you!

[@jackwright3996]

It's such a trip listening to your native language and having not even the slightest idea of what is being conveyed.

[@freddieh5539]

Haha...try watching the video about the Turbo Encabulator.

[@dinhnguyen2110]

@@freddieh5539 No, I understood that one. It is literally made to convey nonsense in a sophisticated manner.

[@ВагизХанбеков-л4в]

Imagine, how insane is an idea to use this video to improve my English))

[@jodiaxenva5643]

Much this video is going much faster then the Speed Of Light But is an Okay Sets of Rules by Great Mathmaticans and Great Videos

[@EspenFrafalne]

I thought it was just me having been on a 3 day alcohol binge, and not being able to pay attention, LOL :P

[@supremevegetable9452]

"Imagine a pony on rollerblades, with a monkey skateboarding along its back. And make it an electric monkey." I don't think any of us saw that coming.

[@tarmaque]

Peter Gabriel did. (He sang _Shock the Monkey_ ) kzbin.info/www/bejne/Y6KTdWCXaL5-h7M

[@ChaineYTXF]

The electric monkey certainly didn't

[@DrCorndog1]

@@tarmaque No surprise there.

[@Drunk3nMonk3y72]

Four years too late. But this comment section is hella funny

[@earthygreen]

I just got here, and I agree. lol

[@ballelort87]

No worries, we're keeping it alive breh

[@SkiingxMoose.]

The youtube algorithm is keeping this series timeless

[@fox_the_apprentice]

It feels fantastic and we're, still alive!

[@whatshouldinamemyself481]

the way he stands makes me think he's gonna run away

[@peurmartis641]

lmao dude this keeps cracking me up for some reason

[@Ginni14328]

That literally make me laugh too hard for a min 😂😂😂😂

[@HAL-nt6vy]

He gonna need hip replacement afore he's fifty.

Well he can't be going too fast.

[@whatshouldinamemyself481]

@ at the speed of light

[@TheMarcMan]

Not going to lie, I wasn't prepared for this

[@geekjokes8458]

me neither, his lack of beard is scary

[@doncourtreporter]

Keep it up. I'm 65. Still LEARNING. These lectures are worth 100 thousand a year.

[@KCstrick]

GeekJokes

[@HughMcGuire]

Nicolas Fredette I'd reccomend reading the book before watching the series, although the series is great too and I agree with your views on Sagan vs Tyson.

[@doncourtreporter]

I saw Cosmos when it first was presented by Sagan, and later saw the series hosted by Tyson. Thanks.

[@HarryHaller1963]

Even though I have a bachelor's degree in mathematics, and a much better understanding of physics than the average college graduate, I'm going to have to watch this a dozen more times to understand it fully. But by the same token (my education and what I've learned from extracurricular study), I can confidently say that this video really does explain everything promised, and more--in an incredibly concise way. Fantastic job!

[@schmetterling4477]

Mathematics is not physics. It's not even close. Not that a bachelor in mathematics is worth anything. Even my high school math teachers all had a masters degree. ;-)

[@kbanghart]

​@@schmetterling4477 so a degree in math is worthless? Lol

[@schmetterling4477]

@@kbanghart A bachelor's degree is worthless, whether it's in math or hair styling. What employers are looking for in the job market is people with experience. That requires four to ten years of study and active work in the field, at the very least.

[@kbanghart]

@@schmetterling4477 thank goodness that was not the case for me and many others.

[@schmetterling4477]

@@kbanghart They hired you freshly washed out from high school as a hairdresser? Good for you! :-)

[@antoniolewis1016]

I'm a physicist and I love you for explaining this so well. Can't wait till virtual hugs are a thing.

[@HAL-nt6vy]

@Antonio Lewis Whoa there fella. Didn't you see that wide stance? A virtual "hug" is not on the program.

[@aethervortex]

You're no "physicist" Antonio if you took any of that BULLSHIT seriously!

[@ihsahnakerfeldt2765]

@@aethervortex Can you elaborate?

[@Pados_music]

@@ihsahnakerfeldt2765 Are you kidding? Tesla's face shows he's just anonter fanatic who thinks that everything is a huge conspiracy. They cannot support their idea but they are always willing to slander a scientific theory.

[@ariellopez8736]

yeah you lost me from 0:00 to 12:46

[@thedelacruz]

Ariel Lopez I've heard this explained much simpler. He speaks too fast and convoluted.

[@romanopaso]

its like he is rushing to take a shit.

[@PRdeSO]

I used to be smart, and then I watched Space Time.

[@corriethomson2916]

Sewer Man beats being a fucking douche bag P.S it's You're, fucking dumbass

[@titobruckner5628]

Ariel Lopez and elnubnub=nice people (and funny). Jacob Turnbaugh and Sewer Man=mean people (and a bummer).

[@evilcam]

Another spectacular episode. This is quickly becoming my favorite channel on youtube. I was (and of course still am) sad to see Gabe leave, but it is beyond obvious we're in good hands with Matt. MY love for this show has not waned one bit, Matt is knocking it out of the park each time, which honestly I did not think anyone who is not Gabe could do this well with this format. I was wrong, and I am very happy for it. The community is also still pretty much the best damn community on youtube. Especially with boss people like Gareth and mage davee, and a ton of other crazy smart and helpful people answering all the questions that are given to to them. Add to that the continued and frequent contributions from people working on the show itself, and this is quickly becoming a community you can't help but be proud of, and make you want to participate in.

[@mattdangerg]

They've gotten a lot better at explaining this stuff in laymen's terms in the newer videos

[@DrCorndog1]

I'm not sure how they could have improved the clarity, if that's what you mean. But they did get a bit hand-wavey at a couple points, so maybe you mean they've gotten better about going into relevant details while still keeping the videos digestible.

[@mattdangerg]

@@DrCorndog1 I meant what I said

[@cosmicHalArizona]

Yeah OK

[@irokosalei5133]

Perspective, I liked the more straight forward explainations, surely less funny, of the previous host. (he's called Dave and the current one is Matt)

[@Jkirk3279]

“Assume the Universe makes sense”. Oh, and he was doing so well !

[@tomgreen1779]

The universe makes sense. He just can't make sense of it.

[@No-oneInParticular]

@@tomgreen1779 so profound.

[@achyuththouta6957]

@Geo Thomas The universe doesn't make sense because every observer measures the universe differently. Somebody in motion will have a velocity and his time would be slower than your time if you are at rest. So technically your past is that person's present. Hence there's no reference frame to describe reality. We perceive reality through reference frames. The only thing that you and that guy in motion can agree upon is space time interval or space time. That's the only thing which every single observer can agree upon and that is the only reality. The universe the way you perceive it is only real to you and you only. But only space time is real for everyone

[@achyuththouta6957]

@@tomgreen1779 I don't think you understood what he said.

[@phenex551]

He did say “Assume”.

[@stephtube4785]

You lost me after you made the monkey magnetic

[@prakjain]

It was made electric though.

[@eirikhgmoekjelsnes9752]

@@prakjain well he is lost, so...

[@adityasonawane686]

@@eirikhgmoekjelsnes9752 😂😂

[@TheLe016]

That part was covered in Physics I

[@D00MSDAYMACHINE]

Since when did incompetency become a thing to be bragged about?

[@zebedie2]

The speed of light is related to the simulation draw distance, it can be altered via a slider in the game settings.

[@pavelborisov515]

Thanks, it helped

[@fungushoney9958]

Now I’m wondering what effect cranking the speed of causality up would have on gravity and the passage of time

[@drbonesshow1]

We found the speed of light - how incredibly fast it was - but then we found out how incredibly slow it was - considering the size of the Universe,

[@intractablemaskvpmGy]

Best comment so far!

[@irokosalei5133]

Which adds to the idea that the universe is a very messy place and the existence of a potential "designer" very unlikely.

[@drbonesshow1]

@@irokosalei5133 What you perceive as messy is simply unknown to you. A built-in uncertainty always keeps the creator hidden from inspection.

[@Senriam]

@@drbonesshow1 that’s a very clever way to make your beliefs unfalsifiable. Choosing to believe in some thing that is unfalsifiable is intellectually and epistemically vacuous.

[@drbonesshow1]

@@Senriam You should consult Karl Popper.

[@redblade8160]

The speed of light is not about light, it's about paying the electric bill.

[@Sohlstyce]

LOL

[@jamesferrell336]

and if you don't pay it they will cut you off at the speed of light

[@enricoquintavalla1278]

you are a genius

[@helicopter2293]

🤣

[@jamesroyle6888]

I might as well have just watched a knitting tutorial in mandarin.

[@petetong9725]

Knitwit...lol

[@SpaceGirlLovesTacos]

Lol for real. I was lost immediately.

[@TheSmileyTaste]

😄😂

[@zlac]

A knitting tutorial in mandarin? You would probably learn something about knitting even from THAT!:D

[@paulschuurmanspetrovic7770]

I dont LOL very often, but you did the trick (o:

[@mr702s]

I love seeing these older videos after seeing new videos challenging the previous thoughts and theories. So happy they are continuing to dig deeper into the fundamentals of what makes our reality. Continuing to ask how and why and finding better answers.

[@ufotv-viral]

👏🏻👽

[@ForumArcade]

We need a finite speed limit for our *experience* of reality, which is also what space-time is fundamentally defined according to. There are unanswered questions about the nature of that experience though, and it's worth considering that on some deeper level, everything does exist as a hole, cohesive, "here and now". Both could simultaneously be true.

[@fahds2583]

my brain bends space time in a way that this topic went right over my head

[@HarshRajAlwaysfree]

My brain is more focused on his lack of beard

[@matthewweflen]

I'm 12 seconds into the video and I wholeheartedly agree.

[@elinicoritale6384]

Right? So weird 😂

[@melonshop8888]

HE NEED THE HAIRCUT NOT BEARD 😄🤣😋

[@andrewlankford9634]

Yeah, he can't be a real physicist. With that lack of a paunch, the reason he's wearing that t shirt can only be to show off his physique. I know of no real physicists who are into that sort of thing.

[@pruje]

He was way hotter with the beard.

[@jpman9]

A dude this smart saying the name “Epsilon Lazerface” without skipping a beat. Subscribed.

[@MrJmwilmott]

Bro looks like he just found this info out and ran up to tell you

[@kedi2109]

lmaooo .

[@jamestnov41945]

Thank you Matt. I absolutely love your channel. You are of course brilliant but you are not condescending to your audience. Well done.

[@orenmashko1177]

'You can't move faster than the speed of light in the same way you can't move slower than standing'

[@Filosofuerza]

Great commentary!

[@vume7722]

The big bang tells us that you can not standstill completely in the universe , the expansion triggered by that moment of the big bang in getting faster and faster.

[@randomguy263]

@@vume7722 | Well, spacetime is increasing, that doesn't mean that you move. You do move because of gravity, though. And the heat in your body.

[@daxhunterjordan]

LOL im crying

[@kingwillie206]

Random Guy - No, Vu is correct in a literal sense. We are always in motion because the Earth is in motion and we are on it, the Earth is spinning at around 1000mph in addition to that movement, the galaxy is moving, and everything else in space is moving along with expanding empty space. The consequence is the inability to truly be still and a Universe without a center point.

[@rabin_7]

Don't get confused guys That heavy stance is for directing his mystic energy to make letters, pictures and himself to float around in space

[@frepi]

Yeah...I had the impression that he was doing his Dr Strange impression

[@TheCarnage2001]

underrated comment!

[@acrobatmapping]

Question- some galaxies are so far away from us that even at the speed of light we could never get to them. If the speed of light is actually the speed limit of causality in the Universe rather than just a speed limit, then how could galaxies this far away possibly have any gravitational effect on us since we are moving apart faster that the speed of causality could reach us?

[@macdmacd7896]

those responsible to answer are visiting the shrinks.

[@OzoneTheLynx]

While today they are too far away for new information to reach us, the gravitational effect information of today left long ago when we were still reachable, it just took until now to reach us. While there is the gravitational effect of the past versions of those galaxies, there will never be such a gravitational effect from those galaxies as they actuallly are right now. Just like we see them now the way they were long ago, but will never see them the way they actually are right now.

[@joyalsaju8878]

@@OzoneTheLynx well said

[@timothyfountain3399]

@@OzoneTheLynx yes indeed, well said.

[@popscola2574]

How could the universe be bigger in size than it is in age? Dosent that prove expansion is faster than the speed of light?

[@davidgrout1056]

I'd like see to see a formula explaining Matt's posture, eyebrows, biceps, haircut and wardrobe.

[@nickames3808]

Like it! LOL!! NOW...put some Grout in it!!!

[@humandroid53]

Phew, the really hard questions!

[@jondunmore4268]

2:54 -- What I learned from this video is that a baby unicorn is also called a pony.

[@jamesthomas5993]

barbies pony at that

[@BetterBlue]

I like that. Bless you.

[@jamesthomas5993]

I have one for females too, its why do female put a ring thru there clitoris,? its so they have a hitching post for that string

[@jamesthomas5993]

just wanted to try another on you, you heard about edible pantys I have something for older folkes , cotton candy filled edible depends with chocolate spots its a meal for both. that's all folks im the comedy commentor

[@RobD2000]

They're rhinoceros'!

[@salvadorhpo2030]

I spent all 12 minutes reading the comments section and laughing. Never mind what he said in the video.

[@johnweerasinghe4139]

Me too...hahahahaha

[@CopperheadGarage]

That's what I'm doing right now

[@peterduffield221]

Ha Ha and me to

[@nimaamini8060]

player2030 same😂

[@brianliveshere]

Me too!!!

[@jdrake411]

I enjoy Matt's videos so much! I'm usually just "hanging on" as he bobs and weaves through the math sometimes, but I always learn something fun and important!

[@garrett7958]

A lot of mind-blowing revelations from this video, but one that caught me off guard was when he mentions that mass is an impediment to motion. Well yes, obviously it is. But then you think about it even deeper and realize that that's what mass IS, that's what energy IS, is an impediment or slowing down of transferring of information within the fabric of reality, which is spacetime.

[@kyrlics6515]

Wouldn't energy and matter be the information itself though? It's just slow moving information, not an impediment to information

[@nursesophie5254]

uh

[@100percentSNAFU]

So in other words...humans aren't meant to go anywhere...since we have mass. And as we all know, as speeds approach C, mass approaches infinity. Light can go this fast because it has no mass.

[@msach4277]

@@100percentSNAFU Depends on how you measure and define mass.

[@iandalziel7405]

Less is more.

[@MICRORuchit]

All was going well. I was getting the courage to make a statement in my head that I understand what he is saying... but then... he decided to make the monkey magnetic.

[@johnkelly6809]

me too... except that then he started to speak... I get the feeling that even HE understands F/A of his own drivel.

[@marcustrevor1883]

@@johnkelly6809 It does make sense if you have taken physics classes. The fact that moving charges generate forces is something you learn fairly early on. The monkey pony thing is just demonstrating different reference frames and perspectives.

[@alwaysdisputin9930]

@@marcustrevor1883 No matter how many physics classes we've done, this video doesn't give ANY reasons why causality has a maximum speed nor why the speed of causality = c. I mean you don't have any reasons do you?

[@noah9942.]

@@alwaysdisputin9930 from what I can tell, it doesn't go into why causality has a limit, just that it does and why it's important, and why that means light moves at that speed.

[@idontwantahandlethough]

​@@alwaysdisputin9930 Yeah. I wish they would have gone deeper into actually explaining _why_ that is the case; it's pretty interesting stuff and this would have been a great video to explain it. I bet there's another video on this channel somewhere where he goes into it in more depth, but it would have fit well into this video and it's confusing enough that it wouldn't be the worst thing in the world to repeat it in multiple videos!

[@MrManerd]

You know, I almost closed this video half way through. I'm glad I stayed till the end,,, him reading the comments was awesome.

[@unsubme2157]

MrManerd read this as i was about to click off lol

[@MrManerd]

Yeah, it was kinda like a "Reads Mean Tweets" segment.

[@unsubme2157]

Was worth it lol. I always forget this guy has a good long end segment

[@robertcousins1265]

that's what she said

[@JohnSchroeder777]

Thank you!! I have always wondered about why the speed of light was used!! Seeemed like a random high number but explaining it as the fastest way to propagate causality it makes sense!!

[@davidrees1840]

because it's the only one you can see?

[@themasstermwahahahah]

Could you explain how gravity can effect massless particles

[@themasstermwahahahah]

So gravity is effected by gravity, and that would mean light would have to have energy, but if energy can relate to mass(e=mc^2), would that mean that photons would have mass

[@themasstermwahahahah]

+omegadan *gravity is effected by energy

[@merinsan]

+omegadan Gravity is not real - I think there was a video on this channel about that. Gravity is the curvature of spacetime, and light (ie massless particle) simply travels in a straight line, which appears curved when you have a curved spacetime.

[@LectiOpi]

+omegadan As explained in an earlier SpaceTime video, gravity is not a force, but an effect of curved spacetime. Earth doesn't "pull" things toward it, all objects move in such a way as to make it seem like it does. Just like a tennis ball would follow the same curved pathway as a bowling ball would, massless particles follow the same "pathway of gravity" as particles with mass.

[@DFPercush]

+omegadan In a certain sense, you can also think of it as a massive particle moving at the true speed of light. It will experience acceleration toward the gravitating body the same as a massive particle, and its path will be deflected as if it's a space probe whizzing by the planet/star/galaxy. You can do the classic "elevator thought experiment" where you have an elevator that is accelerating upwards, and a beam of light is emitted from one side horizontally to the other side. Because it takes time for the light to travel, the elevator will have accelerated past that point when it gets to the other side, and from the reference frame of someone in the elevator (accelerating frame), the beam will appear to curve down, like water out of a hose.

[@AvB.83]

"Assume that the universe makes sense" Well, that is a pretty bold assumption... :D

[@trollin456]

Were all sub atomic particles, doing our part without knowing to keep a greater "whole" going with a sense of individuality. Time cannot truly play a part in anything considering it is a common denominator created by man. I love how we revert back to old people who are dead and use old shit math to attempt to make sense of anything we experience. There is no universe and this isn't real. You will "die" its a perceivable common denominator and a system created. Solipsism is real. Your are the center of life. Look around and see that you truly can do anything. All you have to do is make a move and break free from the system you've been forced to believe in and stay original.

[@JaxMerrick]

I believe Neil DeGrasse Tyson is fond of the quote: "The universe is under no obligation to make sense."

[@robertconstable920]

@@trollin456 I looked around and saw a wall. I made a move, ouch! that hurt. The system forced me to believe I'm still locked in. I can't get through that damn wall.

[@dinhnguyen2110]

@@JaxMerrick I think the concept that the universe is somehow coherent doesn't mean it has to make sense to each of us personally.

[@johnnyregs2378]

This dude looks like Peter Dinklage ate a power up super Mario mushroom.

[@kakarotlifted7302]

LOL

[@brianliveshere]

HAHAHA!!!

[@Baigle1]

XD

[@vfx_jon]

amazing

[@optimuscprime]

I m stiil laughing at the term of "total monkey speed"

[@lopezb]

I've heard all the words before, and already know most of the math, but this is the first time it starts to make some sense. Very useful explanation- he really does know what he is talking about, and doesn't BS the audience.

[@rahulnamaste]

The only thing i understood was Wingardium Leviosa.

+Rahul pandey :-) I could say that my brain produced as much heat that my left half welded to the right half, so I should be smarter now, but it seems to have zero effect… :-/ :-)

Human beings are maybe wonders of nature - no other intelligent life form in the universe can understand how they did so far with such small brains and almost no intelligence… :-D :-P

[@dangerousdingo8846]

+Rahul pandey Don't worry about that. That was the only thing in all of that which they will admit is ficticious.

[@Luisfernando-du2fj]

+Rahul pandey jajaja no eres el unico, aunque entendi mucho, se me dificulta un poco el hecho de que no sea de habla inglesa.

[@Bobay4224]

+Dennis Magee not Levi-oh-SAH

[@Tchild2]

I was understanding every concept up until right up to :04

[@SashKaLakers]

Kinda difficult to pick it up watching once, but still interesting. Got the main point, I suppose. Will rewatch it.

[@Daniel-dc5mr]

Hows progress

[@teaandcoffeeM]

This video is a huge jump for people not accustomed to the math he is talking about. Mathematics is a series of stepping stones after all, can't jump multiple steps at a time. There's really no way around it other than study up and maybe one day this video will be crystal clear.

[@valeriobertoncello1809]

Simply think that WE are the weirdos, travelling at speed different from the default speed of the universe, only because we are always slowed down by the Higgs field. Pure matter in the form of energy doesn't move at those shameful speeds ! 😂

[@Daniel-dc5mr]

***** Not at all

[@ripsumrall8018]

But I'm left with thinking the pony gets it.

[@alecouto]

Your videos never gets old. Awesome content!

[@thecroft6070]

They poo-pooed me at uni, but I always knew quantum mechanics was about skateboarding monkeys and roller-blading ponies

[@russellthorburn9297]

By necessity he's just skimming the surface of the underlying mathematics and physics but he served up as clear an explanation of why "The speed of light is not about light" as one can do given just under 13 minutes.

[@alwaysdisputin9930]

Clear as mud more like. This video is a waste of time. Nobody learnt anything. Nobody here can say why 'The speed of light is not about light'. It is possible in 13 minutes but the YT videos don't exist yet

[@venus_de_lmao]

@@alwaysdisputin9930 just admit you didn't understand it and move on

[@kingmasterlord]

"existence is resistance" I mean, doesn't that cover it?

[@rusttynail77]

@@alwaysdisputin9930 He literally said it does describe light but its the speed of causality first. did you watch the video?

[@alwaysdisputin9930]

@Music:Zerg Yeah you're right. There is no proof that there is a speed of causality so it's not possible to prove in 13 minutes

[@iamkocka6457]

"There is a link of the derivation via the spacetime interval in the description." Oh, good. I was just worried about that.

[@you-said-yes]

I really love how you specifically chose Princess Luna as the pony for this video

[@michaeltaylor4817]

i love the way space time has gone more serious with its explanations. it breaks my brain every week. but will we see any more "fun" videos that try to explain the physics of fictional worlds like games or movies? though i like the serious ones more to be fair.

[@methuen]

+Michael Taylor I like a mix too.

[@aquapurity]

Can't believe how many mouth breathers in this thread criticizing this video. This is one of the best videos I've seen on the subject. It cleared up a lot of confusion and synthesized a lot of concepts. Thanks very much for the video!

[@soburnedout]

To Which subject are you referring?

[@tylerkhuse8644]

It's 2019, why are we all JUST getting this in our Recommened Videos?

[@nialpollitt3410]

Same, weird.

[@elued5981]

Idk

[@BillPeschel]

Because the speed of light does not apply to the speed of KZbin's recommendation software.

[@digisuboob]

to distract you from news videos.

[@HelloTardis]

Why does it matter WHEN you get a random recommendation? KZbin recommendations have always been random. I just dont get it. Why complain about something that you can freely ignore?

[@ImprovisedExpletiveDevice]

Never thought I'd end up watching so much PBS in my adult life. Loved the programs as a kid and they have just kept up with my (limited) intelligence. Great being at the center of the bell curve....

[@mrv9187]

When you’re watching KZbin til 4am and this guy starts popping up means it’s time to go to sleep 😴

[@Amoll881]

man that's funny, it's exactly 4 am for me right now ... what are the odds !

[@omarlua8831]

Coincidence 😂

[@louisuchihatm2556]

@@omarlua8831 I think not😂

[@mecongberlin]

Mr W that is soooo funny, was thinking exactly that when your comment came up.

[@thothheartmaat2833]

Aaaaaand it's tomorrow...

[@brianpso]

Every century we have new geniuses that change the way we think about the universe as a whole. I'm very anxious to know which one we will live to see, in this century.

[@joventlk7300]

The new genius is 001nietsnyef

[@joventlk7300]

Flip the name

[@joventlk7300]

lel

[@dibbidydoo4318]

+brianpso What if there are no physics-changing geniuses in 21st century based on this century stupidity.

[@MattMajcan]

+Dennis Magee that's very true.

[@paulopolvora]

He’s like my girlfriend telling me how was her day at work

[@Martincohenphoto]

lol

[@splntz]

okay i just laughed really hard at that

[@alexojideagu]

First before I talk to you about Karen in accounts, let me take you back 10 years to when I graduated university. That will relate to her attitude when I ask her to make me coffee. The two timelines converge. Also before I get to my graduation, I have to include my relationship with my mother. And also that I saw a cute cat on the way home.

[@siypic]

@Russ Gallagher did you get the" your'e not listening to me" senario?

[@alexojideagu]

LOL RUSS I feel you

[@ItsNathanJack]

These are great videos. An improvement in three words: Slow it down. It’s like the show is in a race. Inserting “Wait time” is extremely effective.

[@ioenglishworld224]

I’m gonna go with “12 minutes is not enough time to explain this concept” instead of “I’m too dumb to get this”. Either way, nice try but this shit went way over my head.

[@xordus]

dude, I actually understand most of this shit and portions STILL went over my head. The analogy about the monkey and the pony were just bad.. I get what he was trying to do, but it really just made everything WAY more confusing

[@a.randomjack6661]

We are okay, it went over our heads at the speed of light :-)

[@Zei33]

IO English World I think it was pretty nicely laid out. He over complicated it to add reasoning, but essentially it’s the max speed that reality can move at. Things that don’t weigh anything (like light) just move at the max speed allowed by reality.

[@kdmichalek782]

I love watching videos from this channel, the only problem is I don't understand most of them.

[@sbkarajan]

This is for people who understood the stuff already, and providing the alternate explanation, not for someone fresh new who had no idea. So it has nothing to do with IQ.

[@cl4655]

Therapist: Matt without a beard can’t hurt you, he doesn’t exist Matt without a beard:

[@anarchyantz1564]

Matt without a beard + Monkey skate speed + Pony blade speed = more therapy.

[@uRealReels]

so this guy has other videos where he has a beard?

[@tevildo9383]

Yes

[@VicDemise]

Usually I'm good at this stuff, but frankly, I need this dumbed-down a little.

[@mortenjacobsen5673]

in short they where all gettign their numbers wrong due to different hypotheses based on current numbers and assumptions . having observed light at a cetain speed does mean its the only speed, and then they base all their calculation on this constant that might be a fluctuating pulse . Imagine if the speed of light was 10 times faster at the start of the univers , that will make the universe 10 time younger than previous thought.

[@James_Knott]

This reminds me of what one of my cousins is involved with. He's a physicist who was studying neutrino oscillations. The point was to determine whether neutrinos have mass. If they didn't, they couldn't oscillate between three types. However, since they do oscillate, they must have some mass. This also means they don't travel at the speed of light.

[@nmarbletoe8210]

neutrinos rock

[@andrewz2854]

@@nmarbletoe8210fr fr neutrinos are lit af

[@chrish6412]

"some infinities can be bigger than other infinities" That's what I tell my girlfriend when she starts comparing me with her previous boyfriends

[@brianmessemer2973]

Wow there's so much going on there 😂

[@zaaz4046]

You stupid, how come you or ex boyfriend or anybody else could be infinite? Secondly, the infinity can't be replicated, it is just a single entity, just like the eternity. She should have kicked you and broken up for this non sense.

[@baldwinivofjerusalem47]

@@zaaz4046 Found the Next Einstein or Tesla!

[@zaaz4046]

Ms Overlord, Infinity & Eternity are the implicit realities of nature, even from the simple logical perspective of an average human being, where you don't need any deep philosophy or philosophers to understand these entities. I can elaborate, if necessary.

[@DavidGonzales-eq2oi]

@@zaaz4046 Okay, first off, if you're going to roast someone... Roast them correctly. It's "You're stupid." not "You stupid" (You sound like a 2-year-old). Secondly, it's called humor. Humor isn't supposed to make sense 100% of the time.

[@mattmoylan4226]

I love watching videos like this even tho the math is beyond something I can really understand, keep up the great work

[@Muuip]

"Assume that the Universe makes sense" --> Good one!! 😂

[@louisuchihatm2556]

@Dirk Knight Its in the video!

[@louisuchihatm2556]

@Dirk Knight Bruuuh....That statement is in the video & its hilarious, its funny...it wasnt supposed to be interpreted or something.

[@louisuchihatm2556]

@Dirk Knight The video is pretty informative tbh. I dont know why you are making a fuzz about this statement....It was just supposed to make a person laugh. lol

[@alexp5569]

I do not think that was a joke. He meant that we need to assume there is a law for it that we can uncover instead of chaos. And by chaos I mean random results.

[@rocketman2077]

@Dirk Knight Did you know that the sum of individual mass of proton and electron is more than the mass of hydrogen, which is made of proton and electron? It's like saying 1+1 > 2. Does that make sense? Not at first. But, scientists assume that the universe has to make sense, and that motivates them to search for a logical reason. There are more examples, like quantum tunneling. If you knew anything about modern physics, you wouldn't have said all the stuff you said here. You're actually suffering from Dunning-Kruger effect.

[@thequeenofswords7230]

lmao I'm like "...princess luna? oh it's an old episode, I was wondering where Matt's facial hair went"

[@gent8940]

This was the most eloquently spoken gobbledygook ever, and I’m grateful to have therefore understood maybe 30% of it

[@RodMartinJr]

And I suspect you'll gain even more understanding by looking up terms, looking up the referred materials, and watching the video a few times more. Re-learning anything with your new, more knowledgeable viewpoint reveals new learning opportunities. Soon, the gobbledygook fades and you're left with not only knowledge of facts, but a more solid understanding of those facts.

[@Tadesan]

I’m pretty sure ‘gobbledygook’ is a racial slur against Vietnamese people...

[@josephjohnson3738]

Be assured that All of most scientific front lines today are nothing more than gobbledygook.

[@josephjohnson3738]

@@RodMartinJr You suspect wrongly, Rodney. Obviously.

[@josephjohnson3738]

@@Tadesan That would be a more truthful definition. Lol..

[@timmo971]

Matt, this is the best, most explanatory episode you’ve done. Is a must see. Twice.

[@alwaysdisputin9930]

This video didn't state a single reason why the speed of causality = c. Nor did it give a single reason why massless objects have to move at c. It wasn't "explanatory" at all.

[@tomlorenzen4062]

I can't even get the fall back-spring forward correct and I'm watching this?

[@mike74h]

Daylight Savings Time will be known henceforth as the Lorenzen Compensation.

[@brothermine2292]

Special Relativity implies everything travels through 4-dimensional Minkowski spacetime at speed c, the same speed that light travels through 3-dimensional space (in a vacuum). The actual equation is: From the perpective of an inertial observer, the square of something's speed through 3d space plus the square of its rate of aging equals c squared. It implies anything that ages at a nonzero real rate must travel slower than c through 3d space, and it implies anything traveling at speed c through 3d space does not age. It sure looks like a fundamental law, from which Special Relativity and the Lorentz transformation could be derived. An open question is whether it's physically possible for something to age at an imaginary rate (the square root of a negative number) because, if so, the equation would allow faster-than-light travel through 3d space.

[@THEREALKEMMZ]

This guys editing skills is Titan level. Great job.

[@chrisbroadstock6753]

I don't quite know what you're talking about Matt, but it sounds smart! - Rafer, 11 yo, Melbourne

[@pbsspacetime]

+Chris Broadstock Thanks Rafer! You should watch some of the older videos (with the other guy!) This stuff starts to make a lot more sense. I can also explain it better next time I'm in Melbourne, though without the ponies.

[@uniphobia]

it's called causality.. you suck at understanding things, hence you can't understand what he's talking about..

[@uniphobia]

I honestly don't know.. you must be a wizard!

[@Vanyali]

@@pbsspacetime where did the monkey go ? Was it to fast or to slow ...

[@jman2150]

I love Spacetime because I can watch it when it comes out 5 years ago and then watch it again today and it's just as interesting both times!

[@Chewbacca0702]

Now the question becomes, if the Lorentz equation places a limit on the rate of information moving through the universe, but the universe is expanding, then if light travels for a long enough time, has it exceeded the speed limit from the frame of reference of its origin? Or is this somehow the explanation for red shifting... excuse me while I get some Tylenol or paracetamol if you wish

[@highwaystar4518]

no i dont wish you to cure your headache i want you to suffer

[@tommyhill199]

Yesterday, while watching a KZbin video on my cellphone, I thought I would order a pizza. I spent about 60 seconds looking around my apartment for the thing that was in my hand. And i only discovered my idiocy when I used the flashlight feature on my phone to look under the couch. I realized my mistake before going down on one knee.. but still. Now I am watching this... technology has created some surreal occurrences in life.

[@jerrylee5463]

I have a sneaking suspicion of what you were smoking when that pizza craving hit you.

[@tommyhill199]

Jerry Lee - nope. Pot makes me paranoid. Just me being soberly stupid.

[@American-Plague]

@@tommyhill199 I have done this as well and feel like a complete moron when I look at myself from an outside perspective...😂

[@williamevans2621]

Nice job! Your videos are very informative, understandable and entertaining. Keep up the good work!

[@DangerClose13E]

This is about the 5th time I watched it. I'm getting closer to actually being able to explain it to someone else.

[@rhisavbora2975]

My 6th time..still vague..I am a high school student(senior year)I guess it's too much for me😅

[@washcloud]

@@rhisavbora2975 ...you should be thinking more with your "downwards head", being a senior at high school. There will be time for you to be thinking about this video much later in life, all the while it will start getting "vague" when trying to "think with your downwards head" and believe you me, that will be the time you'll remember this post...

[@ismirdochegal4804]

The Pony on blades helped me alot on the way to understanding.

[@prathampaul2953]

Are you trying to be genius or want to show off?

[@rhisavbora2975]

@@washcloud woow thanks anyway for your advise..I will definitely try to follow..

[@robhp1]

Mind blowing 🤯 watching these videos is like going from sofa to Pilates with no yoga intro. Re-wiring..

[@PanchoKnivesForever]

I died laughing!! "Thank you! I knew me Ph.D. would be good for something. :)"

[@nocturno7660]

The pony and the monkey just made everything more complicated

[@harishadithya448]

Nocturno Yeah. Also that historical stuff was unnecessary I think.

[@guapoviejo9135]

Harish adithya: No, the history is important. Those of us who dispute history are doomed to repeat it (perhaps not a direct quote, but it conveys my meaning: in that regard it is statisticly similar to the price of rice AND tea in China.

[@guapoviejo9135]

Nocturno: Sure it did, but rationally. "Everything" covers a lot of ground and the size of the ground it covers is increasing in harmony with The Law of Entropy in which "entropy is disorder". The Law states that the total amount of disorder in the universe is increasing at the expense of order. Substitute "CONfusion" for disorder and "Fusion" for order and what do you have? Well, my interpretation is that the amount of CONfusión is increasing at the expense if fusion (CON meaning against and fusion meaning the coming together of- such as in a thermoFUSION atomic bomb as opposed to the fission bomb). Does that make it less complicated to you? It did and does make it analogously easier/simpler for my little brain. Or, as my grandfather (who had only a high school education) told me, " The nore you know the more you realize how much more there is that you don't know".

[@kobalt63]

The monkey and the pony are the reason why. Its a linear attempt to hint at the fact that 'we' don't know what speed we are traveling at. Nothing in the universe is linear. There are no straight lines in physics. The earth (monkey) is rotating around itself = surface velocity. The earth (monkey) is rotating around the sun (pony) = + oscillating surface velocity 1. The sun (pony) is rotating in the milky way = + oscillating surface velocity 2 The sun (pony) is rotating around the milky way = + oscillating surface velocity 3. The milky way might be rotating around another galaxy ... galaxies = + oscillating surface velocities n. Everything rotates around the centre of the universe. We don't know where the centre of the universe is ... therefore we have no idea at what nonlinear (oscillating) velocity we are traveling. We don't know where the famous location of the neutral 'observer' is ...the centre of the universe. All we can conclude is - if velocity/space/time are related - time itself can't be constant or linear. We basically know nothing. The 'Observer' however at the centre of the universe can call himself God, because by adjusting his position he can travel through time and space ... history and future at will.

[@DavidLee-ot4pz]

Everything is relatively related.

[@MyChillfactor]

This looks a little incomplete..Please explain the causality again using simpler and more practical examples..

[@ameerhamza4816]

Googled it

[@kurtpatterson509]

Imagine a videogame with a refresh rate. Nothing in the videogame can happen at a speed faster than the game can update the position of the pixels.

[@noifurze6397]

need to go through it a third time,this time after smoking a joint

[@arifsaifee4146]

@@kurtpatterson509, dude, you oughta been doing this video :). Very simply put!! Much better than electric monkeys on skateboards and all...But there's still a confusion. If the game could update at infinite speed (or in no time at all), why wouldn't you or I exist? That's what this confusing video claimed. He said mass wouldn't exist because it would require infinite energy to get created - here I believe he jumped the gun by using E=mc2 to make the claim. But why should E be equal to mass times c2? Why can't E be mass times some other constant? Then even if c was infinite I would've existed. All in all, I think what he was trying to tell us (but messed up) is that causality requires a cosmic speed limit. That limit in our universe happens to be 3,00,000 km/s, which we humans on Earth popularly call as "the speed of light". But this speed is NOT about light - its about causality, consistency, life, universe and everything.

[@mrporcupine4140]

@@arifsaifee4146 Yes, he used E=mc2 for saying that without the cosmic speed limit mass would not exist. And it has to be that way because the E=mc2 equation es derived from the relativity of mass, which says mass increases as speed goes up, and said increment is described by the Lorentz transformations. For that reason, the "c" you see in E=mc2 is actually the same parameter that appears in the Lorentz transformations, which happens to be the speed of light. If you know some calculus, look up the deduction of E=mc2 and you'll see everything more clearly

[@gregtaillon4019]

It's pretty enormous that c= the "speed of causality" and not merely the 'speed of light'; this is something so fundamental and intrinsic to even understanding the EXPLANATION of all other concepts, that I am genuinely behooved that it isn't immediately foregrounded and demystified in any of the other basic introductions to astrophysics. (Including this series - but kudos for finally getting there.) Hundreds of hours of videos purporting to "explain" astrophysics, and to date, this is the first one which finally desubstantializes the hypostasis of "light-as-a-thing" against which all is measured, or worse still, the (ab)using of the term "photon" as shorthand for that speed, or its us a metaphor for causality of all other forces. It's amazing, really, the arrogance that physics has in assuming this is either known, assumed, or expected of anyone when it proclaims eg continental philosophy to be opaque.

[@evloh]

Yuk, you are so embarrassing... Get real. This is NEVER how these ideas are taught in hs/ap physics and even into college level physics. To suggest otherwise is totally disingenuous. You aren't brilliant or special; else u wouldn't feel the need to lie on KZbin comments. This is such try hard gibberish... it just hurts me at my core. Also, let's just address that this video has been proven totally wrong, not just mathematically, but experimentally through quantum entanglement experiments just to name one of several other things.... heres a few low hanging otbers: *string theory/ holographic universe/ conservation of information. Yuk sir, yuk.