Do We Expand With The Universe?

[@tylerjaafari]

Man, I just love this stuff. Learning about how the universe works and being reminded of how, eventually, each little stellar neighborhood will be ripped away from its galactic clusters and we will all be suffocated in the cold, unending, and unfathomably solitary darkness of space.

[@PerfectBlade20]

Come back cat :(

[@mickeymoose636]

Arctic 3 years later and this comment still speaks to me

[@kiyoshi2693]

And another 3 years.

[@magshdz]

NOOOOOOOO!!!!!!!! CATTO COME BACK!!!!!!😭

[@justsomerandomguy4127]

Another 3 years

[@fijcat]

Another 3 months

[@dylanmorales2209]

First of all, how do you get a leash on a cat? Second of all, you'd be chocking that cat.

[@jakebewely6519]

who cares it's a cat

[@TieableCookie]

Jake Bewely fuck you.

[@fractal5764]

@@jakebewely6519 has your opinion changed

[@icuXD]

Mum! I'm not fat! I'm just expanding with the universe!

[@yektako]

Underrated comment

[@vxdxnsh]

+Yekta Köktürk rate it then

[@Siberius-]

Hmmm.. 4/7.

[@dandondayrit4471]

yperz q

[@superoxidedismutase5757]

The video specifically stated that we do NOT expand with the universe because our electromagnetic forces keep our atoms together. Thus the comment is incorrect and doesn't deserve its likes.

[@pcyumwa]

I have a masters degree in Physics, and I have to say that was the most eloquent visualisation and explanation of universe expansion I've ever seen! I find myself understanding it in an entirely new way. Genuinely surprised, and pleased I watched this!

[@TonyF1MMA]

I've actually been wondering this for a while now so this vid was really helpful.

[@nomansbrand4417]

Same here. However, does this not introduce additional energy into the gravitational or electrically bound system? After all, in the picture presented here, the interacting particles are moving along a force gradient through space. Anyone?

[@zone07]

This is why I tell my wife that I'm not getting fatter; I'm simply expanding with the universe! Thank you minute physics!

[@drednaught608]

You're not getting fatter; you're getting smaller. (relative to the expansion of empty space)

[@zone07]

drednaught608 For me to say that I'm getting smaller might be a turn off for my wife. She might enjoy the term "thinner" but such term might be construed as incorrect. I just don't want her nagging me when I'm eating a burrito :)

[@amihartz]

But you don't expand with the universe, which is what this video explained...

[@zone07]

Amelia Hartman thanks for ruining the joke :(

[@samreads]

Ignore them, +zone07... their sense of humor is shrinking at a rate faster than the expansion of empty space, so their ability to appreciate jokes is tending towards zero.

[@tomatodamashi]

This video doesn't make any sense. I mean who walks a cat?!

[@natheniel]

i did.

[@VixenAurora]

I do.

[@antonmayorenko6736]

If dogs can be walked on a leash, a cat will do it perfectly fine as well.

[@asheqularif6280]

it doesn't work as well as dogs but it can be done

[@chibiemo100]

I walk a snake fuck me right?

[@EternalSilverDragon]

"The cat is off the leash" made me feel sad. :'-(

[@ruhicenetvideos]

He is keeping them, nad once he said he'll find a good use for them, maybe he'll make them books.

[@DiabloDBS]

I meant photon, not sure where i got that "r" from. And sorry that i didn't answer your question, i somehow got it mixed up with another question. As far as i understood the frequency shifts, they occur because light or better photons travel(s) at a constant speed (through empty space). So if you apply any motional energy to them they cannot accelerate or slow down. But their frequency can change and thus any motional vector will be applied to either increase or lower their frequency.

[@Zazz30]

Even though the window would be floating with nothing holding it in place, the window's mass gives it momentum. Momentum is what makes it difficult to change an object's speed and direction, even if that speed is 0. So when the brick hits the window, the window's momentum helps to keep it in place and the brick can smash through it. A window on Earth it's still floating in space, it's just sharing momentum with the planet it's attached to.

[@jktomas]

Very well explained. But what I still don't understand is why was space expanding in the beginning of the universe when everything was close to eachother? Wasn't gravity supposed to hold everything together?

[@craycraytotesbruh3262]

I'm going to go out on a limb here and say gravity has absolutely nothing to do with the size of spacetime. Just imagine in the future when the expansion of spacetime is so fast that the only thing we can see in space is our own galaxy. A future civilization will, from observation, assume that the milky way galaxy is the whole universe and that gravity makes the whole universe spin around it's center. When really all they are describing is how a galaxy works, not the whole universe. They will also have absolutely no evidence of spacetime's expansion. This might have already happened, the universe may have been a trillion zillion light years across but it's expansion rate has made it look like it's only 13.7 billion years old. Think of an ever decreasing event horizon towards your position. The big bang explosion radiation we see everywhere? Just the light of the rest of the universe getting stuck and stretched at the event horizon. So what drives the expansion of the universe? It could be a 4th dimensional bubble (or blackhole) that is expanding due to 4th dimensional gravity attracting 4th dimensional matter into it. With us existing in the 4th dimensional bubble's 3rd dimensional surface.

[@jktomas]

CrayCrayTotesBruh Thanks. I'm sure you know what you are talking about but I'm not smart enough to understand it yet. :) So my question is still open. But you made me wonder. I never thought of that before, but it's really creepy to think that future civilizations will have no knowledge of other galaxies. I know that humanity might never reach other galaxies anyway, but just knowing that many more galaxies with many more stars and planets are somewhere there is comforting in some way. As big as our galaxy is, it's not big enough when you think that that's all there is in the universe. Thank god we live in this time period and not billions or trillions years in the future. But then again, maybe living billions years earlier was even better.

[@mohammadtausifrafi8277]

jktomas Gravity does not obstruct the expansion of space i.e. it does not work on space itself.

[@Crmson117]

@@craycraytotesbruh3262 Yes, a 4-D hyper cube would have 24 faces, each of its eight surfaces being a 3-D surface like 2-D squares are the sides of a 3-D cube. Perhaps our reality is a surface of a higher one or couple n_n

[@icarus313]

"I do." --Gravity

[@drawingboard82]

Very good explanation, thanks. Also worth noting that whilst EM force holds molecules together (ionic and covelent bonds etc.) it is the "Strong nuclear force" which holds atoms together. This force is orders of magnitude stronger than EM but only works across quantum scale distances. It is the reason why positivly charged protons can be packed into a nucleous without being repelled by each other. It is also why atoms with large numbers of protons are unstable. Even if space expanded fast enough to rip molecules apart it would need to expand much faster to rip atoms apart. :-)

[@Cheesebane]

You can tell from the spectrum (graph of emitted light intensity over the light wavelength) of a distant light source (e.g. a star). Each chemical element or molecule in the star absorbs and emits some very specific wavelengths (absorption/emission lines) when it is sufficiently energized and leaves that pattern of peaks and dips in the spectrum. If you recognize the pattern of some substance you'll get the redshift by measuring by how much the pattern was shifted along the x-axis (wavelength).

[@MahraiZiller]

Surely the video should have said that Gravity and Electromagnetism are too strong for the CURRENT expansion of space to overcome?

[@thegreatninjaman]

what IS space though?

[@thezipcreator]

Kurz Gesagt has a good explanation on his channel

[@Manibe37]

+The Zip Creator KURZ GESAGT IS LOVE KURZ GESAGT IS LIFE

[@sparkyd7824]

Space is created when someone sneezes and farts at exactly the same time.

[@Zazz30]

It depends on the distance. The separation between two objects doubles over a very long time. When short distances double in a given time, that's not much of an increase and can be considered slow. If a very large distance doubles in the same time, that's a massive difference and is much faster. Scale that up and you can gets speeds that are faster than light, but on small scales it's immeasurably slow.

[@ObjectsInMotion]

Base energy (Zero-point energy is the official term) stays at a constant amount per cubic meter of space, and some say it's one of the fundamental constants of our universe. As more space is created, the total amount increases, but the energy in a certain area remains unchanged.

[@ddermont6058]

Good god man. Have you ever tried to Leash a Cat????? LOL

[@ginkner]

TLDW: Don't put your cat on a leash.

[@matyviola]

+Ben Actually its put it on a leash or you will lose it because space expansion

[@janiselmeris5705]

Thank you for clearing this up! This was something I didn't understand before. The last "the cat is off the leash" analogy is bad though, because once the cat is off the leash, there is no more force applied by the leash, but you just said that even if the space expands faster, the gravity force is still in effect.

[@Zazz30]

This isn't a rule that says "all galaxies are moving apart", it's that it's like there's a "force" that tends to push them apart that gets stronger over large distances. Andromeda is close to us, so that force is overcome by gravity which gets stronger the shorter the distance is, and the momentum. Whether galaxies are moving towards or away from each other depends on the circumstance.

[@Mr51seer]

because everyone puts cats on a leash

[@ImpakaWarrior]

who the hell puts cats on leashes

[@mindziasin]

I do..

[@VixenAurora]

I do. Cats running around loose unsupervised have SEVERELY shortened life expectancy. My Jack likes to go for walks on leash and harness. It keeps him safe and lets him enjoy the outdoors.

[@BlahLab]

The little add in that the leash is stronger than the force of friction made me unreasonably happy

[@PhecdaPlato]

During phase-conjugate mirror via stimulated Brillouin scattering, generate the laser beam at 308 nm to pump a Raman cell. In time, an out come is Forced Oxidation.. After magnetosphere is weakened. (Weakening Gravity) Rayleigh scattering is a good approximation of the manner in which light scattering occurs within various media for which scattering particles have a small size parameter.

[@musiccat9513]

I AM THE 1 MILLIONTH VIEW!! OMG!* *No one cares, MusicCat.

[@sen7859]

hey i do care :)

[@jeromealday614]

You clearly messed up in making the text *bold*

[@dangflo]

"And the heaven We constructed with strength, and indeed, We are [its] expander" (Quran 51:47) "Have those who disbelieved not considered that the heavens and the earth were a joined entity, and We separated them and made from water every living thing? Then will they not believe?" (Quran 21:30)

[@felizzhappy5276]

No sorry the quran copied science from the greeks

[@reh3884]

dangflo It also says that fresh and salt water won't mix, and that you should kill people that believe differently than you.

[@3ckitani]

+RE H No, it says that there's a place where two different waters don't mix.

[@3ckitani]

aslam khan no, no... "There shall be no compulsion in religion; the right way has become distinct from the wrong way. Whoever renounces evil and believes in Allah has grasped the most trustworthy handle; which does not break. Allah is Hearing and Knowing." Quraan (2:256)

[@Zazz30]

It's an optical illusion caused by the way light scatters through the atmosphere, so you can't ever reach it. It's also actually a ring, so there is no start or end to it. The ground just gets in the way making it look like an arc.

[@oscargordon]

Watch the video again. Objects don't expand. As I mention in another post the expanding rubber analogy is what is causing your confusion, as something drawn becomes larger as the rubber stretches, but that is not what really happens. Your metal bar will stay the same size, it is just that there will be more "empty" space between it and metal bars in distant galaxies in the future. Nothing is "pushing" the bars apart. Each still sits in its original place.

[@MindStrider34]

"And it is We Who have constructed the heaven with might, and verily, it is We Who are steadily expanding it." (Qur'an, 51:47) Quran written 1400 years ago, in a middle of a desert. No technology. Word of the creator or word of an illiterate man?

[@FortisConscius]

Illiterate man. Next question?

[@MindStrider34]

FortisConscius Ok: "Have those who disbelieved not considered that the heavens and the earth were a joined entity, and We separated them and made from water every living thing? Then will they not believe?",Quran (21:30). BIG BANG! Quran written 1400 years ago, in a middle of a desert. No technology. Word of the creator or word of an illiterate man?

[@FortisConscius]

Illiterate man. Next question?

[@felizzhappy5276]

Yea will alll know that the quran copied from the bible....... Isaiah 40:22 Thus saith God the LORD, he that created the heavens, and stretched them out; he that spread forth the earth, and that which cometh out of it; he that giveth breath unto the people upon it, and spirit to them that walk therein: This was written like 2600 years ago and there are many other verse that speak that the universe its expanding...... Im not trying to debate but i dont belive in religion...i only believe in a personal God

[@felizzhappy5276]

FortisConscius these religuos people treat their wives as slave

[@su1T1]

Many possible answers,but there are two basic ones,for even the weakest mind to understand(I'm not talking about any specific one): 1.The two Galaxies may cancel each other out,not just dissapearing,but as they start to spin in "anger" when collided,they may "spit" out almost everything they consist of(the outer layers of it anyways,the inner ones may get sucked in when the two center black holes colide). 2.They eventually form a bigger black hole centered...bigger Galaxy.

[@Zazz30]

Infinity isn't like a 'last number' than nothing can be bigger than, it's a statement that there is no limit - there is no last number, you can always go higher. There are an infinite number of infinities that are infinitely bigger than each other.

[@ObjectsInMotion]

He said that because we aren't sure whether or not time exists, and because the expansions of the universe is dependent on time, its all a matter of opinion whether or not the universe is expanding, or some crazy shit like that.

[@Zazz30]

The expansion of space isn't a rule saying "ALL Galaxies are moving away from us". It's that there is a tendency for them to move away, but it can be overcome. When you push things they tend to move away from you, but it's not guaranteed. In the case of a car racing towards you, the force you exert is easily overcome.

[@Cheesebane]

In other words: assuming that distant light sources consist of the same types of matter we know on earth, certain prominent patterns in their spectra are most easily explained by interpreting them as somewhat redshifted.

[@Damnage96]

Learned more from this video than 3 years of high school physic classes.

[@ObjectsInMotion]

Well because it's the base energy of the universe. Just like when a book fall of a table, it looses some potential energy which is used up in the form of heat and sound. But when it's on the floor, it still has potential energy, it's just that there's no where else lower to fall to, and so the book will never convert that potential energy to heat and sound. Dark energy exists evenly everywhere, to actually use that energy there has to be a location of even lower energy for it to "fall" to.

[@deewhybydeeex]

where I said 'its frequency and hence energy' I meant to say, 'its frequency and energy have both decreased, where did...'.

[@gregonasher]

Dude I've read so many physics books watch so many videos , read so many articles... finally I understand why galaxies are receding but the space between our Atoms, solar system, and galaxy is not. In your one minute video you've made me understand something that bothered me for most of my life. Thank you so much! It's opened up my mind to understand how we detect gravitational waves, and so many other things it all makes so much more sense now!

[@BoringNugget]

I'd just like to thank you, throughout all of these videos you have been making science fun for everyone- and seeing that your the TOP recommendation when you type mini into the search, it makes me happy to know that you've made science so much more fun for the community, Thank You minutephysics.

[@feinorgh]

The Planck length is a constant, and does not change with time. It's just that there is "more" space between distant objects in the Universe as time goes on, but that closer objects remain in roughly the same vicinity over time. The Planck length is defined from three fundamental constants; the speed of light in a vacuum, the gravitational constant and the Planck constant (which defines other Planck units). These do not change over time.

[@sam617523]

If space and time act together as spacetime, then maybe the reason why time is expanding is because of space expanding, or vice-versa. If that is true, then when space eventually collapses after expansion, will time flow in reverse?

[@darthcervantes]

This explained space expansion way better than the 5 hours of science channel I watched last night. I needed it in simple terms and the drawings on the grid helped it click for me. Thanks

[@Zazz30]

Every time something's proven wrong our understanding is refined. It's not like we start from scratch every time, that's how we've made scientific and technological progress rather than staying the same. In simplest terms it's a process of elimination. Proving a theory wrong is more fruitful than finding evidence that supports a theory. Every time we disprove something, that's one less way we have to be wrong and the closer we are to the truth.

[@PaulJohnsonM]

If you want to say they (the plates) fit together on both sides, fine. It doesn't really matter -- they were separated by a giant ocean, because Earth was the same size as it is now. And I know exactly what I'm talking about. Regarding that video, just because the pacific ocean floor is the same age, doesn't mean that there wasn't an ocean and that the continents were jammed together on both sides. The old floor you're looking for has long since slid under another plate, back to the mantle.

[@tonyspilotro2598]

Each metre of space around us is expanding by about 2x10^-18 metres per second (using Hubble expansion of 70km/Mparsec). That's similar to the distance the weak force acts at.

[@BlueCosmology]

You might want to reread that yourself. There's a massive difference between the ideal case without friction and one with tidal friction as that section makes very clear. "Tidal friction is required to drag and maintain the bulge ahead of the Moon, and it dissipates the excess energy of the exchange of rotational and orbital energy between the Earth and Moon as heat. If the friction and heat dissipation were not present . . . the Moon would no longer recede." the orbital system loses energy.

[@DillMine]

I don't get this entirely, but so if light from another universe travels in our direction without getting bended into another direction whatsoever at all, would it not travel to here because space is expanding so it just basically stays in its universe without us seeing it ever?

[@99thTuesday]

This gave me the last piece in the puzzle I was having on rationalising the number of stars in the sky for myself. Thanks.

[@PhecdaPlato]

Adding to that, That polarization or anisotropy of the emitted light can also affect the measured fluorescence intensities because the efficiency of gratings depends on polarization. So .. The "Cat" is almost like "Schrödinger's" cat..

[@Zazz30]

It's unlikely, there are too many problems with that idea. It would mean that the speed of light would have to slow down so it takes the same amount of time to cover a shorter distance. There's also stuff like the square-cube law that explain why smaller animals are stronger for their size. It would also mean that we'd become more dense and if things get too dense they turn into black holes.

[@Zazz30]

It's a matter of semantics, but I agree that bit is confusing. He was trying to point out that everything in the universe as a whole isn't "scaling up at the same relative size [so] it would seem like nothing has changes". Two of the components that the universe is made out of is space and matter. Basically space is expanding, but matter isn't necessarily.

[@Zazz30]

It's not that a meter will be longer, it's more like space is creating more meters. Where there is now a separation of one meter between two objects, in the future the separation will become two meters.

[@DiabloDBS]

The proton losing potential energy is only one cause for the red shift and as far as i know may occur when a proton gets in contact with matter. Google Raman scattering if you want to know more about it, while it's something you can see with your own eyes everywhere it still might be interesting. But in the case of expanding objects the cause for the shift should be the Doppler-effect which you can also experience when an ambulance passes by, maybe you find an interesting article explaining it.

[@junkmailjoebrown]

Momentum relates to objects moving through space, not spatial expansion. As far as I know, we don't know "why" it is expanding any more than we know "why" gravity pulls. But we do know "how" it expands.

[@protocol6]

If anything, we are shrinking due to time dilation/length contraction caused by gravitational collapse as local mass density in overdense regions increases.

[@P0RK3NST31N]

We would be smaller relative to the size of the universe after test 1 and test 2, however our absolute size would not be any smaller. We would still occupy the same amount of space, there would simply be more space to occupy.

[@arlenokstar]

No, they fit together in the Pacific as well. There are many videos online demonstrating this.

[@arlenokstar]

Well, the "hack" (sic) that came up with the Expanding Earth theory was actually someone that provided us with one of the most groundbreaking theories. His name was Charles Darwin, you might've heard of him. Another guy named Nikola Tesla also had a similar thesis although his was a little bit more extravagant.

[@LikeAMos]

Yes they do, not sure if all of them do, but most galaxy have a super massive black hole in the centre of them. Super massive black holes are said to have an infinite density and thus have an incomprehensible gravitational pull. The shear size of them would probably be thousands or millions of times larger than our own sun. Personally, I don't think black holes are anything like a "gateway" or an actual hole. I just see them as a huge frozen ball of really dense stuff.

[@Zazz30]

It looks like it, yes. What appears to be happening is that distances double over about 10 billion years. So if an object is so far away that it takes light 10 billion years to get there, by the time light would have reached it, it will have moved a further 10 billion light-years. Note that the object hasn't actually 'moved' in the traditional sense, it's just catching a ride on space. You'll never be able to run 30mph, but if you run on a train it might appear that way from some perspectives.

[@not4guy]

Why did you represent gravity as a leash? If all the space between everything is expanding the cat in the human would have been expanding in proportion to the ground and if you had an expanding ruler that distance between the human and the cat would have remained the same as observed by the ruler

[@opinionateddrone]

Can you do a video explaining why and how the atoms in solid objects stay together?

[@oscargordon]

This is where the expanding rubber sheer or ballon analogy totally falls apart. If you draw on the rubber and then stretch the rubber, your drawing would get bigger too, which is incorrect. Think of matter more like little pieces of felt scattered around. The pieces stay the same size and in the same spot on the rubber, it is just that more rubber keeps appearing between the pieces. Only on scales larger than galactic clusters does expansion become noticeable over gravitational effects.

[@Apwolsopcjrhei]

This is what I was thinking about yesterday

[@nikkitytom]

I fretted over this puzzle into the wee hours ... Such a beautiful, concise and comprehensible explanation for people like myself who are burdened with endless curiosity along with big gaps in their scientific education. I also like the cat. Mine walks reluctantly on her leash and messes up gravity and cosmic expansion.

[@jareddavidson3010]

What is there for space to expand into? For example like a flash drive, flash drives have memory and once that memory is used up it can't fit anything else onto it. Either space hasn't used up its memory or something is getting deleted out of space for it to grow more.

[@deewhybydeeex]

If a photon was emitted and traveled through space for a large distance it would be red shifted due to the expansion of space, this would also mean it would have a lower energy as its frequency would have decreased. Where then does that energy go?

[@AmokBR]

Ever thought about how small certain things are as well? Like fundamentak particles. They live in an unimaginably small world. In fact the size of fundamental particles is not even really defined, they are treated as mathematical points in quantum physics. That's just as crazy as thinking about how big the universe is.

[@Rhids22]

An as explained in the video, the force of gravity would keep the celestial bodies in orbit, plus the expanding space would keep them moving apart. The idea came from another of Henry's videos where he talks about "what happens if an unstoppable force hits an immovable object", and explains infinite energy is not physically impossible if a body can move away from another without being stopped by any force. I don't believe it is possible, I am just curious to why not!

[@PanagiotisLampropoulos]

All about forces positives and negatives have the power attract the things at the side which is more effort than its opposite.

[@DudeRealistic]

Burning question here: If expending of the universe accelerates, eventually, we will see it go faster than electromagnetism can pull things together, right?

[@codekillerz5392]

This has been theorized and is called The Big Rip. Google it.

[@karenwang7826]

I have a comment to the last sentence you said: Thats true but the electromagnetic force between the protons and electrons are stronger than the force that is pulling them apart since they are rather close because of the size of the atom

[@Nfinch1992]

This makes so much sense now, I always wondered why universes didn't collide more often with this expansion thing.

[@macronencer]

Yes, that sounds exactly like what I had in mind! Let's hope it becomes more common as a way of doing things...

[@bluberry371]

when i watch 15 minutes of these videos i feel like ive learned as much as i would in 2 hours of school

[@Evipicc]

Unfortunately I am not understanding that as an answer to my question, so light IS effected by the expansion of space but matter is not? The wavelength of the light should be a constant if it stands outside of space's expansion.

[@kevindst]

1:27 You might be misleading here, I thought redshift is caused by velocity, not stretch of spacetime, although the stretch of spacetime is what causes stars leaving us at a high velocity. You make it sound like space is stretching the light

[@alainbouchard5144]

What is the distance at which the two forces are balanced, the attraction between galaxies and the expansion of the universe. Where do they cancel out so that the relative distance is fixed? (proportionally to the size of the galaxies of course). What is the distance at which two milky way size galaxies will collide?

[@Hardcore47Hero]

Does this mean there is some kind of friction applied to all the bodies within a galaxy? Since space is trying to move them apart and has to fight the gravity that is holding them together, is there some form of drag going on?

[@alexanderdrabenstedt6575]

Like it is drawn in the movie, when space "expands" between man and cat, the number of distance units (squares) actually decreases! Shouldn't space (the yardstick) shrink to get more distance between objects?

[@BlueCosmology]

Ah, so you've entirely not read what I said at the start. I said the moon is losing energy from tidal friction, not the moon is losing energy in total from tidal forces, though I notice now that I've made a typo and said forces rather than friction in the reply to you as you've started talking about something completely different to what I said. Also, no there can easily be a net loss and a gain in height.A rocket going straight up but then encountering drag, net loss in energy, still going up.

[@LincolncentralNet]

You've missed the point. We are talking about solid objects that are NOT expanding. The old definition of a metre relied on two mark on a metal rod, placed a metre apart. According to you, this will remain the same. However, a metre related to wavelengths of light will in time get longer. The wavelengths will be stretched apart. The speed of light is the same. the time interval is the same. The metre related to light, in time, will be longer according to you.

[@eldenfindley186]

I think it would be cool to see a video on Chaos. Order and disorder are interesting topics.

[@hazabo1998]

Space expands at such a fast rate that there is no way of catching up to the edge thus making it infinite.

[@Zazz30]

The effect of the expansion is a little like the opposite of gravity - it gets weaker the closer things are. Because Andromeda is close to us the effect of expansion is relatively weak and can be overcome.

[@LaureanoLuna]

So, are the bonding forces of gravity and electromagnetism somewhat weakened in our environment, though not overcome, by the force that's making the universe expand?

[@DiabloDBS]

Well the Mythbusters often lack some scientific approach but for an entertainment show it's often pretty interesting. But as far as i remember they explained it rather well why the plane is not really affected by the conveyor. The plane is not accelerated by the wheels so as long as they can keep up with the speed of the conveyor plus the speed of the starting plane it should start as on a usual runway.

[@ferrer985]

there isn't a fixed distance. the expansion force increases exponentially over time. There might be a certain period for 2 masses to be in balance to eachother, but eventually the expansion force will pull them a part. But that will still be long after several galaxies have collided, like our Milkyway with Adromeda.

[@nanodonna4122]

That's a relief. all time travel movies would be wrong if we expand with the universe. If you travel back in time you might be a giant O__O

[@Skeptic080]

In that example you've given, scale doesn't matter at all. If they're both traveling 100mp/h then they would both travel 100 miles per hour.

[@killop141]

so let be get this right space is increasing in size at a slow rate but what is causing that expansion could it be possible that we are not expanding but instead be are being pulled by something and the reason that space is increasing is the fact that its being stretched that would explain the reason we think that the universe is speeding up is because we are in a spiral motion around something.

[@limbrendan1423]

There is one topic you have not touched on yet; Quantum String. Could you make a video on that?

[@mais.4982]

Would expansion ever reach a rate at which it overcomes even the strong forces and molecules eventually break down into atoms, or even quarks and electrons?

[@bilbobaggins3362]

until you observe it... then it can either default to one, or force the universe to split into two parallel versions of itself based on the outcome

[@LincolncentralNet]

Great video! ...but, Both the gravitational force between two masses and the electrostatic force between two charges are dependent on distance. both are proportional to the inverse square of the distance between masses/charges. This being the case, and space inflates, to keep the same forces the distances used must be the inflated distances. Otherwise these equations do not work. Why is it weird to think that matter inflates with time? Most of an atom is empty space. And space is expanding.

[@strrumz]

i saw an interview with him in his office/studio, he's got a bick stack of drawings stockpiled there.