Do You Expand With The Universe?

As the universe expands, #expanding #space is said to "stretch" photons. But if it stretches photons, does it also stretch molecules, galaxies and you? A portion of this video was sponsored by Salesforce. Go to to learn more.
Special thanks to Geraint Lewis - this video was based on his paper "On the relativity of redshifts"
Check out his ALthe channel: and books:
Expanding Space: the Root of all Evil?
Matthew J. Francis, Luke A. Barnes, J. Berian James, Geraint F. Lewis
Editing and VFX by Trenton Oliver
Thumbnail by Ignat Berbeci
Music from
#SMB #smallbiz #startups #SalesforceEssentials


  • SilverTiger1981
    SilverTiger198111 orë më parë

    I have to disagree. If you say that space expands, giving it a definition whereby a specific geometry or grid is assigned to divide its volume into sections, then mass must also conform to that grid of measurement. But you're saying the opposite. You are defining a realm of existence, one that matter does not have to conform to. Doesn't that strike you as...odd? Mathematics yields an expected result based on repeated observations, but they cannot tell you WHAT is going on, and so you always end up guessing without evidence. Observations can mislead you, no differently then how the observers of the past witnessed ships falling over the edge of the earth - because that's what it looked like to them. At LEAST they had that going for them - the fact that they were describing something they observed the best way they knew how. And yet, scientific observations SCREAM a very round, nonhomogeneic and anisotropic universe, and yet cosmology has fought tooth and nail AGAINST what they were seeing simply because they did not like the implications of it. The flat earthers could even write equations to describe how long it would take for a ship to completely disappear, and from that calculate how fast the water was flowing over the edge, assuming that the ship was not under power, and so on. There are only two differences between cosmology and flat earth theory: one is that cosmologists say that the ocean and every unseen thing inside of it was expanding between the observer and the ship, without that expansion affecting the ship and the observer, so as to yield a measurable result; the other is that where flat earthers claim the earth is flat, cosmologists claim that the UNIVERSE is flat. That's quite convenient, isn't it? It's about as convenient as Lorentz's contraction of length was in the day of Michelson and Morley. Without evidence, the math is meaningless, and at that point it is merely philosophy born from a fantasy. Jussayin. :)

  • Martin Verrisin
    Martin Verrisin16 orë më parë

    if all atoms were also expanding, we wouldn't see any expanding :D

  • Martin Verrisin
    Martin Verrisin16 orë më parë

    ACTUALLY, I believe something else: The universe is not expanding: atoms and particles are *_shrinking_* - Why? Because *Big Bang* - look at any explosion: it has little specs that get smaller and smaller. The whole universe is just an explosion, and all little bits are slowly dying out.

  • Martin Verrisin
    Martin Verrisin16 orë më parë

    what absurdly complicated universe, just so we can look at pictures of kittens....

  • ilhandurmus
    ilhandurmus21 orë më parë

    If there is two object in space and you are looking from the third point . And if we call object one A and object two B and you C if C become close to A and B relatively you will feel that A and B is becoming more far to each other so what Hubble found is not proof of expanding space and also receiving lights are later doesn’t mean also space is expanding .. maybe space is shrinking and that’s why density become high and light moves slower and also because space is shrinking maybe we are becoming more close to space objects that’s why we feel as if they are becoming fed to each other

  • SDRIFTER Abdlmounaim
    SDRIFTER AbdlmounaimDitë më parë

    oh am expanding everyday, with or without the universe's consent 😂👀

  • 3pharaohstowers
    3pharaohstowersDitë më parë

    Yes you expand because your quantum expands Your perceived difference is insignificant we are all made of star dust. Welcome to the infinity universe.

  • Mike Clemo
    Mike ClemoDitë më parë

    My rate of expansion has been easily observed since I was 35.

  • Willow
    WillowDitë më parë


  • Alexand Human
    Alexand HumanDitë më parë

    "If you were put into deep space, then would you expand? The Answer is No." [Insert Well Yes, but actually No! Meme] The Universe won't expand you because of it's expanding, it being a vacuum will do that for you

  • Vaclav Blazek
    Vaclav Blazek2 ditë më parë

    After months of lockdowns and curfews I've found myself, well, expanding. However, I'm affraid it has nothing to do with cosmology. Unfortunately.

  • Paul
    Paul2 ditë më parë

    So like do we exist or na?

  • mokiloke
    mokiloke2 ditë më parë

    But what about over cosmological time. I would assume that a cube of matter in space would expand as eventually it would become more substantial than the inter molecular forces?

  • ximal popoca
    ximal popoca2 ditë më parë

    It depends on the kind of diet you follow 😋😋😋

  • TazTalksYouListen
    TazTalksYouListen2 ditë më parë

    According to my red-shifting bathroom scales, I've been expanding exponentially for decades. I'm not proud of that, either.

  • mike nag
    mike nag2 ditë më parë

    Plz explain how big is our universe?? Our universe can hold so many countless planets and stars but it have end since universe is gas only .... Plz explain.

  • Martijn Kasper
    Martijn Kasper2 ditë më parë

    Isn't the assumption of the Big Rip Theory that dark matter will overcome gravity and rip individual atoms apart? Wouldn't this be the same phenomenon as red shifting?

  • Tawing dela Rama
    Tawing dela Rama3 ditë më parë

    So if we galaxies are not expanding then what is expanding then?

  • Schockz
    Schockz3 ditë më parë

    Dont know if it is a dumb question but, as far as i understood the galaxys itself are not expanding. Nothing is stretching on them. What about "the big freeze". Isnt that a therory that is kinda accepted?

  • BovineJonie
    BovineJonie3 ditë më parë

    That thing you stretched that changed color...was that an effect or did that thing actually change colors?

  • Arunmanikandan M
    Arunmanikandan M4 ditë më parë

    The thing is you cannot observe a photon that is not coming to you

  • Pelza
    Pelza4 ditë më parë

    What would happen if you shot a proton inside a spaceship going at light speed would it go faster then light probably not but idk

  • Medusa Skull
    Medusa Skull4 ditë më parë

    What if everything is expanding relatively based on mass, 9.8m/s^2 on earth. The reason we can't detect it is b/c our measuring instrument is also expanding at the proportional rare? And that's where gravity is from. 😀

  • Vinny T
    Vinny T5 ditë më parë

    @1:22 We are taking a look so far into the galaxy and suddenly find a past, younger Derek.

  • Rum and Bass
    Rum and Bass6 ditë më parë

    i'm in my 30s so yes i am expanding.

  • GeneticFreak
    GeneticFreak6 ditë më parë

    No but your mom is

  • Search engine
    Search engine6 ditë më parë

    you said our galaxy is also moving with the expanding of univers.but wich side left/right/up or down .or curving ..or how .........? if the whole univers is expanding ..then some how there is a side ,that the way ,like left side galaxies are expanding to left side ,same as right /up/and down............ so its okhy im expanding left side so if i wanna see a galaxy to the right side ..then i might see its getting a way from us its expanding ... . .. but....if we see every galaxies are expanding around our galaxy .......why dont you thing we are staying in a same place

  • Robert Beaman
    Robert Beaman7 ditë më parë

    This is the day of the expanding man...

  • KuurP
    KuurP7 ditë më parë

    I think the thumbnail is a meme itself.

  • Мариос Христодулу
    Мариос Христодулу7 ditë më parë

    I'm surprised to hear that the common explanation for the cosmological redshift is that light itself gets stretched out. I have actually never heard that explanation before. The only one I've ever heard is the one that involves the Doppler shift due to far away galaxies moving away from us due to the expansion of space.

  • Muralha
    Muralha7 ditë më parë

    My wife is expanding with the universe.

  • Akshai Kumar
    Akshai Kumar7 ditë më parë

    Love your videos

  • John B
    John B7 ditë më parë

    Love the Pampers commercial just after he says "Except for very extraordinary circumstances." Not sure if that was planned but it gave me goosebumps.

  • S Fouche
    S Fouche7 ditë më parë

    Let's see how you %$#@ up my head today.

  • Thạnh Phạm
    Thạnh Phạm8 ditë më parë

    Every second the Sun emits billions billions billions ^ billions 0,1 volt lightning create sunlight. 1 positron + attracts 1 electron -- create lightning 0.1 voltage. Positrons and electrons -- rotate very rapidly after 46 billion years of creating the Sun ' s core, so the core of the Sun rotates very quickly like A super large electric turbine that produces super large electrical energy Every second the Sun emits 4,1million tons electricity create sunlight, sunlight moves the circle back to its original position after 8 hours, so pushes the 8 planet and the Earth to rotate in order

  • Thạnh Phạm
    Thạnh Phạm8 ditë më parë

    Jupiter grows to create the Sun Earth is about to have two Suns Earth is constantly expanding, Evidence is that Hawaii volcanic lava is constantly erupting, Jupiter ' s magnetic field is 20 times stronger than the Earth, so Jupiter expanding is 20 times faster than Earth, Jupiter future grewup creating the Sun The universe just expanded like the Earth

  • Leoster Banzon
    Leoster Banzon8 ditë më parë

    if the observer watch the redshift and he just and become a free falling observer, he will see that its from green/red to back to blue.

  • GeoDrone
    GeoDrone8 ditë më parë

    Well if the contents of space were expanding with the space, there would be no noticeable expansion. But, since atoms are mostly empty space, I wonder if you are correct about that?

  • wills movies
    wills movies9 ditë më parë

    So if the Universe is expanding, what is it expanding into? And would an expanding Universe make space travel to other Stars unattainable because they are travelling away from us ?

  • Jonathan Bar Or
    Jonathan Bar Or9 ditë më parë

    If you could tie a rope between two galaxies that are moving apart, would the rope experience forces affected by the expansion of the universe?

  • Peter Nicholson
    Peter Nicholson11 ditë më parë

    Help me out here.... if the distance between galaxies is expanding, surely the space between the stars within a galaxy must also be expanding. There is no difference between intergalactic space and interstellar space... and neither are held together with the electromagnetic force.

  • Marcos Paulo
    Marcos Paulo11 ditë më parë

    Veritasium, i don't agree with you in the argument, but I believe the hypothesis that the universe is not expanding is very plausible and could be tested.

  • Eugene Saint
    Eugene Saint12 ditë më parë

    Yes, you are expanding with the Universe. The Earth is expanding. The Earth is bigger than you so the Earth wins -- therefore you have weight. You are not attracted to the Earth, owing to some mystical magical force but rather are repelled by the Earth's expansion. Gravity, as we are taught to understand it, is an old wive's tale; an easy way to explain the fact that we have weight. In reality, there's no such thing as Gravity. Theories based upon gravitational waves, gravitons and such are simply false. It brings to mind a bunch of academics standing on the beach theorizing on why the Earth appears round when they know damn well it's flat. The real question is not -- When I drop something, why does it fall to the floor? But rather -- Why does it stop when it gets there? All of the math functions used to describe the force of "gravity" still apply, IF you precede them with a minus sign. The bottom line is: The apple didn't fall on Newton's simply came loose and Newton ran into the apple. If you understand this, you should have no problem explaining the tides. (Hint: Newton's First Law...) Everything about gravity is repulsive. :^) Saint

  • Player Raja
    Player Raja12 ditë më parë

    Lol the thumbnail is appropriate but funny 😁😁

  • Jaface
    Jaface12 ditë më parë

    I feel uneasy watching these videos, but then I realize these are all just theories that physicists just use to make their math work while attempting to make sense of smaller observations. One day we may observe something that contradicts these theories, and new ones will be formed to replace them. It's a sort of generalization fallacy where we're making sweeping assumptions about the universe based on what we can see from earth. In the end we're limited by technology and the physical limitations of our bodies' senses from getting the the full picture.

  • Prtj Pmr
    Prtj Pmr13 ditë më parë

    Dude can look at photons, what the hell.

  • Çılgın oyuncu
    Çılgın oyuncu13 ditë më parë

    Yeah, the bigger you are, the smarter you are

  • Samuel Mason
    Samuel Mason13 ditë më parë

    Look, im no orthodontist.... im not even a pool guy--- but im pretty sure its space thats expanding because we're moving due to the big bang.... the particles just lose energy i take it. Idk' like i said, im barely a lobster fisherman.

  • John Tonelli
    John Tonelli14 ditë më parë

    Well if you haven't heard the universe is NOT expanding. Just sayin

  • John Tonelli

    John Tonelli

    14 ditë më parë

    @gotanygrapes831 look up thunderbolt chanel it's all spelled out in about 4 videos.nasa is starting to turn to electrical from gravity

  • gotanygrapes831


    14 ditë më parë


  • I am fucking your waifu and there's nothing you can do about it
    I am fucking your waifu and there's nothing you can do about it14 ditë më parë

    I get thiccer with the universe

  • Petr Kulhavy
    Petr Kulhavy15 ditë më parë

    2021 "I am not fat I am just expanding with the universe"

  • JJ eLz
    JJ eLz15 ditë më parë

    I didn't get fat during COVID I just expanded with the universe

  • Salman Nakhwa
    Salman Nakhwa15 ditë më parë

    Me looking at my stomach: Yes, i m Expanding.

  • Mad Harambe
    Mad Harambe15 ditë më parë

    Also if it did stretch us then it means that the universe wouldn't be seen as expanding because we are also expanding with it.

  • Mad Harambe
    Mad Harambe15 ditë më parë

    My hypothesis from the thumbnail is that Veritasium has a big head

  • Zain Khalid
    Zain Khalid16 ditë më parë

    So my text book lied.

  • buzz magister
    buzz magister16 ditë më parë

    My guess would be no or we would not notice any expansion as the stars galaxies and everything would expand so everything would look relatively the same .

  • Junzenry Moreno
    Junzenry Moreno16 ditë më parë

    Veritasium's catchphrase: Well, the answer is No.

  • elder bastard
    elder bastard17 ditë më parë

    well, I do, but that's because I'm currently eating directly out of the ice cream carton

  • Mr. Intercore
    Mr. Intercore17 ditë më parë

    Me eating several microwaved burritos while watching this: "oh, im expanding alright"

  • Henry Lyman
    Henry Lyman17 ditë më parë

    How can someone outside the rocket observe a photon remotely?

  • WuzNab
    WuzNab17 ditë më parë

    I'm not fat, I'm just expanding with the universe.

  • Thienbaoguonghung Truonghoangtrung
    Thienbaoguonghung Truonghoangtrung17 ditë më parë

    The unruly doll spectacularly rejoice because soap characteristically glue to a black church. enthusiastic, squeamish rub

  • jamcdonald120
    jamcdonald12018 ditë më parë

    VE: What is redshift? Well it is not 1 thing its 3 things also VE: Well not 3 things, 2 of them are the same Also VE: ok, all 3 of them are the same

  • ButlerHives
    ButlerHives18 ditë më parë

    I'm not fat, I'm expanding with the universe.

  • Abdull Khan
    Abdull Khan18 ditë më parë

    photon should blue shift to the stationary space observers in the thought experiment ☝🏽

  • Carlos Gonzalez
    Carlos Gonzalez18 ditë më parë

    I must confess I was not convinced (or didn't understand) the jump between the cosmic fluid and the non homogeneous situation. How space expands in one situation and not in the other; space expands or does not expand. I see however that when forces apply the bodies may not expand as these forces keep them 'tight'. Still I have a feeling similar to when I heard about the ether, we seem to invent an all filling substance to explain an observation. I always understood space as a reference/mathematical invention to place the observed phenomena, so I find hard to use its expansion to explain anything. Anyway I really appreciate that you add references to you video so anyone can explore the topic by him/herself, that is a very good sign!

  • JonTay D. Sims-Peterson
    JonTay D. Sims-Peterson18 ditë më parë

    Our bodies are held together by the word of Christ. He is the reason we have being and we move. I love your videos though i appreciate the science, it agrees with God. I'm curious though, through all of those answerable questions have any given answers, i personally think humans have just guessed what's what because well one again GOD! Observers and space expanding galaxies and comic soup. Everything the Bible says it's true. Science agrees with truth. Video content suggestion go!!!

  • James Gilhome
    James Gilhome18 ditë më parë

    How come I've been expanding as I get older then 🤣🤣🤣

  • AJ Hieb
    AJ Hieb18 ditë më parë

    I know it's a thought experiment, but am I missing something? Regardless of whether the rocket is transparent or not, how could the outside observers "observe" a photon that isn't moving in a path that ever intersects with any of the observers? Even if we're talking about a stream of photons and the observers are some sort of light detectors, either the external observers are going to have no photons to detect (if the source was a laser aimed at the top of the rocket) or it will be detecting _different_ photons (but from the same source) as the detectors on the rocket. Right?

  • Jérémy Gagnon
    Jérémy Gagnon18 ditë më parë

    I lost my last two brain cells 😅

  • Jituno Wikai
    Jituno Wikai18 ditë më parë

    Finally a question I have at 1 am have a video.

  • Lord Peanut
    Lord Peanut18 ditë më parë

    The last explanation; ie the equivalence between the doplar shift and cosmological red shift needs a better explanation. It appears to be saying that if we find a set of observers so that the direction of their movement is all away from the same point then what is really cosmological redshift from the point of two distant points will appear to be Doppler red shift from the point of view of two near by points. Why? How do you know that cosmological redshift occurs at all and that space time is not just a flat thing with galaxies zipping around like gas molecules in a balloon and your though experiment only works because you picked the right molecules with the right velocities?

  • Phaeton Rudegar
    Phaeton Rudegar18 ditë më parë

    If frequency is not an inherent property of the photon, and string theory, then frequency is not an inherent property of string theory which is all about vibration and therefore frequency. So string theory is not based upon the inherent properties of the universe. So string theory does not directly address the root structure of reality.

  • Steve Pax
    Steve Pax18 ditë më parë

    sorry, completely unconvincing

  • Offensive CommonSense
    Offensive CommonSense18 ditë më parë

    Judging from my Pre-Sc@mdemic and Post-Sc@mdemic physiques ... the answer is YES , 100% .

  • NeuralBrew
    NeuralBrew19 ditë më parë

    Is space expanding or is time contracting? How could we ever tell?

  • Dillinger
    Dillinger19 ditë më parë

    How does or doesn't this relate to The Big Rip?

  • Saul Savelis
    Saul Savelis20 ditë më parë

    you missed the real reason of the red shift and mentioned only Doppler (others are just delusions)

  • Saul Savelis
    Saul Savelis20 ditë më parë

    equivalence principle only applies when you are attached to the ground, the rest is not equivalent since gravitational field is missing

  • Andrew Bledsoe
    Andrew Bledsoe20 ditë më parë

    "Why is this red?" That.. was adorable

  • Bradley Blake
    Bradley Blake21 ditë më parë

    If the universe is expanding that means it has to be expanding inside of something. So what is the universe expanding inside of? It almost makes me feel like this theory is incorrect. Wouldn't it actually make more sense for everything inside of the universe to be slowly expanding away from eachother inside of an infinite universe? Or are we part of a universe that is part of something much larger in which it is expanding inside of? And if so why are there no theories (I've ever heard of) surrounding this? Because one does not make sense without the other, in my opinion.

  • Darolaho
    Darolaho21 ditë më parë

    So if i am understanding this correctly. Does that mean the idea that in the far far future the universe will have expanded so much that the distance between galaxy clusters is further away from each other that they are outside of their own observable universe is false?

  • Akram Safirul
    Akram Safirul21 ditë më parë

    "what would a free falling observer, see?" Probably their life flashing before their eyes

  • y45 oı
    y45 oı21 ditë më parë


  • Aadhira Bhagya
    Aadhira Bhagya22 ditë më parë

    We see red shift only when we move relative to the source.assuming if I see the universe from outside the universe(imaginary place) i think I can't see red shift is this correct😊

  • Lauren Moore
    Lauren Moore22 ditë më parë

    That dude falls off of buildings a lot.

  • Andrew J. Santucci
    Andrew J. Santucci22 ditë më parë

    You still have one of the best audio loops in all youtube

  • hattori hanzo
    hattori hanzo23 ditë më parë

    if is universe expanding, why my 100 years old home is 2 rooms still? it sould be 3 rooms for now. at least. 🤪

  • ravi
    ravi23 ditë më parë

    only fat people do

  • JD Russell
    JD Russell24 ditë më parë

    Meanwhile the 13.7 billion years old black hole spews out MORE ATOMIC PARTICLES TO FORM MORE STARS

  • SCP Time

    SCP Time

    23 ditë më parë

    They decay into quantum particles, unnconected and short lived. Not sure what you mean here. Super and hyper novae, which form black holes, do release higher atomic nuclei.

  • JD Russell
    JD Russell24 ditë më parë

    Or were Shrinking? Perhaps Greater Mass is Outside the universe and God will introduce that material ALL AT ONE TIME? Like a tidal wave water moves off shore first.

  • Aaron
    Aaron24 ditë më parë

    I got it human being is expanding if you look carefully human beings are bigger or fat than before lol

  • simon wang
    simon wang24 ditë më parë

    The silky archeology ironically guard because light postauricularly reflect around a draconian pimple. measly, wealthy turkish

  • Kaushal Joshi
    Kaushal Joshi24 ditë më parë

    So Thanos snapped and electrostatics forces binding together subparticles to form an atom got lost.

  • Handsome Rob
    Handsome Rob25 ditë më parë

    In the cable world we call this attenuation

  • Jordan Ace
    Jordan Ace25 ditë më parë

    The typical voice puzzlingly produce because actor immuhistochemically wave upon a old-fashioned peer-to-peer. quixotic, aware freighter

  • Alwin Joseph
    Alwin Joseph25 ditë më parë

    6:25 Adam Ragusa has entered the chat

  • N Hansen
    N Hansen25 ditë më parë

    Looking at the title I'm thinking sure, sounds reasonable. I'm certainly expanding as I grow older. The downside is my gut and hips seem to be expanding faster than the rest of me. XD

  • Roman Cieciak
    Roman Cieciak25 ditë më parë

    There's one question about red shift and accelerating expansion of the universe that keeps bothering me: Wouldn't observing galaxies billions of light-years away expand faster suggest that the universe was expanding faster billions of years ago? In context of the video, most of the red shift would happen early on, when the universe expansion was accelerating dramatically. Anywhere i looked doesn't seem to address this, or I'm a dummy

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