Did Time Start at the Big Bang?

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  • تم نشره في 2019/07/18
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    Our universe started with the big bang. But only for the right definition of “our universe”. And of “started” for that matter. In fact, probably the Big Bang is nothing like what you were taught.
    A hundred years ago we discovered the beginning of the universe. Observations of the retreating galaxies by Edwin Hubble and Vesto Slipher, combined with Einstein’s then-brand-new general theory of relativity, revealed that our universe is expanding. And if we reverse that expansion far enough - mathematically, purely according to Einstein’s equations, it seems inevitable that all space and mass and energy should once have been compacted into an infinitesimally small point - a singularity. It’s often said that the universe started with this singularity, and the Big Bang is thought of as the explosive expansion that followed. And before the Big Bang singularity? Well, they say there was no “before”, because time and space simply didn’t exist. If you think you’ve managed to get your head around that bizarre notion then I have bad news. That picture is wrong. At least, according to pretty much every serious physicist who studies the subject. The good news is that the truth is way cooler, at least as far as we understand it.

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تعليقات • 5 285

  • Vantage Point
    Vantage Point 5 ساعات قبل

    I think our friend should have used lines of latitude instead of longitude in his analogy. Longitude is the imaginary line circling the Earth in the East-West direction. Latitude is the imaginary line from the equator to the poles. The longitudinal circles shrink as they get nearer the poles. The latitudinal lines converge as they approach the poles.

  • The1CelticTiger Stuff
    The1CelticTiger Stuff 11 ساعات قبل

    I'm assuming this guy finished high school

  • Ryan Duncan
    Ryan Duncan 12 ساعات قبل

    Which way did the big bang "come from"? I'd the cmb still coming from the same direction?

  • Rosolino Lo Sciuto
    Rosolino Lo Sciuto 14 ساعات قبل

    La rotazione terrestre sta rallentando e' ne corrisponde per primo l'universo

  • Ro nald
    Ro nald أيام قبل

    Wow that is trip-pie graphics sublimating a trip-pie notion.

  • Cesar Miranda
    Cesar Miranda أيام قبل

    Humans don't even have the knowledge to keep this planet alive...
    How is it possible to humans to explain by a childish conclusion that there was a "big bang"?
    The answer is: No, we don't have any knowledge for that!!!
    And definitely there wasn't a "big bang"!!!
    Maybe the universe is not expanding... Maybe it's just passing through another universe, as much as Andromeda galaxy will do with the Milky Way!!!
    We definitely don't have all the answers we think we have...
    The human race is so idiot...

  • Manly Man
    Manly Man 2 أيام قبل

    Short answer: we have no idea. And never will.

  • derrenk
    derrenk 2 أيام قبل

    I was about to go to bed some bloody hope of that now, thanks PBS :P

  • Amateur Workout
    Amateur Workout 2 أيام قبل +1

    T for Time : no for T-shirt
    S for Space : no for Shave

  • Stephen Hill
    Stephen Hill 2 أيام قبل

    wheel

  • Stephen Hill
    Stephen Hill 2 أيام قبل

    tine is a human concept we invented it to measure movent, we could measure hight with length, weight (mass) but how to measure movement. man started with the sun. then the moon then stars, clocks need some kind of movement or they can not measure time be it the swing of a pendulum twist of a balance week the vibration of quarts or the movement of cesium atoms. we need to measure time but the universe does not

  • Lala Lala
    Lala Lala 2 أيام قبل

    So time is just another longitude/latitude.

  • fynes leigh
    fynes leigh 2 أيام قبل

    the Universe-by definition, cannot "start", anymore than you could get outside it. The universe -or everything, could not possibly have a start or beginning.That is a clear example of a definitional impossibility, and no more can it expand-by definition you cannot have*more* everything.

  • N English
    N English 3 أيام قبل

    theories are fun

  • Chris Laflamme
    Chris Laflamme 3 أيام قبل

    If they just realize that our “universe” is the outcome of the opposite end of a black hole then we can quit making videos that waste what time we do have

    • fynes leigh
      fynes leigh 2 أيام قبل

      No, the universe just *Is*. It has always been and always will be, or it is not the universe.

      Broadly speaking you can divide the population into those for whom that is screamingly obvious and those for whom it isn't.

  • Victor Johnson
    Victor Johnson 3 أيام قبل

    If a grandfather clock strikes midnight in an empty void, does anyone here the chimes?

  • Dyke Davis
    Dyke Davis 3 أيام قبل

    A billion light-years is infinite compared to human ability to travel to this point in space-time and the rest is mere theory or waste of time.

  • Dyke Davis
    Dyke Davis 3 أيام قبل

    The hypothetical being of time...thaaa!

  • WfB.Subtraktor
    WfB.Subtraktor 3 أيام قبل

    what if the geodesics go out the other side in the form of an anti-matter universe going backwards in time?

  • carpe diem
    carpe diem 3 أيام قبل

    What created the singularity?
    What caused it to explode and why when it did??
    What was there before the singularity and what surrounded it...ha, gotcha
    Hello God

  • Mj Burger
    Mj Burger 3 أيام قبل

    I don't understand what makes educated people make the claim that the universe is infinite. It's telling us we don't have the picture right. Infinity is theoretical as far as the physical world goes, we never see anything infinite. Claiming there was "nothing" before the big bang is equally absurd. These ideas seem more like religion than hard science. But what do I know, I'm just a stupid dumb idiot. DAVID !!

  • VodShod
    VodShod 3 أيام قبل

    matter black hole + antimatter black hole = big bang?

  • GrimJerr
    GrimJerr 3 أيام قبل

    At the highest Dark Matter Dimension we could lay out a timeline and call it Mega time which would Encompass all formulas in which a baryonic type Universe could exist within its Dark Matter parent

  • GrimJerr
    GrimJerr 3 أيام قبل

    Did Time start with the big bang ?
    No, Time is Local, and in so many ways. "Bangs" are reoccurring and multi dimensional. That is our Universe exists within a higher dimension with an infinite number of probable Universes in an infinite sea of dark matter.

  • Phinneus Prune
    Phinneus Prune 4 أيام قبل

    My theory is a simple one. Physics works within the box we call the Universe. So what do I believe the Big bang is?
    The introduction of existence within non existence and the rapid expansion is existence being the dominant force against non existence. No mathematical equation will solve this one because physics does not apply to what is outside the box. What is outside the Box? Non existence. The break down of space and time and all matter. I fear that in the end ... Nom existence will win out when eventually the Universe tears itself apart being there is no force to hold it together from expanding to oblivion. So to reiterate ... Big Bang. The introduction of existence to non existence. Existence expands into the expanse of non existence. I shouldn't call non existence an expense because non existence only exists because space, time and matter have been introduced which in turn turned nothing into existence. And space and time eventually stretches and tears and the end of existence as we know it.
    This is probably the most ridiculous theory anybody ever said. And I may be stupid for even have said it. But in the end ... my theory is just as ridiculous as any scientists theory. This is one of them things we think we might know. But will never know. Because we only understand existence ... or at least we think we do.
    And this is why I believe in God. It is just too perfect.

  • Gabriel Meneses
    Gabriel Meneses 4 أيام قبل

    👏👏👏👍👍👍👍👌Great lesson Sir.

  • Tyler Bommarito
    Tyler Bommarito 4 أيام قبل

    People are so quick to assume that the big bang contradicts christianity

  • Jeff Hellyer
    Jeff Hellyer 4 أيام قبل

    Great video, Matt, very cool. Mind-blowing concepts and interesting math. Thanks. And I hope you won't mind (I don't mean to spam!), here are some other very quick thoughts around the issue of when time began, in this music video I just made, called "When Time Began" (3m44s): arclip.net/video/VW6LAIslRMU/فيديو.html

  • Thomas W
    Thomas W 4 أيام قبل

    In the beginning God.......

  • Michael Spoto
    Michael Spoto 4 أيام قبل

    i barely learned how to do PEMDAS.......i have a feeling im gonna be so lost in this video.

    • Michael Spoto
      Michael Spoto 2 أيام قبل

      @fynes leigh that didn't make much sense.

    • fynes leigh
      fynes leigh 2 أيام قبل

      Perhaps you should have a bash at speaking English or at least trying to write it.

  • Planepants Games
    Planepants Games 4 أيام قبل

    I think we are flowing backwards in time, and the big bang is the end of the universe collapsing into a black whole ☘

    • Planepants Games
      Planepants Games 2 أيام قبل

      @fynes leigh Yeah, that shamrock was supposed to be a weed leaf. Don't you agree? Was is that obvious?

    • fynes leigh
      fynes leigh 2 أيام قبل

      When you encounter an effect preceding a cause then you can say that time is flowing backwards and not before. You don't have a degree, do you? - And yes, it is that obvious

  • Anton Nb
    Anton Nb 4 أيام قبل

    Zero dimension ..so does hell actually exist?

  • NecroMelodia
    NecroMelodia 4 أيام قبل

    Tl;dw: prolly godd lel

  • Artist Floating
    Artist Floating 5 أيام قبل +1

    Happy 2020 75 wishes 16 dewdrops💓💓💦🌊😃💧

  • Channel 27
    Channel 27 5 أيام قبل

    The Big Bang in my book is the day this reality was turned on. And the matrix was born from the other side of the firmament. Few will get it but there it is.

    • fynes leigh
      fynes leigh 2 أيام قبل

      Exactly as there is only one universe there is only one reality, and if you understand that you will understand your complete aloneness or isolation.

  • Krumple Themal
    Krumple Themal 5 أيام قبل

    You can't create time without time first existing. You can't go from a moment without time to a moment with time. You HAVE to have time first. An event can never occur without time first existing. You can't have a big bang where time "begins" then. It's impossible.

    • Krumple Themal
      Krumple Themal 5 أيام قبل

      @Bob Artor Yes time would have to exist within this nothingness for the universe to come into existence. However its possible that there isn't even any nothingness beyond the "edge" of the universe. All the theory states is that there had to be time prior for a singularity expand. Is it possible the singularity always existed and that time has always existed along side it? But to talk about the arising of a singularity you require time first existing. You can't even create time without time.

    • Bob Artor
      Bob Artor 5 أيام قبل

      Why is it irrelevant? The universe is constantly expanding, what's it expanding into, "nothingness"? Does time exist in this "nothingness" too? If so is it the same time that exists in our universe?
      I'm not sure you can apply the normal rules of logic to the inception of the universe and quantum physics.

    • Krumple Themal
      Krumple Themal 5 أيام قبل

      The other way is to go to a point in the distant future. Under the current accepted model the expansion rate will be so great that it will over come the strong force and even atoms will not be able to form because they are being pulled apart faster than they can stay together. So does this mean time will continue on for ever then? The question become, if time began does it just continue on for ever. If you say yes to this then why can't time have always existed to begin with? Most will skirt around this by saying well space and time are inseparable. But its only in the presence of matter that we come to this conclusion that space is linked with time and time linked with space. We can't actually conduct any experiment that proves they are actually linked. And if you try to do this visually it fails too because everything we use to experience it visually involved matter which then skews the result because it is the one having the impact. Also if the expansion rate can continue on indefinitely onto infinity in size then why not it always has done so?

    • Krumple Themal
      Krumple Themal 5 أيام قبل

      @Bob Artor Its irrelevant. The point is, you can't have an "event" happen without time first existing. You can't go from no time to time without time, it's impossible. No action, no change can occur, no entropy. Nothing can occur. And time beginning would be an event. But like I mentioned, humans can hold two ideas as both being true when they contradict each other.

    • Bob Artor
      Bob Artor 5 أيام قبل

      @Krumple Themal
      It's not logic, it's your opinion. There is no reason why time has always had to exist, what was happening during all that time before the big bang?

  • InkMask
    InkMask 5 أيام قبل

    One sleeve is too far up

  • Chris Davis
    Chris Davis 5 أيام قبل

    I disagree. Einstein and Hawking disagree. true, you cannot run general relativity all the way back to time = 0. But because you can't be certain of the state at that point doesn't give you license to make up infinite time before. He calls on eternal inflation, but even Alan Guth who came up with the idea, said it could only be eternal into the future not into the past. In fact, our existence is more likely to be early in that process rather than late. Therefore, eternal inflation may only push the "beginning" back a few more minutes. Secondly, quantum mechanics tends to eliminate the importance of time and space, so near the big bang where quantum effects dominate, you are likely to lose time and space or any organised dimensional system. bringing us full circle, with time "as we know it" originating near the event known as the big bang.

  • Comoroo
    Comoroo 5 أيام قبل +1

    No, time never ‘started’. The Universe has always existed.
    The expansion of a singularity may be calculated by ‘time’, created by mankind, but before that, time & the Universe are one & the same. Never beginning & never ending.

    • Fermion
      Fermion 4 أيام قبل

      I hear people parroting that statement that "time was created by mankind" a lot online. What does that even mean? Relativity theory states that time and space are intertwined, so that statement logically proposes that mankind created space as well.
      Or are you simply speaking philosophically? Because I honestly don't understand your line of thinking.

  • Craigo
    Craigo 5 أيام قبل

    Thank you so much Matt, your channel is the best space/science channel on the internet by a light year. I know it can only be speculation but, If you have time, can you please do a video on the probable orbital pathway of the solar system from its creation closer to the center of the universe to its present 230 million year orbit around the outer reaches of the galaxy. In the early eons of the solar system and the earth what galactic structures and events did we possibly pass by as we surfed our way out on the galactic tide to where we are now?

  • Thomas McBurney
    Thomas McBurney 6 أيام قبل

    God did it!

  • Terry Breedlove
    Terry Breedlove 6 أيام قبل

    Time for everything in this Universe did start at the big bang or otherwise known as Creation.

  • Jason McCredden
    Jason McCredden 6 أيام قبل

    AS THE UNIVERSE GOT SMALLER THE FASTER IT SPUN TO A POINT WHERE IT HAD BECOME SO SMALL THAT THE SPEED IN WHICH IT WAS TURNING IS SO FAST THAT IT FORCED IT TO GIVE WAY ON ITSELF STRETCHING OUT AGAIN

  • S G
    S G 6 أيام قبل

    Oh really? And how they can see or tell that the universe was all tight together? There is no way they can see anything that happened billions and billions yeara ago. They dont even know whats happening in the other galaxy.

  • Watchman Of The End
    Watchman Of The End 7 أيام قبل

    No. The big bang never happened the way "scientists" claim it did. That's why it's just a theory that's disprovable and unprovable. It's a religion. Also, an explosion doesn't create fine order or push galaxies toward one another. Everything would be spread out within the radius of the distance moved from the central point. But don't mind me, my high IQ common sense just doesn't like your religion nor do I like sending my tax money to PBS so they can put this religion on air while I guess unfairly ignoring all the others.

  • Michael Forkert
    Michael Forkert 7 أيام قبل

    Time starts for every living being, when it starts to live, and stops when it dies. No need for a 13 minute video.

    • Stefano Portoghesi
      Stefano Portoghesi 5 أيام قبل +1

      @Edward Schmidt Absolutely right ! Time has no Past , Present or Future , it's one single cyclic dimension that envelopes all single events that have happened already , happen right now , and will happen !

    • Edward Schmidt
      Edward Schmidt 6 أيام قبل +1

      Not sure about that. I'm too sleepy right now to go into it, but in some sense I tend to think that all moments have always existed and always will. Including the brief moment of our lives.

  • Mike Regan
    Mike Regan 7 أيام قبل

    "A certain element?" ✞ lol

  • MaunoMato99
    MaunoMato99 7 أيام قبل

    So if the universe started from nothing, can we expect shit to pop up out of nothing in the future too?

    • MaunoMato99
      MaunoMato99 7 أيام قبل

      @Rinse-esniR Prove it.

    • Rinse-esniR
      Rinse-esniR 7 أيام قبل

      It didn't start from nothing

  • Peter Milanovski
    Peter Milanovski 8 أيام قبل

    Time is actually a human conduct, the universe has no need for time so it does what it wasn't when it wants. Time began when humans began to take note of it. And as for the theory of the big bang starting from a ball of energy! Is incorrect because E=MC2, without mass, you have no energy! So even though Einstein supported the theory of the big bang, his famous equation says that it can't be!

  • Crescent Fresh
    Crescent Fresh 8 أيام قبل

    Yep, the bigbang was the birth of a whitehole, it's true. One day you silly humans will find out that a blackhole is only so deep. Well, metaphorically speaking.

  • Nathanial Ponn
    Nathanial Ponn 8 أيام قبل

    Rocks prefer to be called matter they see the word rock as slang or a slur.

  • Snaggle Toothed
    Snaggle Toothed 8 أيام قبل

    Thanks for clearing that up.

  • Bobby Firouz
    Bobby Firouz 8 أيام قبل

    Why does no one ever discussed time passing slower on Stars due to the higher mass. Time has to move slower on the sun then on earth, so it burns through its fuel slower, making it age slower!

  • busywl69
    busywl69 9 أيام قبل

    big bang lol. just say we don't know.

  • RAVI POHANI
    RAVI POHANI 9 أيام قبل

    Time is just a human construct ....
    The universe is the same as it was earlier, we just keep developing the technology to see further and further...

  • Jay Rich
    Jay Rich 11 أيام قبل

    Time is the acceleration of the big bang

  • Saint Papal Paws
    Saint Papal Paws 11 أيام قبل +1

    My Cat got this but I didn't. :(

  • Big Bad Don
    Big Bad Don 11 أيام قبل +1

    I'm trying to listen and learn.. But those uneven shirt sleeves are bugging the hell out of me.😶

  • Brett_Kendrick
    Brett_Kendrick 11 أيام قبل +1

    No time is a man made concept.

    • Matt W
      Matt W 10 أيام قبل

      How so?

  • Mike J
    Mike J 11 أيام قبل +1

    Time has never existed, it is something we have created to measure things, there is only a perception of time which differs upon reletivity, but how can time dilate due to speed, speed doesn`t exist either, everything in space is still from its own perspective, time needs to be invented to measure matter moving from point a to point b, motion is only relevant to the matter around you and time calculates where that matter will be positioned ant any given point in its motion, thats my theory anyway.