The Arrow of Time and How to Reverse It

340 575 Näkymät

Sign Up on Patreon to get access to the Space Time Discord!
Ever wish you could travel backward in time and do things differently? Good news: the laws of physics seem to say traveling backward in time is the same as traveling forwards. So why do we seem to be stuck in this inexorable flow towards the future? It's time to begin our journey towards really understanding time.
Check out the Space Time Merch Store
Sign up for the mailing list to get episode notifications and hear special announcements!
Hosted by Matt O'Dowd
Written by Matt O'Dowd
Graphics by Leonardo Scholzer, Yago Ballarini, & Pedro Osinski
Directed by: Andrew Kornhaber
Assistant Producer: Setare Gholipour
Executive Producers: Eric Brown & Andrew Kornhaber
Special Thanks to Our Patreon Producers
Big Bang Supporters
Sean Maddox
Marty Yudkovitz
Brodie Rao
Scott Gray
Ahmad Jodeh
Radu Negulescu
Alexander Tamas
Morgan Hough
Juan Benet
Fabrice Eap
Mark Rosenthal
David Nicklas
Quasar Supporters
Justin Lloyd
Christina Oegren
Mark Heising
Vinnie Falco
Hypernova Supporters
William Bryan
L. Wayne Ausbrooks
Nicholas Newlin
Mark Matthew Bosko
Justin Jermyn
Jason Finn
Антон Кочков
Alec S-L
Julian Tyacke
John R. Slavik
Danton Spivey
Donal Botkin
John Pollock
Edmund Fokschaner
Joseph Salomone
Matthew O'Connor
chuck zegar
Jordan Young
Hank S
John Hofmann
Timothy McCulloch
Gamma Ray Burst
Daniel Jennings
Cameron Sampson
Pratik Mukherjee
Geoffrey Clarion
Darren Duncan
Lily kawaii
Russ Creech
Jeremy Reed
Max Bernard
Bill Blair
Eric Webster
Steven Sartore
David Johnston
J. King
Michael Barton
Christopher Barron
James Ramsey
Mr T
Andrew Mann
Jeremiah Johnson
fieldsa eleanory
Peter Mertz
Kevin O'Connell
Richard Deighton
Isaac Suttell
Devon Rosenthal
Oliver Flanagan
Dawn M Fink
Bleys Goodson
Darryl J Lyle
Robert Walter
Bruce B
Ismael Montecel
Andrew Richmond
Simon Oliphant
Mirik Gogri
David Hughes
Mark Daniel Cohen
Brandon Lattin
Yannick Weyns
Nickolas Andrew Freeman
Brian Blanchard
Shane Calimlim
Tybie Fitzhugh
Robert Ilardi
Eric Kiebler
Craig Stonaha
Martin Skans
Michael Conroy
Graydon Goss
Frederic Simon
Greg Smith
Sean Warniaha
John Robinson
Kevin Lee
Adrian Hatch
Yurii Konovaliuk
John Funai
Cass Costello
Geoffrey Short
Bradley Jenkins
Kyle Hofer
Tim Stephani
Malte Ubl
Nick Virtue
Scott Gossett
Martin J Lollar
Dan Warren
Patrick Sutton
John Griffith
Daniel Lyons
Kevin Warne
Andreas Nautsch
Brandon labonte
Lucas Morgan

  • Hmmm...if it's all relative, and only meaningfully so between adjacent slices of space/time, this would also explain why all observers mathematically aways agree on the spacetime interval. Observers would always be adjacent to each other on one of the axis, space or time.

    Anthony McKeeAnthony McKeeTunti sitten
  • So doesn't this mean that all life and the process of creating life is somewhat of an anti-entropy system? We attempt to store all the energy in one place while the universe is fighting against us to spread it out? Philosophically this would be double so for humans, as we are the only animal that "creates" on the scale we do, and all creation is an act of anti-entropy, ordering particles and ideas together that naturally want to decay and spread out without our direct intervention.

    Anthony McKeeAnthony McKee2 tuntia sitten

    Alison WalkerAlison Walker4 tuntia sitten
  • Does the time of an electron move slower than the nucleus of an atom? Does relativity have an impact here?

    rohail bootwallarohail bootwalla4 tuntia sitten
    • Wouldn't it be subjective to the electron only if it experienced the flow of time? Like how time moves at the same speed for humans as it does for flies but the flies experience it 60x slower?

      Anthony McKeeAnthony McKeeTunti sitten
  • I'm curious how wave function collapse would work in that backwards universe, I remember you talking about the relationship between time and interpretations of QM in the "Is the future predetermined?" episode

    Mr TemporalMr Temporal5 tuntia sitten
    • Probably the same. The wave function only really collapses in momentary localizations at the instant of measurement, with both its previous state and its state post measurement still in quantum superposition. We'll never be able to tell if the wave function collapse is an illusion of perspective or if the wave function is "infinitely collapsed" existing simultaneously at all points one could measure within the boundaries of the wave.

      Anthony McKeeAnthony McKeeTunti sitten
  • If the second law of thermodynamics is fully time-reversible, and we need something external to it to give us our arrow of time, could we get an independent arrow of time from the ‘collapse of the wave function’ as per the Copenhagen interpretation of quantum mechanics, which is truly irreversible? Is there a ‘many-worlds’ equivalent if so?

    londonclassicistlondonclassicist5 tuntia sitten
  • Does the reversibility of physical laws still work at the event horizon of a black hole? Particles only ever cross that boundary in one direction. Replaying the motion of a particle in reverse would result in it escaping the event horizon right? Oh wait... The black hole become a white hole when reversed...

    Lucas ThomasLucas Thomas7 tuntia sitten
  • sorry for the late question and slightly off topic- It is said we can't make anything go the speed of light. Yet whenever I turn on the lights, or strike a fire, I am creating light. Am I not making the chemical components of that match accelerate to the speed of light?

    Cmdr BacidCmdr Bacid9 tuntia sitten
  • if you consider spacetime particles, entropy is a constant. it turns out entropy is conserved. see for info.

    J Mark MorrisJ Mark Morris11 tuntia sitten
  • Can you explain ,,, what do we mean by understanding something. When do we say we understand something totally or can we ever understand something completely ?

    Ankit KumarAnkit Kumar13 tuntia sitten
  • Weird . Thank you, keep up the good work!

    Daniel HintonDaniel Hinton22 tuntia sitten
  • Our “now” is our inertial frame of “momentum” of the experience of time through the celestial space. Our memory/experience only can contain content from the direction/path we came from. What “was” has become what “is” and will become “what will be” in due time.

    Smile IfYouDontExistSmile IfYouDontExist23 tuntia sitten
  • I don't understand why everyone explains time in terms of entropy. A comparison: If I ask someone why my cake burned in the oven after 6 hours at 200 degrees and he replies that it was because all of the water in the cake has evaporated and is evenly distributed in the oven. Yes it sounds nonsensical. Because it was primarily the heat that was constantly generated by the stove and not the evaporation itself that led to the burning. What I mean by that, entropy is a result of time and not time in itself. I don't quite understand what time itself is either. But my guess is this: I suspect that time is the collapse of a probability wave. The moment following the present is like the moment just before a particle goes through the slits in the doubleslit experiment. That means in the future we are in a kind of superposition. There is a wave of probability that describes the second that is just ahead of us. The moment it collapses, we slide forward. And a new probability function is created for the second that follows. What is the reason for the observed entropy? If I am correct in the above conjecture, then the entropy results from the probability function. Since a particle will be in the most likely position in the future, it will always strive to be in a disordered state. Because a specific order is always less likely than disorder. If my suggestion is wrong, feel free to correct me.

    Ergün InciErgün InciPäivä sitten
  • All this dissection over a man made measurement based on the earth revolving around the sun. Time doesn't exist, it's a standardarized language explaining things that do exist. The inch is another explanation of this. The inch itself does not exist. It's a man made measurement. It only works if we all use the same distance. Why WOULD time care about direction? The inch doesn't care where it's used. Instead of using all these revolutions of the sun trying to find hidden secrets in moldable concepts, how about using some to get a more accurate measurement of the year.

    brandi minorbrandi minorPäivä sitten
  • Moon and Uranus conjunction on november 27th 2020 at Rio de Janeiro

    RG AstrofotografiaRG AstrofotografiaPäivä sitten
  • 11:11 What is it : ... -.. -... -.. -... -.. -... -.. -... -.. -... -.. @ 13500 Hz ?

    Samed SaffairSamed SaffairPäivä sitten
  • I dont get why at the big bang and shortly after entropy is supposed to be very low. Wasnt energy very randomly disributed while now it is very clustered?

    Jo DoJo DoPäivä sitten
  • #Tenet had Nobel prize winner Prof. Kip Thorne as an advisor.

    Prasanna PRSNPrasanna PRSNPäivä sitten
  • Matt, Why do you always present quantum choices as creating new universes AFTER the choice occurs? Isn't it equally probable that those universes existed the whole "time" and only become differentiable (sp?) at the time of the quantum choice?

    Joshua DeryJoshua DeryPäivä sitten
  • great vid babe

    abbsnn coseabbsnn cosePäivä sitten
  • plot twist: we are in the time-reversed universe, but experience everything in the wrong direction, only remembering the future, with no clue of the past. yet in the past we were able to remember more, ebcause there was still more future. For any given instant, it wouldn't make any difference.

    Alex TruskAlex TruskPäivä sitten
  • can i get around the second law of entropy without breaking the concept by just saying that there is never ever an isolated system?

    Alex TruskAlex TruskPäivä sitten
  • 👇

    Abu Azrael OfficialAbu Azrael OfficialPäivä sitten
    • What about irreversible chemical reactions?

      abbsnn coseabbsnn cosePäivä sitten
  • In the great entropy fluctuation scenario, would gravity being attractive on our side of the big bang singularity be just a lucky strike?

    Sasha BrennerSasha BrennerPäivä sitten
  • The point about entropy flow actually being independent of the direction of time in the block model was a fascinating clarifier I was not aware of. Mind boggling.

    Vikram GuptaVikram Gupta2 päivää sitten
  • If you reverse time, won't gravity be backwards?

    HallowizerHallowizer2 päivää sitten
  • "Time flies like an arrow, Fruit flies like a banana." --Unknown author

    aola wiliaola wili2 päivää sitten
    • God: A banana falls from the ceiling after spinning on the fan. *Splat* An orange falls from the ceiling *severe bruising* An apple: "Ight cool I'm just gonna let this float around in seeming defiance of the laws of physics"

      Partially Hydrogenated Safflower OilPartially Hydrogenated Safflower OilPäivä sitten
  • I’m currently on the toilet. If time moved backwards I would be very unhappy with this poop going back up my butt

    Benjamin FBenjamin F2 päivää sitten
  • 1:43 - Are you sure? What about the 3 body problem?

    zymezyme2 päivää sitten
  • 1:17 - "We remember the past but not the future" - Except for Merlin; he aged backwards and could only remember his future...

    zymezyme2 päivää sitten
    • Plot twist: The universe will stop expanding some day and then contract, via time reversing.

      aola wiliaola wili2 päivää sitten
  • If time runs slower were there is more gravity, would that mean that galaxies are "behind" the vast expanses of open space between them? Since we know satellites far from Earth need to be constantly adjusted to stay on "our" time, this would indicate the effect is cumulative. Could the emptiness of space be thousands of years ahead of galaxies and planets? Could the red-shift of distant light be the effect of time discrepancies as it moves through various "times"?

    Me WadeMe Wade2 päivää sitten
  • My favorite part of that "Another universes behind/(before?) the big bang flowing the opposite direction" is that, due to CPT-symmetry, it has the most delightfully satisfying solution to the matter-antimatter asymmetry problem I've ever come across. All the antimatter is just on the other side of the big bang!

    Cacophony ForeverCacophony Forever2 päivää sitten
  • Hi, Matt. Great episode! I would like to point out something which is very confusing to me in the way the standard argument (which you used here) of the reversibility of time at the microscopic level is carried out. It certainly works out if one restricts oneself to classical physics and quantum mechanics only. However, in our current best microscopic theory, the Standard Model which is a QFT, the chiral electroweak interaction explicitly breaks CP and hence time reversal. For instance this means that the scattering of 2 electrons shown in the video will not actually look the same under time reversal. Yes, this is a very small correction in this particular example, but it is very real. So doesn't this mean that the time-reversal symmetry is actually broken at the microscopic level? If this breaking has anything to do with the cosmological or thermodynamic time asymmetry would be another very interesting question.

    Vasily SotnikovVasily Sotnikov2 päivää sitten
  • I think this video explains it better: . If Matt would elaborate on the concepts introduced in this video. If only I could find the full video.

    John LeeJohn Lee2 päivää sitten
  • I am wondering if it is possible that gravity (or more precisely the way that mass warps space) could provide an arrow to time. Conveniently the 2-D particle demonstration you used didn't involve space that was warped at all. However, if gravity waves are a thing (as we seem to have recently discovered), and therefore it takes time for mass to warp space (even though it does so quite fast, likely at the speed of light), how can objects move in a deterministic manner when traveling backward in time. Surely the curvature of space due to nearby masses cannot be known before the gravity waves from those object reach the location. Unless some kind of reverse gravity waves are also possible where particles just move and then somehow later (earlier as we see it) nearby masses just happen to move to the correct location to give space the curvature it would have needed in order for those particles to have already traveled the paths that they did. That seems pretty far-fetched to me. It seems far more likely that mass's property of warping space gives time an arrow.

    Gabe HellerGabe Heller2 päivää sitten
  • if two quantum entangled particles would be separated, one stays on earth and the other will be orbiting around the black hole, and lets say we change the state of the black hole one with a certain interval. Would people on earth see the other particle change with slower interval?

    Viljar LonViljar Lon2 päivää sitten
  • Q: Are galaxies pushed by dark energy, considered to be in an inertial frame of reference with respect to the Milky Way?

    Rodrigo GarduñoRodrigo Garduño3 päivää sitten
  • What about irreversible chemical reactions?

    toughluck8012toughluck80123 päivää sitten
  • This video seemed to pose more questions than provide answers. I'm thinking I'm not the one who can answer these questions.

    TheOtherSteelTheOtherSteel3 päivää sitten
  • Yesterday I will tell myself what an amazing video I watched tomorrow 😁

    Hossein BeikmarzehHossein Beikmarzeh3 päivää sitten
  • It is 3am Eyes : let us sleep a bit Brain : wonder what time arrow is ? Me : 0_o

    ichsan rahmantoichsan rahmanto3 päivää sitten
  • What would happen if we could perceive higher or more dimensions?

    Moroni OteoMoroni Oteo3 päivää sitten
    • Fire 🔥

      doire aintudoire aintu3 päivää sitten
  • So in essence....... A black hole is a reverse time white hole? Is a white hole a low entropy state of the backward time universe?

    Mehul MishraMehul Mishra3 päivää sitten
    • it is, and it shall be what it used to be in the past ,in the future. Even if we escape our galaxy it will take longer to get to another galaxy than the universe has left to exist. Unless

      doire aintudoire aintu3 päivää sitten
  • 12:46 : Very well said.

    Matthew LindlerMatthew Lindler3 päivää sitten
  • Plot twist: The universe will stop expanding some day and then contract, via time reversing.

    Fay Anne Aura ArtsFay Anne Aura Arts3 päivää sitten
  • quantum mechanics means that if you reverse time particles won’t be in the same position or momentum

    Milan PintarMilan Pintar3 päivää sitten
  • I bet there are a lot of people who'd love that universe, where studying makes you dumber, being lazy doesn't decrease your wisdom, and binge drinking and claps on the head will make you smarter... relatively speaking.

    Dom SjukDom Sjuk3 päivää sitten
  • If time is the needle that sews the fabric of the universe then what is the thread? Would it be us humans? Or would it the the matter itself?

    Galax1eZGalax1eZ3 päivää sitten
  • is only tucked behind his ears.........

    Carol NortonCarol Norton3 päivää sitten
  • Traveling backward in time wouldn't be any different from traveling forward in time. No matter which direction you were traveling each instant would have the same past and the same future. No matter which direction at each instant you would have the same memories and your future fate would be the same. Each instant of time would have have the same previous instant and the same next instant. And since, by definition, the next instant would be next, traveling backward in time would instantly lead to traveling forward in time.

    MyOther SoulMyOther Soul3 päivää sitten
  • 👍🏻

    Luis GuevaraLuis Guevara3 päivää sitten
  • Im all for more time for time. Seize the time Meribor... #tngfans

    survivalizersurvivalizer3 päivää sitten
  • All I have for you is one word: TENET

    Israel Raizer CruvinelIsrael Raizer Cruvinel3 päivää sitten
  • please do not end this channle

    aneesh pooniaaneesh poonia4 päivää sitten
  • Isaiah 14

    IAM HEIAM HE4 päivää sitten
  • I was looking for cat massage videos, not sure how I ended up in this weird part of FIstream.

    Patricia BrownPatricia Brown4 päivää sitten
  • Hello Dr Matt and the team, a few question, for an episode ? Why are galaxies spinning ? Where does this energy come from and what choses the direction of rotation ? Does a Black home spins (from the inside) or just the matter around it twirls ? Why do particules spin ? Mass vs spin ? Spin vs information ? Does inflation spin ? If our universe would spin, could we see it ? Sorry my head is spinning upside down...

    Olivier ANDRIEUOlivier ANDRIEU4 päivää sitten
  • Nope, I call b.s. We are all plunging to the center of a gravity well that is located somewhere . It cannot be reversed. There, that's all I know. Things are the way they are, it is what it is, and it shall be what it used to be in the past ,in the future. Even if we escape our galaxy it will take longer to get to another galaxy than the universe has left to exist. Unless of course the inky vast nothing in-between galaxies is actually a vast natural worm hole that causes instant travel between galaxies. But if it worked that way everything would instantly fall in on itself and become a singularity again. It doesn't ,so it must not actually work that way.

    incog burritoincog burrito4 päivää sitten
  • In the Alchemy of Neutron Stars video you mentioned that it is is possible that everything we are made of was forged in a neutron star collision. If this is true where is the resulting neutron star or black hole from that now?

    dalek vaderdalek vader4 päivää sitten
  • Egg can reassemble when time go back

    Madasu RevanthMadasu Revanth4 päivää sitten
  • Ok I am confused by an apparent contradiction, or did I miss this - Why would we presume running time backwards, between any two points of time, means that all events and particles will do exactly what they did in reverse? To reverse reality in this way, means a knowability of all states and elimination of uncertainty - the complications of life and consciousness aside, arent we well passed the question of whether reality is probablistic at the quantumn level? How does changing the arrow of time circumvent that reality?

    Jr MJr M4 päivää sitten
  • So how does Infinitely dense singularity (Big bang) aligns with the laws of Physics and how does it is differ from the mythology of some God flying across the sky in a chariot ? Does it differ coz we call it scientific hypothesis? How come density be infinite ? Even if we consider that the universe was infinitely dense, how is it possible that it didn't have a volume, given that theory states that spacetime itself started after the big bang. If it had any volume then the spacetime existed even before the big bang. The creator theory also fails, because if god created everything then who created god and this chain goes on infinitely.

    Shrikant ChidgopkarShrikant Chidgopkar4 päivää sitten
  • Liked the video, thanks

    Changwe KundaChangwe Kunda4 päivää sitten
  • God bless this channel. I've been searching for a video about the arrow of time for a while and you're the only one yet.

    mikea hiooimikea hiooi4 päivää sitten
  • could someone (with a strong enough computer) plug the laws of physics into a simulator and when you eventually find earth you know you have all the right laws (along with the ability to see the past present and future in full viewable detail) like is it theoretically posible?

    a random commenta random comment4 päivää sitten
  • Watched it multiple times but still don’t understand how time is reversible at quantum level. If all particles at QL carry a high degree of uncertainty which disappears with ‘observation’, how would ‘unobserving’ look like when the time is reversed? To me it sounds like information had to be destroyed to make something uncertain :/

    UmitUmit4 päivää sitten
    • Seriously may be my favorite ever.

      mikea hiooimikea hiooi4 päivää sitten
  • Could you talk about relativistic thermodynamics?

    Undie CoverUndie Cover4 päivää sitten
  • So, okay, say there's an explosion, right? A big one, particles fly in all directions away from the epicenter for a very large distance. Say in a tiny fraction of a tiny debris of this explosion, a group of sentient monkeys develop consciousness. To these monkeys, their movement away from the blast is fixed - a(n apparently) constant velocity in a(n apparently) constant direction. Is that what time is, to us? If so, then the "mirror reversed" universe isn't actually moving "backwards" in time, it's just moving forward in their direction, in relationship with the explosion. Is that it? Am I tripping too much?

    Rafael Soares TorresRafael Soares Torres5 päivää sitten
  • I have a bit of a question. So if we flip directions of all particles, in theory, time flows backwards. But does it actually flow backwards, or is it flowing forwards but it's particles are returning to their initial positions? Is time an actual thing, or do we just define time as where entropy is increasing? Also, on the off note, if we could perfectly reverse every particle, would time flow backwards forever, or would fundamental randomness of particles and waves stop it after some time and make it flow forwards again, but from some position in the past?

    IridiumIridium5 päivää sitten
  • So glad you guys are spending more time on Time, my favorite subject.

    boo Jayboo Jay5 päivää sitten
  • Quantum Electrodynamics - qed. LOL

    Dan YxngDan Yxng5 päivää sitten
  • What about the other side of the big bang would have got most of antimatter? Can't the latter be described as matter coming backwards in time? ... And... coming from where, ehr

    bouligabbouligab5 päivää sitten
  • I watch this guy only to feel academic in terms of language expression...

    Radu MarianRadu Marian5 päivää sitten
  • There was an experiment about this that scientists running a simulation of three rotating black holes orbiting each other in a simulation and found that, after a point, when they tried to reverse the effective passage of time, they ended up getting different paths from how they moved up to that point.

    Evan NibbeEvan Nibbe5 päivää sitten
  • 9:37 is when my brain begin to (reverse) big bang before and after the point

    Raccoon GrrrlRaccoon Grrrl5 päivää sitten
  • So quick question, if time & space are actually spacetime...then isn't it self evident that you can't move backward in time? How do you have negative movement? I'm not talking about moving 'forward' in the opposite direction, I'm talking negative movement. It makes me wonder if the space distortion of a singularity is in fact the reason time seems to reverse, if the maximum speed is exceeded by the compression of space itself.

    EricMichaelManuelEricMichaelManuel5 päivää sitten
  • Hypothesis that time is just the fourth dimension of space (spot the pattern): +0 dimensions: point +1 dimension: continuous arrangement of points in a "line" with two 0-dimensional boundaries (left, right) +2 dimensions: continuous arrangement of lines in a "square" with four 1-dimensional boundaries (left line, right line, upper line, down/lower line) +3 dimensions: continuous arrangement of squares in a "cube" with six 2-dimensional boundaries (left square, right square, upper square, down/lower s., forward s., backward s.) +4 dimensions: continuous arrangement of cubes in a "moving cube" with eight 3-dimensional boundaries (cube moved to the left, right, up, down, forward, backward, cube at the first moment, at the last moment) (+5 dimensions: continuous arrangement of moving cubes/universes-with-objects-like-cubes-in-it in a "multiverse" with ten 4-dimensional boundaries (universe on the left, right, up, down, forward, backward, universe at the first moment, at the last moment, unnamed multiverse boundary one, unnamed multiverse boundary two) Any objections, thoughts, errors ? Thanks for considering.

    ThulybluThulyblu5 päivää sitten
  • Will entropy be calculated as a whole for our universe for all particles together or it will be seen for a group of object or group of molecules,atoms...??

    Prateek ChandPrateek Chand5 päivää sitten
  • There's a different world out there, Just past our universe. Life's the same as anywhere, But there time runs reverse. They know about the future, Have glimpses to the past. The present is a suture, Where first can become last. Born knowing how stories end, They read them to forget. While erasing ink with pen, They do not feel regret. We think of them with pity, While they unsettle Mars. They'll dismantle their cities, But we'll abandon ours.

    Wendy OdeskyWendy Odesky5 päivää sitten
  • i think arrow of causality and arrow of time are one and the same propagation, a property of space

    Jan SegalJan Segal5 päivää sitten

    doire aintudoire aintu5 päivää sitten
  • Ah yes,understanding time requires understanding of space time And space and time,why did I never think of that But legit,this was also an amazing episode Looking forward to next one

    Hiccup HaddockHiccup Haddock5 päivää sitten
  • Are weak force and entropy related ? both break time symmetry

    Likas PokasLikas Pokas5 päivää sitten
  • If there is no entropy, does time stop to flow...?

    Avinash DHAvinash DH5 päivää sitten
    • This is actually brilliant

      doire aintudoire aintu5 päivää sitten
  • Haahaha. The endings are pure genius :)

    Justin SolmsJustin Solms5 päivää sitten
  • What does fusion look like in reverse? Does physics says that would be the same, or even possible?

    johnsonmajejohnsonmaje5 päivää sitten
  • Maybe time goes reverse. We just don't know it, as we have forgotten it. All memories of the future has gotten erased as time travels backwards. If all vectors are reversed then our brain will be affected as well. Maybe past present and future happens simultaneously, and time is omnidirectional, but we can only observe and make sense of it in one direction, which leads us to think that time only moves forwards. You could have travelled nth time to your 10 year old birthday, but each time you do, you would think that you are just turning 10 for the first time. any memories beyond that haven't existed as far as the 10year old you is concerned. If that is the case, we would not even know if we kept doing the same thing over and over again or if we are able to change something.

    quertbarbie62quertbarbie625 päivää sitten
  • If time was going backwards, how could we even notice?

    UpAndOutUpAndOut5 päivää sitten
  • Why does no one think about the probability that we are riding a wave through time that "started" (for lack of a better term) at the "Big Bang" and resulting in "time" expanding in all temporal "directions"? The physical (uni)multiverse being "predetermined" along with time as every and anything that could be is, and the conciousness creating the ability to "choose" which path we experience. This theory would seem to indicate that as the velocity of time as we know it "slows down", we may (at some point in the distant future) be able to move through time in the same way we currently move through space. (As well as a whole slew of other concepts that could break the mind! lol)

    R.A. DragonR.A. Dragon6 päivää sitten
  • How do you get a lower zero than zero? Zero is zero, zero means nothing how do you get more nothing when you already have nothing 🤷‍♂️

    Nothing Is real!Nothing Is real!6 päivää sitten
  • How many dimensions does Imaginary time have?

    Roddy RichRoddy Rich6 päivää sitten
  • If someone actually found away to travel back in time. There are might be two or more options; 1. They are thrown back to the beginning of the universe. 2. The Quantum Multiverse interferes and puts them into another universe. Could anyone or Matt care to explain?

    Roddy RichRoddy Rich6 päivää sitten
  • At 7:20 - Comparing a low entropy particle cluster to the compressed state of our early universe isn't a good analogy, is it? As I understand, space was uniformly dense everywhere in our early universe. It was just more dense than it is today. There was never a super dense volume of matter contained within a larger empty space. Correct me if I'm wrong.

    Johnwill KeatingJohnwill Keating6 päivää sitten
  • I have a question. Do the anti particles use the same force carrier particles as regular particles? If not, are there anti photons carrying anti electromagnetic force?

    noaholtasnoaholtas6 päivää sitten
  • What do you think of this new paper published only a few days ago? Physicists discover the 'Kings and Queens of Quantumness' | Space

    Mike BrownMike Brown6 päivää sitten
  • Would the universe exist if there was no one there to see it? :D

    Mister NobodyMister Nobody6 päivää sitten
  • Time is not an arrow. It's now how we think of it or perceive it. It doesn't move "forward". Life isn't some video tape that can be rewound or fast forward. Life isn't linear, it's chaotic. The atoms around us are wiggling around randomly, it's our minds that create the illusion of order and structure. We're experiencing a randomness that we are simply accustomed to.

    Mad Mental HibbyMad Mental Hibby6 päivää sitten
  • What if the universe bounces from big bang to big crunch and at each time a coin is flipped and the result is who win in the amount of matter vs antimatter, creating a symmetry between a matter universe and an antimatter universe?

    Guénaël SoumGuénaël Soum6 päivää sitten
  • "Time flies like an arrow, Fruit flies like a banana." --Unknown author

    doliio volaydoliio volay6 päivää sitten
  • Aliens 👽 are just humans travelling back in time!

    Callum BushCallum Bush6 päivää sitten