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How Does Gravity Warp the Flow of Time?
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- เผยแพร่เมื่อ 25 ก.ค. 2024
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There’s a deep connection between gravity and time - gravitational fields seem to slow the pace of time in what we call gravitational time dilation. And today we’ll explore the origin of this effect. And ultimately, we’ll use what we learn to understand how curvature in time - this gradient of time dilation - can be thought of as the true source of the force of gravity.
#space #generalrelativity #einstein
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“Your feet will age 1 second more" bold of you to assume I don't spend most of my time laying around
one second faster you mean!! :)
@@ChairmanMeow1 Handstands?
@@ChairmanMeow1 the closer you are to a massive object the slower the time goes, acording to someone farther away, thats why if someone falls into a black hole you will never see him fall, he will just freeze in time in the event horizon
he says at the beginning "your feet will age one second more (faster)" -- am I missing something?? :(
@@ChairmanMeow1 If you gained one more year of life, you'd be aging slower.
Today is a personal best - I managed to follow along for 90 seconds before my brain threw in the towel.
lol
I usually make it halfway through before realizing I'm an idiot...again.
I'm way smarter than Einstein.
Try science asylum channel.
@@TheKamilkrawczak Einstein never nearly understood TIME, E=MC2, F=ma, gravity, or ELECTROMAGNETISM/energy.
He was, in fact, a total weasel.
c2 represents a dimension ON BALANCE, as E=MC2 IS F=ma in accordance with the following:
UNDERSTANDING THE ULTIMATE, BALANCED, TOP DOWN, AND CLEAR MATHEMATICAL UNIFICATION OF ELECTROMAGNETISM/energy AND gravity, AS E=MC2 IS CLEARLY F=ma:
The stars AND PLANETS are POINTS in the night sky. E=MC2 IS F=ma, AS this proves the term c4 from Einstein's field equations. SO, ON BALANCE, this proves the fourth dimension. ELECTROMAGNETISM/energy is gravity. Gravity IS ELECTROMAGNETISM/energy !!!
TIME is NECESSARILY possible/potential AND actual IN BALANCE, AS E=MC2 IS F=ma; AS ELECTROMAGNETISM/energy is gravity. INDEED, TIME dilation ULTIMATELY proves ON BALANCE that E=MC2 IS F=ma; AS ELECTROMAGNETISM/energy is gravity. Gravity IS ELECTROMAGNETISM/energy.
Gravity AND ELECTROMAGNETISM/energy are linked AND BALANCED opposites, AS E=MC2 IS F=ma; AS ELECTROMAGNETISM/energy is gravity; AS gravity/acceleration involves BALANCED inertia/INERTIAL RESISTANCE; AS GRAVITATIONAL force/ENERGY IS proportional to (or BALANCED with/as) inertia/INERTIAL RESISTANCE. Gravity IS ELECTROMAGNETISM/energy.
E=mC2 IS CLEARLY F=ma. This NECESSARILY represents, INVOLVES, AND DESCRIBES what is possible/potential AND actual IN BALANCE, AS ELECTROMAGNETISM/energy is gravity. Gravity IS ELECTROMAGNETISM/energy !!!
By Frank DiMeglio
I love how the practical effect of this is that GPS satellites have to account for the time dilation effect in order to continue providing accurate coordinates/directions. When people ask what good all this theoretical physics is, that's my favorite example to give.
Anyone wants to check out some yet-unkown-to-him/her science-youtuber?
It's a really great example but I wonder if you took a spaceship and lived as far away from gravity in our own solar system as you could how much extra time would you live? If there are ET's like in an ancient alien type of function it could possible that the same ET's that came to ancient Egypt could still be alive and coming back like it's believed by every single ancient mythology or religion too...
It's kind of weird but at the same time if nothing is nothing than time doesn't apply to it but you have to have matter to matter. Pun not intended but true
@@chuckdeuces911 The ultimate unification and understanding of physics/physical experience combines, BALANCES, AND INCLUDES opposites, AS ELECTROMAGNETISM/energy is gravity.
UNDERSTANDING THE BALANCED AND CLEAR MATHEMATICAL RELATION BETWEEN GRAVITY, “MASS", AND inertia/INERTIAL RESISTANCE, AS ELECTROMAGNETISM/energy is gravity:
Balanced inertia/INERTIAL RESISTANCE is what is fundamental regarding BALANCED electromagnetic/gravitational force/ENERGY, as gravity AND ELECTROMAGNETISM/energy are linked AND BALANCED opposites; as ELECTROMAGNETISM/energy is gravity; as E=MC2 is CLEARLY and necessarily F=ma ON BALANCE; as gravity/acceleration involves BALANCED inertia/INERTIAL RESISTANCE. Accordingly, ON BALANCE, the rotation of WHAT IS THE MOON matches it's revolution. The stars AND PLANETS are POINTS in the night sky. (ENERGY has/involves GRAVITY, AND ENERGY has/involves inertia/INERTIAL RESISTANCE.) E=MC2 is CLEARLY and necessarily proven to be F=ma. Inertia/INERTIAL RESISTANCE is proportional to (or BALANCED with/as) GRAVITATIONAL force/energy, as this balances gravity AND inertia; as ELECTROMAGNETISM/energy is gravity; as E=MC2 is CLEARLY and necessarily F=ma ON BALANCE. I have explained why THE PLANETS move away very, very, very slightly in relation to what is THE SUN on balance. Great. Gravity is ELECTROMAGNETISM/energy. THE PLANETS are not falling in “curved" “space" in relation to what is THE SUN. Carefully consider WHAT IS THE EARTH. E=MC2 is CLEARLY proven to be F=ma ON BALANCE !!! Great.
By Frank DiMeglio
How do they do that?
Paused to watch -Can we break the universe?-, Paused THAT to watch -The Geometry of Causality-, How deep will this rabbit hole go?
[edit: Thanks for the likes]
The rabbit hole goes until it's back on itself 😁
How dare you sir.
It may be weeks til anyone hears from you again
Not sure of the answer, but what I do know is that I haven't been bored in quite a few years thanks to PBS space-time, and other similar TH-cam channels.
PBSception...
"It's 2am, I'll just watch something calm and relaxing to help me fall asleep."
Instead I was foolish enough to watch a physics video that melted my brain.
This video simply explained that we all live in a virtual system. Everything breakdowns in numbers and equations.
@@zhul1988
No, it didn't.
@Cyrus R.
watch?v=87ZIU1SKLRk
thank me later (or tomorrow)
@ReligionlessFAITH
Anyone that capitalizes words the way you do always seem to have some emotional issues. Your words should be able to hold their own weight without exaggerated emphasis.
"According to the rate of expansion of the spacial metric adhered to by academia, the peaches I grew last year should have grown larger than the size of sun"
No, this is not true. You are conflating galactic phenomena with those observable in your backyard. They are not the same. Just as you can't use Newton's equations to predict the motion of electrons; you can't predict the behavior of objects at a galactic proportion.
Einstein's general theory of relativity is one of the most successful theories of physics of all time. Your incoherent rambling and horrible analogies (barrels, really?) do not undo the successful predictions that has been drawn from the theory.
""WHERE IS THE EQUAL AND OPPOSITE COMPACTION which necessarily must accompany the alleged expansion"
Necessarily according to a comparison between the universe and a balloon, or what? This erroneous critique was put to death years ago since observations are isotropic, not anisotropic. Moreover, the model predicts the behavior 1:1 so there's no issue outside of your confused lamentations.
@ReligionlessFAITH
Ouch. You are a bit too out there for me. I hope the physics professors you keep e-mailing answer you eventually.
The animation team should get an Emmy nomination.
CHOOOOOOOCLATEEEE RAAAAAAIAIANNNNNNN
@@jakefromstate5813 A baby boy born without a brain
TayZonday! Its great to see you here! A great man once said “The question is more important than the answer.” I was just reminded how connected we all are. :-D! Seeing your comment and yourself here made my day!
**I move away from the mic to dodge holy water.
During this cosmic fusion we see the release of many... 'Tayzons'
All this science, blows my mind. I find it fascinating. I truly wish I had the brain power to process all this information.
this is why dummies believe the world is flat, gravity doesnt exist, and we live in a firmament.
that's easier to explain than to understand the super detailed intricacies associated with time, gravity, physics, etc.
@@robosing225 This makes me say whaaaat??? That makes me say WTF!? On a flat earth on a clear day in say Kentucky you should be able to see the Rockies and the Appalachians at the same time.
Me to
In what way is it "science"?
@@vhawk1951kl if it is a fact and can be explain, it is science.
Of all physics topics I've been exposed to in my life, time dilation has always been the most fascinating to me.
time doesn't actually exist... it's an emergent not a fundamental... so time doesn't actually slow down.... things just happen slower in faster velocity or more gravity because they have to travel a further distance compared to a stationery target for causality to actually take place.
See “double slid experiment” then
same
@@engineeringartist4801 "Time is constant"
is it though?
@@engineeringartist4801 alright then 👍
This topic warps the flow of my brain.
give it time...give it enough time and you'll rapidly never understand.
brain fluid ...
Given enough time, your brain will begin to understand. Your feet will never have enough time to catch up though. 🙊
That’s just the weed my dude
Nah that not shaved guy is all wrong...
You underestimate how much of my life I spend in a horizontal position.
😂🤣😂🤣😂🤣😂🤣 I love this.
That's what she said
about 1/3 like the rest of the people.
Well i guess the front of your head will still tick a bit faster than the back (assuming your lying face up), even though the distance is less than a foot.
@@neckreth not she, he :-D
Thank you for revisiting this, Matt! What got me hooked on PBS Space Time was that series of videos on E=Mc^2 presented by Gabe, and I watched those many times. Your approach is very helpful and interesting.
Except that he got EVERYTHING wrong in this video. Literally.
Complete nonsense and fantasy but doubtless interesting to credulous sheep, that cannot *help*but believe all that religious bunk.
Love this channel and its host. Filled with brilliant brain busters and really insightful. Thanks spacetime.
Blast! A physics cliffhanger! Now I'll have to sit on the edge of my seat until the next episode!
If you fall off the cliff and somehow survive, then you should be able to watch the next video sooner since gravitational time dilation will make time from your reference frame go slower than time from your reference frame before falling off the cliff
Spoilers: you know how if you drive your car diagonally off a paved road onto a dirt shoulder, the car kind pulls toward the dirt side as you do? That’s because the wheels on the dirt get slowed relative to the wheels on the pavement which turns the whole car like one side was being pulled back relative to the other.
The speed of light in different media like water and air, plus that effect (things turn when one side of them gets slowed), is also why light bends when entering or exiting water.
And the slowing of time near masses, plus that same effect, is why things curve toward them, i.e. gravity.
@@Pfhorrest “The wheels on the dirt go round and round, round and round, round and round. The wheels on the dirt go round and round, all day long.”
He just wants you to "hit the bell, hit the bell. "
you mean you will be gravitionally bound to your chair, expecting their clocks to tick faster than yours so the video is uploaded sooner
I'm not actually late, thats just the curvature of time professor.
🥇
Space... time! :)
Instead of printing, I will use CURVATURE and record your grade with a flowing "F" instead of a block letter.
My girlfriend's curves, not so good timing, now she's late .
I think I've just realized why these videos are especially educationally important- it's BECAUSE they don't dive into inaccessible math, and instead focus on the part that academic courses can't as easily address: conceptual understanding. I was on the most accelerated math track in high school, skipping a total of two years and taking Calc 2 as a junior. Took advanced physics courses too (I was supposed to skip a year of that but had scheduling conflicts). And let me tell you, not to knock the education that I got, but it would have been SO MUCH MORE useful and comprehensive if I would have had the gazillion brilliant analogies and visualizations and everything else that makes this the most conceptually explanatory series I've ever seen. Again, not that teachers don't do a great job, but they just don't typically have the advantage of a highly educated creative team- it's mostly just them. These might have changed my future in ways that I would give anything for now. So yeah, this stuff is absolutely a scholastic treasure trove, and a truly good physics teacher would assign these as homework or watch them in class.
Space is FAKE.
CGI, 3D animations, photoshop.
You can change your future now!
I understand this much: If one part of an object is progressing through time faster than another part, then there’s a net force on that object.
I just wrote up this long comment about how I've never understood how the photon clock generalizes to other orientations and then to prove my point I turned the clock on its side (i.e. parallel to motion) and did the math and found that it still works out. You win this time Einstein...
Isn't the whole deal with Einstein that people have spent ages trying to prove him wrong SOMEHOW and they just can't?
I'll get you, Einstein. And your little clock, too!
As an observer, how do you "see" the photons in either case? are there other separate photons bouncing off the ship's clock photons and then out to you standing on the sideline? Veritasium's speed of light video (oct 2020) addressed this. I like PBS Space Time and have been a subscriber for a long time but Matt's resolution of the twin paradox is total nonsense. I just watched his relativity paradox video. In fairness, it's no different than 95% of what all physicists spew. He says: "You need to follow the logic and the paradoxes will evaporate." Actually - if you follow the logic, you will see that Einstein himself did not use length contraction, simultaneity issues or a spacetime diagram to undo the paradox. And he certainly didn't invoke "changing frames" in the middle of a journey. Einstein used a K frame for the earth twin and a K' frame for the traveler and tracked what they would experience and how it would change during the 5 steps of the twin paradox journey (accel, inertial, decel/accel, inertial and finally decel). Each remained in their designated frame while at times (for traveler) experiencing gravity and other times not. A frame is not a physical "thing" yet physicists try to convince you that a frame change is mandatory so you will digest their nonsense. I have my issues with Einstein's resolution too but at least there is some plausibility there if not for the self-consistency problem (and GPS clocks). Spacetime diagrams on the other hand are so ridiculous they are the opposite of science.
it works only if you take into account the shrinking of distances in the direction of motion, though. otherwise it wouldn't; this is the beauty of the whole thing!
Let’s not forget that Einstein didn’t kill himself.
It was gravity.
I wish I could understand this better. My brain governor hits a wall well before I do.
Well at least there are two of us of the same mind. Mine hit the wall at his reference to the other video....
Same here, I get some of it and then my brain starts wondering off thinking about bills, rent etc.
Stick your arm out at a right angle to your shoulder and close your fist. Then spin around once. In the same period of time your fist and your shoulder will cover two different distances with your fist travelling a far greater distance in a circle than your shoulder. i.e. the speed of your fist (distance divided by time) will be much faster than the speed of your shoulder, even though the two are connected. Your fist will therefore be moving through time, faster than your shoulder is.
Now imagine a little person sat on your fist and a little person sat on your shoulder. When the person on your fist looks at the person on your shoulder, the shoulder person will be moving in slow motion, while the person on your shoulder will see the person on your fist moving in quick time.
Now just replace your fist and shoulder with photons (light particles) which are the fastest known particle in the universe (the speed of light). Now, that means the speed of your fist photon and the speed of your shoulder photon are exactly the same, but fist photon has still travelled further than shoulder photon despite being exactly the same speed. The only way it can do that is if space is curved. And space can only be curved because of gravity and rotation. Thereby inextricably linking light, space, gravity, rotation (everything in the universe rotates to some degree) and 'relative time'. There may be such a thing as absolute time which is separate to relative time, if you can figure out how to travel in a straight line in a rotating universe.
What this also means is that relative time travel should be possible if you can figure out a way to make fist photon and shoulder photon meet in the same place, allowing fast fist photon which has moved though time faster to interact with slow shoulder photon which has moved through time slower.
C (
If you imagine these two curves (curly c and open bracket) are photons beginning and ending at the same point, but the photon on the longer curve travels faster through the curve, even though technically they are travelling the same speed, but the rotation is further out - i.e. the longer your arm, the faster your fist will spin round compared to your shoulder.
keep watching physics videos. You will start to understand
@@ericskutch5053 A bold assertion, that. Been watching this sort of popsci for as long as I can remember (>50 years), and whilst I know ad understand more than most of my friends, when it comes to relativity or quantum stuff I'm pretty much stuck at the point of understanding every word but missing the overall meaning.
Best buy explanation I've seen in a short video. Great imagery and science! Thank you!
You have great analogies. Which akes it a lot easier to understand . Thanks
This, combined with Veritasium's video entitled "Why Gravity is NOT a Force" are two of my most favourite videos of all time!
Edit: But so is the latter’s video on how it is impossible to measure one-way speed of light!
Check science asylum video on gravity, nick covered it earlier
And Vsauce's "What is Down?"
@@tylerboothman4496 yes, that one. YEARS earlier! But quite a different geodesic explanation to science asylums kind of "differential" type explanation.
I still don't understand why. And I don't understand how gravitons work within curved space-time. If gravity isn't a force why does it have a force carrier? And how does that work?
@@cmdr.shepard technically, a graviton is a speculated force carrier if gravity is like a quantum field, "quantized gravity". But since we don't know for sure yet, it's just a placeholder
Gravity is like madness, all it takes is a little push.
I've fallen for that before...
and you go laughing the whole way down
🤨
we live in a society
Thank you PBS. This tutorial actually makes far more sense out of gravity, space, and time than any of my public school teachers ever could.
This video was brilliant! The visualisation was awesome and made it easier to understand the concept of time dilation.
In a video you said that it would never be too late to start with astronomy, so I started studying physics this year. :D
Yeah right!! I'm finishing next year at 32 years old
It is certainly never too late!
What encouraged you to start now if it's never too late?
I heard somewhere that it's never too late to dream 👍
@@ZetaFuzzMachine i am 30 now and would love to start study. How are the work chances aftwrwards?
the rephrase to the question "Why does slowed time cause gravity?" blew my mind. 10/10
Gravity makes the measurements hard. Say distance is measured in some unit. Gravity will change this unit itself, not the distance. It will bend the unit. Think of a 🏹. When gravity kicks in the unit which would be the length of the bow is than shorten to the length of the string. The greater Gravity it will shorten the string.
yeah gravity is the effect, not a source itself
@@paulapple6575 everything is connected in a way. Like pressure, volume and temperature. I think there is a connection between: mass, light speed and gravity. There must be some formula to connect them together. The only way I can think of at this moment is that gravity bends everything. This bending can be in 3 dimensions at once. It makes it hard to understand.
One way of imagination is covering the earth surface with donut shapes, but it could be balls also. Donuts shape give an idea of the force gravity has. The Bernoulli effect is part of it.
It also blew my respect for this guy. There is absolutely NOTHING to suggest that warped time causes gravity. If anything, it is the other way around. But in essence, it is MATTER which warps space. And it is the warped SPACE which causes the effect of gravity. Time bends only to assist in maintaining a CONSTANT SPEED OF LIGHT. On top of that, he got the effect of gravity on time COMPLETELY BACKWARDS. Your feet will age slightly SLOWER than your head, NOT the other way around. Geezus this guy is garbage.
@@paulapple6575 GRAVITY is the effect of WARPED SPACE. And WARPED SPACE is caused by the presence of MATTER. TIME only warps in order to maintain a constant speed of light. This guy Matt is spouting garbage here.
This is easily the best way I've heard this explained over the years
I'm always pleased I'm not giving the talk, so thank you for bearing the cost.
Duality is such a difficult concept to make understandable but if the Equivalence Principle applies to the Rubber Sheet, the Quantum Operator/oscillator shapes of field contours in the Superspin-spiral standing wave-packaging formation, then the Actuality of high frequencies fine tuned Strain Gauge type measurement elasticity can be visualised from water turbulence spirals interactions.
The manner in which boiling water organises in convection colums, and the whole process can be superimposed on a perspective-drawing basis of logarithmic spin-spiral condensation modulation/ interference sync-duration positioning, is a reasonably simple exercise in imagination.
All the components of pure relative motion, axial-tangential instantaneous trancendental dimensionality coordination.., are easy to see "discreetly", and arrange in natural sequences, with practice. 0-1-2-3-4-etc proportioning in Singularity/infinite timing-phase, zero-infinity origin, of spin-spiral wave-particle Quantum-fields of density-intensity condensation contours.
The "photon clock" idea is a functionally disastrous concept, because it's not even a wrongly conceived version of temporal superposition, ie of the kind that Henri Bergson tried to explain by simple observable actions and not the bright and shiny new model of Einsteinian Curvatures of Spacetime. Such is Academic Competition and conventional obsequiousness in heirachical Authority of those far off days...
Holographic projection temporal superposition distance is not the perceived experience, as Relativity reasoning demonstrates. Inertial Frames of reference are snapshot pictures not holographic continuity and relative measurements of scalar density-intensity amplitude and frequency ("ticking") spectrum duality.
"The easiest person to fool is yourself" most comprehensively with Mathematics thought to be Atemporal.
Which is one of those perception paradox, wave-particle duration-duality Measurement Problem, statement of positioning, logarithmic condensation of time-timing mass-energy-momentum continuous creation connection cause-effect principle not object "sentencing" about Mathomagical existence that gives us headaches.
_____
I'm possibly over respectful of the mental exertion required to rise to the PhD Peerage and allow self-destructive pronouncements of unscientific opinions to persist. Case in point being BBT.
Physics, in practice and Intuitive experience is the technique / technology of precision measurement, so the Psychology and accompanying Philosophy of deciding what to measure, how to define measurement and why there's relative significance to the comparative analysis of In-form-ation existing, substantiated by condensed metastable probability proportioning 0-1-2-3-4-etc nodal statements of vibrational logarithmic condensation embedded in Eternity-now Superspin Modulation Interval Conception.
The making of music is the best example of Modulation +/- continuous cause-effect connection in instrumental devices that resonate according to the mental intentions (technique) of coordinated Musicians, by analysis of standing wave-packaging formation in context such as an Auditorium, Projection Theatre. Vocal Cords,Whistles Diaphragms etc are all modular components of "everything is waves".., of time-timing sync-duration here-now-forever Singularity. A general state of relationship to flat-space ground state projection-drawing positioning in perfect-pitch temporal superposition spin-spiral integration.
This is absolute Disproof of BBT.
The Tail does not wag the Dog, the brain is on the other end, and Logarithmic Time cannot be forced to conform to the First Principle Observation of QM-TIME Completeness cause-effect Actuality as if it were not inside-outside AM-FM continuous creation Communication of WYSIWYG.
Adherence to the illusion of separation and discrete events running on personal programs, is a degree of insanity, or on the flipside we all have perceived godlike mind-body attributes because we're embedded in QM-TIMESPACE Actuality. But everyone can address the issues in their own way, with permission from their Conscience/Self.
I love the „Portal“-reference in the Gedankenlab.
@Todd Starbuck Might be because he is german. In german language you write them like „“ , in english like " ". I also get this wrong pretty often.
And the EM drive
“But first I need to give you a refresher on regular time dilation”
Yeah don’t bother I won’t understand that either
@Jamilah Toenailkilla are those testicles?
@@drdrew7475 yes.
@@yoshikagekira6166 Nice
@Joseph K IMO DrPhysicsA's the best but still it's not going to make a lot of difference. This video just doesn't answer the question why time slows around mass. AFAIK nobody does.
It's something to do with mass interacting with the left hand side of Einstein field equation (which is the main equation in general relativity):
Rᵤᵥ - ½gᵤᵥ R + Λ gᵤᵥ = 8πG Tᵤᵥ
̅ ̅c ̅⁴ ̅ ̅
DrPhysicsA says: _"Now, the whole point about this equation is that it balances 2 things: everything on the left hand side refers to curvature of spacetime; everything on the RHS is to do with mass & energy."_
On the left hand side of the equation, there are 4 suspects:
Rᵤᵥ = Ricci curvature tensor
gᵤᵥ = metric tensor
R but with no indices = curvature scalar
Λ = the cosmological constant
1 of these guys did it! It interacts with mass & this is why time slows down.
We can discount Λ "This term is a very, very small term & you will often find it will be left out of the Einstein field equations.
It only becomes relevant when you're talking about major cosmological scales."
@Joseph K khan academy LMAO! My kindergartener has that on her school tablet! 😆
someting like this channel should be an international tv show this would benefit all :) love your channel
I somehow fell on this idea from your last video but it seems so fantastic. And now a cliffhanger! It seems that random Brownian motion in a time gradient might produce a fictitious force, but that would imply that at 0 Kelvin there would be no gravity, which would have been noticed by now. Can't wait till next week.
Another GREAT episode. PBS Space Time is like a really good long term stock. You guys rock! Thanks you!!! Still my favorite YT channel.
Watching part of this episode just reminded me that I was wondering some years ago about the impact of all relevant motion on our experiential perception of gravity (and thereby space-time) within all the relevant gravity fields, but never got around to looking into it and eventually let it fall off my mental list of things to read up on.
The only thing more amazing then this is the fact someone figured it out. It kind of demonstrates that things we think we can never know we might be able to if the right mind can figure it out.
Are you aware that one of the meanings of "amaze" is stupefy?
This gravity series is amazing. I've always been taught mass creates gravitational fields I never knew WHY that was the case or WHAT gravity actually is. I've seen this video (and others) discussed on physics forums. The "experts" there seem write all of this off and say that curved space is what's responsible for gravity, but I feel like that only tells half of the story (it is space-time after all). One question though: does this negate the idea of gravitons in quantum mechanics?
I was always bad in bio/chem and struggled to keep up in high school/college... I found I really understood and loved astronomy after I finished up school and its so unfortunate how "mandatory science classes" completely took away from my time to learn about the subject I truly loved :/ channels like these are absolute godsends such high level lessons I can binge on for free!
you really should check out the MIT free lecture series .. you can basically learn anything given unlimited time this show "I don't have a math brain is not true"
th-cam.com/video/ANCN7vr9FVk/w-d-xo.html
Don't tell me you *believed* all that religious mumbo jumbo about toms etc?
I doubt if you were ever given any choice in the matter, but purely as a matter of anodyne academic interest, *why* do you believe a ll that superstitious bunk about whatever atoms are su[opposed by the religious to be?
Bearing in mind that what you are *told* cannot constitute evince, what -if any real hard evidence was produced to you to prove the existence of whatever atoms are supposed by the religious(*Believers*) to be -for example an atom or eelectron that you could yourself examine, or are you going to tell me that you were provided with no such evidence whatsoever?
You do not by any chance suppose that if other credulous imbecile children or sheep accept without question what they are or have been * told* that that necessarily makes it true, do you?
We grownups call that the fallacious supposition that there is a democracy of truth otherwise known as the fallacy argumentum ad populum, which supposition is quite common amongst the lower classes or credulous imbecile children that simply *cannot*understand why it is fallacious, they seeming to suppose that believing or accepting without question simply *and only* because others believe, to be a rational basis for accepting what they are *told* as true, or that which is and cannot be different, but then that is why they are called the 'lower' classes; their betters know for a certainty that there is no democracy of truth o or that the " oh but most people.... bullshit is bullshit
“I don’t have a math brain is not true” I don’t understand what you are trying to say.
Just when I was asking myself: "Wait, does gravity cause time to slow down, or does slowing down time cause gravity?" we get this cliff hanger with this exact same question!
My brain is mush right now.. :D .. But if time slowing down causes gravity, what causes time to slow down?
I think a better way to say it is the latter, the slowing down of time is what gives us the illusion of a force, or what we call gravity.
That would be mass I believe, if time slowing down is the true cause of gravity
Somehow a heavy mass causes time to slow down, giving the effect of gravity.
We just usually go straight from mass -> gravity, skipping the time slowing down part
It doesn't have to be a heavy mass. Even smaller masses do it, but it's not as noticeable. So the question becomes...
Why and how does mass (aka condensed energy) cause time (and space) to distort?
Once i discussed this with a friend. I told him, that I believe that time is the real source why space isn’t just a point. That time blows up space and let it float like a kite in the wind. And that matter some how stops this and that’s why space trending back to a (x0,y0,z0) volume in presence of matter. That was my explanation for gravity in our discussion.
He laughed. No I’m not a physician, but at least I was not totally wrong.
@@Eronx your thinking is appreciated by me, I don't know why your frd laughed it off, maybe he wasn't able to grasp this beautiful idea. I myself, have a relatively similar thinking about time.
Ive been wondering about this for years... Finally get it!
Shouldn't your feet age 1 sec less (not more) than your head as time is running slower closer to the earth?
Yea , he iverted it
I think the closer to the center of mass, the slower time moves and therefore it would age faster
@@asvpab no, it ages slower. Time moves slower closer to a gravitational mass. Not faster. That's what the Einstein equations suggests.
Thank God I've been waiting for this to be explained on Spacetime for literal years. Thank you!!
EDIT: I have learned nothing. 😭
Maybe this video will help you. It gives a nice visual analogy for why time causes gravitational attraction th-cam.com/video/F5PfjsPdBzg/w-d-xo.html
@@narfwhals7843 This guy is saying that time moves faster at your head than toes. Matt is saying the opposite. One of them is wrong. Matt is right, pretty sure. Still a gradient though.
My thought: if things go faster -> more entropy generation. 2nd law: energy tends to get dispersed if it can do so, and it can do so here. In time dilation. That is pretty cool. Still sounds a bit like a chicken-egg though.
@@vblaas246 Matt is wrong. Time ticks slower near massive objects. He actually says this several times in the video. But he gets it wrong at the beginning and when he says your butt ticks faster to keep you in your chair. It's an error in his script, though. Not his reasoning.
The science asylum talks about why that isn't a chicken and egg problem in the pinned comment to his video. And i assume Matt will talk about it in the next video as well.
anything!
Why the calculation didn't include the sun's gravitational field which obviously we are in also with the earth's own gravity.
"Right now, your butt is ticking faster than your head. Don't give me the motivation to change that." -Some space cowboy that just wants to drink in peace.
Does this mean that in Yogic Flying (aakaasha-gamanam), your head starts ticking faster than your butt?? (see yoga-suutra III 42 : yogasutrastudy.info/yoga-sutra-translations/ysp-sutras3-41-3-55/ )? :D
Isn't your head ticking faster then your bud?
Cue Knights of Cydonia
@@apienootiemiesie9852
You can easily understand it if you think of a string attached to a rotating sphere. The attached end of the string moves first, follow by the end of the string which starts to move in a time gradient, and the stress between the two points is gravity.
I remember a lot of this from that old Oculus Go app you guys made years ago. That was a really fun experience, and I still go back and replay it from time to time just for how engaging it was. Are there any plans to release a sequel or a remaster on newer VR hardware?
What was the name of the application. Longshot considering the comment is a year old but worth a shot.
I didn't understand a lick of that, but I nodded like I did anyway. Thanks Matt!
You mention several times in the video how “clocks tick less in a gravitational field” but then say “your butt ticks faster than your head” considering your head is higher up in the gravitational field shouldn’t it be “your butt ticks slower than your head”?
Same for the “your feet will age one more second than your head” shouldn’t they age one less second?
Your head is moving faster than your feet, it's angular speed is greater. Therefore time passes slower to your head when compared to your feet. That's why satellite clocks need to have their time adjusted or else they become out of sync with the clocks on the surface of the Earth.
@@donotstalkme you are referring to relative motion time dilation. He is not referring to this time dilation because he uses the argument that you are stuck to your chair (you have a gravitational pull) because of gravitational time dilation (head and butt ticking at different rates)
@@donotstalkme Speed causes satellite clocks to slow down, weaker gravity causes them to speed up. In fact even more than the other way around. So the question stands. I also think Matt is confusing/ed here
From my understanding for strictly gravitational time dilation, clocks closer to the centre of gravitational well will tick slower and less time should pass, therefore the feet should age one second less than your head.
@@LA-MJ
He messed up. You can read about it here:
www.google.com/amp/s/amp.theatlantic.com/amp/article/63539/
Sorry, you have it backwards: My butt is ticking slower than my head, unless you are doing a handstand 😀
There’s the same “error” in the beginning that he mentioned the feet age 1 second more than the head. 😅
Yea, I caught that also. Maybe he's testing us...🤔
@@sammorrow8420 easy mistake to make... you're thinking more (in terms of grav) and then instead you say age more... easy done. .
If your butt is ticking, maybe you should see a doctor?
He responses to this at the end of the "Gravitational waves discovered?" video. Thanks audience for pointing out the error.
3:55 YOU DID IT! You finally made me understand!
can u explain to me?
I’m a little confused here, shouldn’t my feet age slower than my head standing in a gravity well?? In the extreme case of standing on the event horizon of a black hole, my feet would be frozen in time while my head still ages.
I agree. Time should tick slower for my feet (and butt) than for my head, not faster as stated in the episode. Unless I'm missing something?
Exactly, that threw me off the chair thinking "Damn, everything I understood up until now is worthless".
The feet experience 1 second less of time so they age more than head per time alive. Maybe that’s how he meant it
I feel like he's throwing me a curve ball,I need more time to understand this!
alright everyone, give him some space.
You're more right than you think!
Gravity is a bending force, it does not pull.
Or throw him in a rocket accelerating for a round trip in the galaxy!
Be careful, he got some of it backwards. Find the mistake.
I wonder who is closer to understanding this concept, myself or my dog.
This was the best video I've ever seen about time dilation
When I saw the title, my first thought was "Wow, that's a really complicated topic for a video."
But then I remembered what I've been watching the last couple of years on this series.
😆
Looking forward to the next episode.
I am curious if it aligns with my intuitive understanding of the emergence of gravity:
All objects are in constant motion though spacetime.
The sum of their velocities through the spacial dimensions and the temporal dimension always adds up to the speed of light.
A photon moves through space at the speed of light, thus it doen't move through the temporal dimension at all, i.e. it doesn't experience time.
An observer "at rest" doesn't move through space at all, thus he/she moves through the temporal dimension at the speed of light, i.e. they age.
The presence of any mass bends the "forward" angles of the temporal dimension *into* the spatial dimension.
Thus forward velocity through time is converted into forward velocity through space towards the center of the mass.
This leads to objects being accelerated towards the gravitational well, and also objects experiencing a slowed passage of time in the gravitational field, as their temporal velocity is converted into spatial velocity.
This doesn't explain alien lizards.
"Why does slowed time cause gravity?" Mind blown.
Mind blown too. But that's such a new idea that I can hardly wait.
Luv your non de plume dude.
Simple light. Light can't ever slow down and anything that bends slows its velocity
Why can't gravity pull a feather down as fast as a 1lb weight ? Knowing that the feather being lighter has less resistance to gravity. Gravity should pull it down just as fast but it dosent .. the ashes off the tip of my cigarette are just as light as a feather but the ash will fall at the speed of the 1lb weight, why is that ? Dose gravity only work on certain things ? Are feather exempt from gravity? Something doesn't make sense here. It has to do with the density or weight of the object. Some how feathers are not recognized by gravity. The spin of the earth 1000 miles per hour. The speed of the earth arround the sun. 67.000 miles an hour. The speed of the sun 828.000 kilometers per hour .. now the earth has to Mach that to keep up with the sun. So you have the earth traveling at 3 different speeds ..
1.000 mph +67.0000 mph +828.000 kph
It dosent make sense we should be feeling some kind of nausea at those speeds but no somehow miraculously we don't feel a thing now those are some mighty mighty speeds there yet we don't feel a thing it doesn't make mathematical sense and it doesn't make physical sense and it doesn't make neurological sense. It does make for a lot of nonsense. People are waking up they're starting to figure out the truth so be careful with these so called experts put in your head. They are experts at what? All I see expertise here is in deception and lies. No matter how fast we're going how many times we're spinning everything else moves except the North Star it's always in place never moving yeah it's traveling at its own speed the other way. Can you see it or can you not see it?
@@cornejoronron Just go learn physics and these questions will become so funny to yourself after.
@@cornejoronron everything about the "speeds" We travel. They are velocities. And that's the whole point of einstein's relativity of velocities. You can test it your self well your driving in your car and you look and see a jet flying way above you and then a boy beside you coasting on a skate board..... same with the sun earth galaxy.
I love that this is the first time I heard admission about the confusing aspect of common visuals of space time curvature using 2d space to demonstrate time. The spheres on fabric analogies to me created more confusion than clarity.
Using this video to teach grade 6 students about the equivalence between acceleration and gravity.
To explain this i needed talk about how acceleration is a change in velocity. And what that really measures in terms of time.
I wish it was called "speed of causality" instead of "speed of light"
Seems more intuitive to me - unless I'm misunderstanding
edit: suggested below - "speed of interaction". I guess I'm not getting the difference
I guess in my head, I have causality and information flow as the same thing
What's more intuitive is up to the individual. Causality is possibly more fundamental, since light moving at that speed appears to be a consequence of the properties of the universe (ie: all massless particles move at the fastest speed possible, and photons just happen to be massless), but we don't actually know if causality itself is fundamental or derived (certainly, the fact that time dilation allows for two observers to see different causal chains calls causality's foundational nature into question); or if the speed of photons is, in fact, derived rather than fundamental, just because it _appears_ that way in our mathematical models. The most fundamental description may be the "speed of interaction," which allows causal chains to be reversed, but still fit into a 4d sphere of space-time where the time dimension scales with the spatial dimensions, because all causal chains involve interactions (including the propagation of waves in quantum fields) propagating through spacetime no faster than C.
The speed of light just also is the speed of causality. So yeah I get your point. What people think is that everything else travels at the speed of light. And you're right, what they don't understand is that light travels at the speed of causality.
Speed of light is the consequence of the electric field causing the magnetic field and visa versa.
@@jaysalbhatt2501 I'm your clothes. But the electric field has to change. It's part of one of Maxwell's equations. A changing magnetic field induces a changing electric field and vice versa. So yes that is true.
@@jaysalbhatt2501 It is actually broader than that. Gravitational waves and massless particles also travel at speed of light in vacuum.
The EmDrive isn't a joke that resonates with me.
yes i was personally offended
Was this supposed to be a joke because if so then it's a good one
I have read dozens of books on GR, watched countless videos, and even picked up a few graphic novels but none of those came close to the explanation and visual representation this video gives you of Time Dilation.
"You are held down because your butt is ticking faster than your head"
#science
If time runs slower in gravitational fields then shouldn’t the butt tick slower than the head? I scratched my head at that one..
@@andrewkemp70 to the head it seems like time for the butt has almost stopped completely while the butts time is flowing into its own hole
@@andrewkemp70 exactly, he keeps switching it around when he uses analogies but then says the opposite when explaining how it works.
@@andrewkemp70 and head should be 1 second older than feet
Shouldn’t time run slower the nearer to earths surface, therefore your head would age more than your feet?
12:00 - "Your butt is ticking faster than your head" - Wait, what? Shouldn't that be the other way round? Unless I'm standing on my head, that is.
And he also said at the start that the feet would be one second older. But I feel like it should be the other way around, shouldn't your feet be one second younger, since time moves slower for them?
Imagine there are two rings on the space station, an inner and outer ring, each with its own photon clock. To the outside observer, the photons in the clock in the outer ring will have the longest distance to travel. This means that people in the outer ring will experience less ticks per full rotation of the space station.
Because the inner ring (read: your feet) experience more ticks, they're older.
That's also why you can only travel into the future using higher relativistic speeds. If you were to take a ship and park your ship close to the sun while matching Earth's orbit, you would come back older than you would've been if you'd stayed on Earth.
The real mindbender lies in the fact that from the perspective of an observer on the spacestation, the outside observer experiences time more slowly... But for the answer to that you really should (re)watch the video on paradoxes.
headass- hovey benjamin
@@dicebar_
No, you got it wrong and are only confusing yourself. You should read this:
www.google.com/amp/s/amp.theatlantic.com/amp/article/63539/
Matt doesn't explain this well and misses some subtlety. When considering the relative age of your head and feet there are two effects occurring. Gravitational time dilation (general relativity) and relativistic time dilation (special relativity).
We need set up two frames of reference; clock 1 is on the surface of the Earth, clock 2 is higher up in orbit and there is one person observing both clocks stood next to clock 1. General relativity predicts that the clock 1 will run slower than clock 2 when observed by our person, this makes your head age faster than your feet, you are correct.
The circumference of clock 2's orbital path is longer than the circumference of the Earth and therefore longer than the orbit of clock 1 and the person, however all complete one orbit in the same time. Therefore clock 2 is travelling faster then clock 1 and the person, special relativity predicts that this will cause clock 2 to run slower when observed by our person.
The two effect counteract each other. In the case of the Earth, general relativistic effects are very weak because the Earth isn't very massive or dense, so the special relativistic effects are dominant. Therefore your head ages slower than your feet.
When I see 300K visualizations in only two days, for hard stuffs like this, I get this feeling of hopefulness for human kind.
I've always enjoyed calling gravity as real of a force as the centrifugal force for these exact reasons.
KINETIC IS GRAVITY
@@gistar22 lol
Scrolling past this video causes a little visual illusion because of the thumbnail. Definitely recommend more of that because it caught my attention real quick
"You're held in your chair because your butt is ticking faster that your head." A classic line if I ever heard one :)
It might make a fine niche T-shirt.
Very interesting and well explained.
I do deeply appreciate that it is several times pointed out that the conclusions are based on axioms: if the axioms are correct or not makes the world of difference.
Do you realize that his main two points in this video are COMPLETELY WRONG? Your feet will age SLOWER than your head, NOT FASTER. And, time dilation is NOT what causes gravity. It is the warping of SPACE (caused by the presence of matter) which explains gravity. The warping of TIME only serves to maintain a constant speed of light.
@@djbenje4019 How come you are the only one mentioning this in the comments (as far as I saw)!? He starts the video by saying that feet would be older, but then explains that in higher gravity time passes slower. Am I missing something everyone else understands?
I like the subtle EM drive floating with the guy. :D
Thanks Matt, Can't wait for the next video on 'Time makes Gravity'. I get frustrated when folk say gravitational time dilation is a small effect on earth - when, as you say, it's enough to make most of our gravity. I think our perception just means we are using the wrong units for time. If we used 'light-metre' as our time measurement - it would be much more obvious!
The warping of time is NOT responsible for 'making gravity'. It is the presence of MATTER which warps space-time. Then, it is the warping of SPACE which causes GRAVITY. The warping of TIME AND SPACE TOGETHER enables the speed of light to remain constant. And Matt made a GLARING MISTAKE when he claimed that your feet will age FASTER than your head. It's the other way around. Unbelievable how flawed and false this entire video is...
@@djbenje4019 wait so he didn't just mix up the head to foot example. This whole video is wrong? What was he wrong about?
Wait, don't clocks tick slower in a G-field? So when your dead, wouldn't your feet have experienced fewer ticks of the clock compared to your head meaning that your head would be 1 second older than your feet instead?
Well in Australia everything is upside down, so Matt must be Australian for his statement to hold true
Your head is moving faster than your feet, it's angular speed is greater. Therefore time passes slower to your head when compared to your feet. That's why satellite clocks need to have their time adjusted or else they become out of sync with the clocks on the surface of the Earth.
@Gregory You are correct. Also it amounts to about half a microsecond, not a full second. I think the 1 second result Matt claimed is instead about right for the time dilation on Earth's surface compared to somewhere far away from Earth, over the course of a lifetime.
@@donotstalkme You are forgetting the general relativistic effect, which in this case is much stronger. Your example with GPS satellites is a good one. We might think their clocks tick slower because of their orbital speed, but a competing effect is that time passes more slowly in a stronger gravitational field. For GPS satellite altitude and speeds, it is that general relativistic effect that dominates, and time for GPS satellites runs faster than time on Earth's surface.
@@donotstalkme The time gradient is because mass slows time. It is not because of angular momentum.
Did anyone else notice the ship compressing and decompressing with its changing speed? Very accurate to relativity.
Anyone wants to check out some yet-unkown-to-him/her science-youtuber?
wow that made my head spin at the end
If I am right, I think Matt said it the wrong way - I’m sure he knows the right way and simple mix up.
I believe your head ages faster than your feet.
The earths gravitational field is stronger on it’s surface than on moving up from it.
The stronger the gravitational field - the more space is stretched and the further things have to travel and thus they take longer i.e. time slows down.
Interesting and good episode!
Your feet will age 1 second less. Your feet are in the slower time field
@ No, then you would be pulled upwards. The earth's rotation is a factor, but it's not significant enough to reverse gravity.
@ true but then every thing is going to depend on latitude. Time to write an equation for time dilation as a function of latitude.
@ but then how would you explain the same phenomenon for a stationary earth?
@ I agree. He makes a similar mistake at 12:02.
@Mark Smileer Do you like repeating yourself.? Doesn't make your point any more important.
Can I use this as an argument to beat speeding tickets. The road has a Crest, its beat up not flat has weird angles so when I drive straight down the fall line it's actually an angle relative to a stationary observer and I only appear to be going faster because I'm traveling a shorter distance
Police officer: No
The speed cameras are calibrated for that.
@Anne O'Nymous it's cheaper to be as smart as a lawyer and do you're own bidding 😆
Utterly mind blowing
"Your butt is ticking faster than your head."
That explains _so_ much!
LMAOOO
Thabks so much Dr. O’Dowd. I hope to meet you one day!
I love it when Matt pronounces German words like Gedankenexperiment.
Ah yes the Getnaked experiment. I did it with my girlfriend once.
What I dislike in these conversations is how the word time is thrown out without a definition. What are you measuring when you say time? In this case it seems to be the distance the light travels in a "clock".
The theme you use is so nostalgic to me for some reason! I can’t place it.
That was a MASSIVE cliffhanger. Now I'm itching for the next episode.
Sorry to break it to you, but this entire 'episode' was flawed garbage.
@@djbenje4019 can you explain? Always looking for an opposing view.
@@tyronfoston7123 For starters, his entire assertion that "your feet will age FASTER than your head" is completely wrong. It's the EXACT OPPOSITE, in fact. The closer you are to the gravity source, the SLOWER time passes. That's BASIC relativity theory 101. I can't tell you how heinous a 'mistake' it is for him to make.
Second, there is NO BASIS WHATSOEVER for him to suggest that it is time dilation (the warping of time) that CAUSES gravity. If anything, it would be the other way around. According to Einstein, the presence of MATTER is what warp's space-time, and it is the warping of SPACE which causes the effect of GRAVITY (which makes perfect sense, right? space curves in such a way that objects fall 'downhill' through space). The warping of TIME occurs in order to ensure that the speed of light remains constant, regardless of how much gravity there is, or how fast the object is travelling. Remember, the formula to calculate speed, SPEED = DISTANCE / TIME. Hope that helps.
The first statement confused me. Wouldn't my feet time go slower in a stronger gravitational field?
I had the same reaction.
Maybe because feet are in motion more than heads?
Matt is Australian. Which means from his perspective, the feet are on top.
I'm not serious, obviously.
@@Vasharan but time dialation due to kinematics is only significant for v -->c. I don't think it would play a significant role. But about the statement, yah I think that was a mistake. Ur feet would age lesser than ur head.
@@Vasharan Because of rotation? But that is not the point haha, it is supposed to be about gravity.
@@Vasharan If you assume that feet are mostly used for walking, i.e. they move at about a 90 degree angle w.r.t. the gravitational pull, then the resulting acceleration is even higher, and the time will go slower for moving feet compared to stationary feet. That's probably true for any movement. So if you tapdance your whole life long your feet may age even slower than your head.
2:55 I didn't know how the pause button worked, so I grabbed my laptop superman jumped at near light speed watched the other video and got back just in time to catch the rest of this vid.. bonus, my dinner is cooked ;)
Zoowee!!! The graphics & animation is super-duper. Superman lives!!!!!
"Kinematic Time Dilation" - took me a moment to realize he didn't say "Cinematic Time Dilation" aka Slo-Mo...
I'm a simple man. I see PBS Space Time, I upvote.
#redditmomento
@@alejandromunozpaz4036 I wanted to right "Like" but it didn't sound as good :/
People who live in deterministic universes all need their little escapes.
Thanks a lot for today's nerdgasm.
I wouldn't have expected for it to be this satisfying, hearing you utter the possibility of temporal velocity to be responsible for gravitational effects. While I usually imagine the spatial differences to be what brings gravity into effect, well, tomaato tomayto when it comes to spacetime.
You have a layman's gratitude.
Really cool way to revisit the relativity brothers!
“The flow of time is always cruel... its speed seems different for each person..."
12:00 wait my butt is closer to earth, thus experiencing time slower than my head. shouldn't it be "your butt is ticking SLOWER than your head"?
why do you have to confuse me like this right at the end after I thought I understood most of it…?
Your head is moving faster than your feet, it's angular speed is greater. Therefore time passes slower to your head when compared to your feet. That's why satellite clocks need to have their time adjusted or else they become out of sync with the clocks on the surface of the Earth.
@@donotstalkme Uh huh you got it wrong here sir. Your head would have to move about 4m/s faster than your feet to compensate gravitational time dilation, but is only 0.00007 m/s faster.
Unless I'm wrong, obviously. But there is no mention of Earth rotation in the Pound-Rebka experiment.
@@Milan_Openfeint I really do not know what is the threshold for speed VS depth delta in this specific case, you may be right.
@@donotstalkme Then don't be so confident in your answers/comments to people. You have just spread misinformation across several threads in this comment section... Matt in the video just slipped up and said the opposite of what he meant (confirmed).
Not really, the time dilation due to the difference in speed is much less that the gravitational time dilation. The proof of this comes from GPS satellites that are in geosynchronous orbits (take 24 hours to complete one orbit so they appear stationary) over the Equator. They orbit at an altitude of 26,199 miles, at a speed of 6,876 MPH. The result is that their clocks run slower by 7 micro-seconds per day (7 millionths) due to their speed, but run 45.9 microseconds faster due to the gravitational time dilation on the surface which slows the clocks. The result is that the clocks run 38.9 micro seconds per day FASTER on the GPS satellites. The same is true, to a much lesser extent, for your head and feet.
I don't understand any of this, but I appreciate the the content and support the channel
That was so stimulating, I understood about 20% of that but boy, that was some 20%!
Glad to hear a diss on the “ rubber sheet” model of gravity. Aggravation every time I see that model used as it is misleading in it’s 2D oversimplification of a reality of much greater complexity and many more dimensions.
like i saw in another video: *you cant explain gravity by using gravity*
Yeah the first problem is that the dip should be occurring from every angle. 2D representations annoy me.
Everything would fall into Antarctica
Scientist A: "Can anybody think of an analogy for gravity as an effect of spacetime curvature that people can relate to?"
Scientist B: "Um.... Oh! How about a ball rolling down a hill!"
Scientist A: "No, that's awful. That's not even an analogy. That's just gravity."
Scientist C: "Oooh, what about a marble rolling down a depression in a rubber sheet?"
Scientist A: "BRILLIANT!"
You people fail to understand that the ball-on-a-sheet analog is a basic gateway for the layman. Like most explanations, it lacks completeness and nuance, because that completeness and nuance would simply confuse those not already familiar with the rather complicated concepts involved.
"Your feet will age one second more than your head"
According to Stargate SG-1 where there is more gravity less time happens.
Doesn't less time = faster time? So your feet age faster?
@@Amy-qc2qq for one region to finish ten minutes in the same time it takes another region to finish nine minutes would mean the region with more time had faster time
Well the heavier the object you're standing on the more it bends Spacetime.,
ex: if I moved to another planet triple the size of Earth or just triple the mass I would age slower in there and I would weight triple my original weight.
Angular motion of the earth caused your head to move faster than your feet hence feet aged more.
@@fugslayernominee1397 Angular velocity is the same for head and feet. Linear velocity causes the head to move faster then the feet. You make a good point. I was thinking that the feet being closer to the center of the earth they would age slower due to gravity. Now I don't know which.
Ok the bit with the photon clock made perfect sense, I am so proud of myself 🚀
So close yet so far away. Lol I'm amazed at the oversight.
Here's a question: Presumably the time dialation for the moving observer happens because of asymmetry, he is in an accelerated, ie non-inertial, frame of reference with respect to the "stationary" observer on earth. But let's say the ship accelerates to 0.8c over 9 months with 1g, the guy on earth is also experiencing the same accelleration due to gravity. Since there's no difference, where is the asymmetry and what causes the time for the moving observer to slow?
I asked that myself too! Looking forward to an explanation by someone.
It's a mistake. The feet will be 1 second YOUNGER than your head, Matt!!!
Your head is moving faster than your feet, it's angular speed is greater. Therefore time passes slower to your head when compared to your feet. That's why satellite clocks need to have their time adjusted or else they become out of sync with the clocks on the surface of the Earth.
@@donotstalkme While the last sentence is true, I disagree with the first two. Everywhere on the internet you can find that the closer to the ground you are, the slower the time will be. Thus, the Earth's core, according to some source, is 2.5 years younger than the Earth's surface.
@@srankbichgomory69 You’ve been misunderstanding certain passages when it comes down to space time and gravity. It’s all about from your perspective. Moving faster equal your frame of time is slowing down compared to everyone else’s. Ergo your head is younger. This experiment was done with twins and synchronised atomic watches, one stationed on earth one orbiting earth. Proving the point, higher speed equals to slower rate of time passage from your reference point.
@@srankbichgomory69 The first part of your sentence is true. The last one is not: the Earth's core experiences less gravity than its crust. In fact, the gravity at the Earth's centre of gravity is zero; it grows linearly towards the surface, and then goes back again (but quadratically, not linearly) as you go to outer space. That's only an aproximation (Newtonian, spherical and non-rotating Earth, no Moon, etc.) but it's good enough.
@@donotstalkme Not really, the time dilation due to the difference in speed is much less that the gravitational time dilation. The proof of this comes from GPS satellites that are in geosynchronous orbits (take 24 hours to complete one orbit so they appear stationary) over the Equator. They orbit at an altitude of 26,199 miles, at a speed of 6,876 MPH. The result is that their clocks run slower by 7 micro-seconds per day (7 millionths) due to their speed, but run 45.9 microseconds faster due to the gravitational time dilation on the surface which slows the clocks. The result is that the clocks run 38.9 micro seconds per day FASTER on the GPS satellites. The same is true, to a much lesser extent, for your head and feet.
I was understanding everything right up to that part where you start talking...
Thank you for the reply.