Did Time Start at the Big Bang?

  • تم نشره في 2019/07/18
  • Thanks to LastPass for sponsoring PBS DS. You can check out LastPass by going to lastpass.onelink.me/HzaM/2019Q3JulyPBSspace
    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 • 4 437

  • Anthony Clegg
    Anthony Clegg ساعات قبل

    Time was made up by humans. It's abstract.

  • Michael Bourquin
    Michael Bourquin 12 ساعات قبل

    That was 'realistically' trippy. PBS I love you and always will.

  • Logan Stroganoff
    Logan Stroganoff 17 ساعات قبل

    I didn't kno Robert the bruce was an astrophysicist

  • Darth Twerk
    Darth Twerk 19 ساعات قبل

    Can you have the neck hole on your shirt centered around your neck in the next video?

  • Flux Capacitor
    Flux Capacitor أيام قبل

    The Universe has always existed

  • Jennings Cunningham
    Jennings Cunningham أيام قبل

    Really enjoy your videos. I hope someday to understand them

  • Jonathan Capps
    Jonathan Capps أيام قبل

    I was focused on his left sleeve the entire episode.

    NASOOOBEE أيام قبل

    what is wrong with your shoulders mate? and your videos are really terrible. each next video contradicts the previous one. Good job with the female hair aswell.

  • مدح غير الله شرك

    And the expansion of the universe mentioned in the holy qur'an :
    With power did We construct the heaven. Verily, We are Able to extend the vastness of space thereof
    Adh-Dhariyat : 47

    • Anand Patel
      Anand Patel 5 ساعات قبل

      ohh really
      Can you also share mathematical proof of that we need it.

  • fahkrazyshaggy
    fahkrazyshaggy أيام قبل

    I have so many questions about the big bang. Like how does the great attracters play in to this

  • teleman07
    teleman07 2 أيام قبل

    Everything makes sense until you ask the question "why".
    Surely there should have been no big bang and nothing should exist at all. Why the universe exist with all this arbitrary mathematical constants and connections. Even if there are infinite number of universes where shiit like white holes exist and time goes backwards for chemical reactions and whatnot. Why TF is this the case?

  • Jackaloopt
    Jackaloopt 2 أيام قبل +1

    I believe that our singularity/Big Bang is just the output of a black hole.

    • Open Wide
      Open Wide 2 أيام قبل

      That's what I'm thinking too...

  • David DeLaney
    David DeLaney 2 أيام قبل

    The other thing encountering a singularity in your theory's math can indicate is that near there, you're using the wrong type of coordinates. (Examples: the singularity in the ordinary metric at the surface of a black hole; the singularities in Feynman diagrams from self-interaction loops, which 'renormalization' can solve.) This is even visually easy to see ... by looking at that same North Pole with longitude lines converging on it. Locally, the North Pole doesn't look any different from anywhere else on the sphere (just colder) - it's trying to measure things near it with a 'grid' made of lines converging from every direction that messes things up.
    --Dave, will mathsplain for food

  • Sharath S Pawar
    Sharath S Pawar 2 أيام قبل

    Towards the end i thought youtube encountered a glitch in the suggestion where it started playing next video with Dope trance track even before previous video end :-D

  • Joker3000
    Joker3000 2 أيام قبل

    7:04 my mind was blown by the position of the north pole!
    Thank u for showing! ;)

  • Bobby You Tube
    Bobby You Tube 2 أيام قبل

    I don't give a rats ass what you call it or how you explain it. You'll NEVER be able to explain WHY.

  • Petteri Tuovinem
    Petteri Tuovinem 3 أيام قبل

    is it even meaningful to speak of an expansion in an infinite universe

  • Carl Wheeler
    Carl Wheeler 3 أيام قبل

    Too many theories. I feel like these physicists are proposing these theories just to grab some attention. So.. I have come up with a theory; "The Universe is just the atomic structure of a huge cosmic dog turd."

  • Jeff Allen
    Jeff Allen 3 أيام قبل

    I find it amazing how twisted these egg heads get when trying to explain this stuff. They totally ignore that God Himself was the one who created this all.

    • Jeff Allen
      Jeff Allen 2 أيام قبل

      @Pat Hill LMAO! I love triggering you Atheist... it's so damn easy.

    • Pat Hill
      Pat Hill 3 أيام قبل

      Jeff Allen keep telling yourself that champ

  • Justin Kuemmerle
    Justin Kuemmerle 3 أيام قبل

    I want Twister Theory.

  • Jamie Lancaster
    Jamie Lancaster 3 أيام قبل

    Sounds like a whole lot of people were dropping LSD to come up with some these theories

  • Chunchunmaru
    Chunchunmaru 3 أيام قبل

    Isnt anything north of the north pole south?

  • Fernando Sanchez
    Fernando Sanchez 3 أيام قبل

    9:34 that kinda reminds me to the Riemann Z function which is another I don't understand but that have seen long ass videos about

    • Stefan S
      Stefan S 3 أيام قبل

      Funny how science can be "beautifull" so much so we watch it without understanding most of it.

  • rpbsjy
    rpbsjy 3 أيام قبل +1

    That NASA animation at 0:55 has the Big Bang spitting out fully formed galaxies, yet Matt included it in the video. No wonder we are confused...

  • The Jim Reaper™
    The Jim Reaper™ 4 أيام قبل +8

    I still can't get my head around the fact that the Universe is only 3 times older than the Earth... And that 13.8 billion years is nothing in the eons that the universe will carry on for were basically still in universe infancy!!!

  • Aural Essex
    Aural Essex 4 أيام قبل


  • robert harvey
    robert harvey 5 أيام قبل

    Those that say there cannot be time before the singularity do not conceive how a black hole is created. If a black hole is a singularity, then we know there was time before the singularity as in the collapse of a star to create the black hole and a singularity. To try to say there was no time before the Big Bang is a misnomer.

  • David Lucas
    David Lucas 6 أيام قبل

    this one video answered many questions.

    • David Lucas
      David Lucas 3 أيام قبل

      ​@Ryan Rauber i get it. in real life your a flake. a few drinks and mr 1 inch man becomes a keyboard warrior.

    • Ryan Rauber
      Ryan Rauber 3 أيام قبل

      Also, I'm drunk sooo........

    • Ryan Rauber
      Ryan Rauber 3 أيام قبل

      You're mom answered many questions last night when she was s'n my D. Boom!!!!!!!!

  • Stefano Portoghesi
    Stefano Portoghesi 6 أيام قبل

    How do we know that the Universe began 13.8 billions years ago ? Surely that measurement of earthly "Time" may be valid for our human sphere of reality only but what about universal "Time" , one individual's past event in "time" may be another individual' future event in "time" .

  • Alex Bordon
    Alex Bordon 7 أيام قبل

    I have a new gravity, time and consciousness theory that connects quantum mechanics, black holes, dark energy and gravity with existence and a universal balance, what should I do?

  • 420drwilldo
    420drwilldo 7 أيام قبل

    If your really think about it what is time but the observation of the Decay rate of the universe so of theyer is nothing to decay then there is nothing to observe decaying

  • Daniel Baenziger
    Daniel Baenziger 8 أيام قبل +2

    I think Carl would have really enjoyed these videos.

    Many thanks to Matt and his team for taking part of his mantle. Cheers.

  • Spiritual Braces
    Spiritual Braces 8 أيام قبل

    i always wondered if our universe was just some black hole in another universe...

  • Chris Howe
    Chris Howe 8 أيام قبل

    Was there a video that tackled the idea of Tachyons during expansion?
    My best guess. No.
    The density of the universe at the Singularity would create a difference in 'c' similar to what we see around a black hole. However, relativity brings us to a screeching halt there since it's from our perspective that 'c' is changing at all.
    Would this all come together to indicate that a sationary observer during expansion would in-fact have witnessed tachyon-level information transmission? Wouldn't this also mean that 'c' is relative to the observer and thus tachyons would be possible only from a certain perspective?
    Example: 2 starships travel conventionally at 0.75c towards eachother. The observer on starship a would witness starship b approaching at >c. viola! Tachyons??? This would also mean a new c is in order where 2c is "true" constant???

  • Elias
    Elias 8 أيام قبل

    watching this sort of stuff feels a bit like getting my brain spanked

  • Lelouch Yagami
    Lelouch Yagami 8 أيام قبل

    We can say 1 day before big bang...

  • Steve Openshaw
    Steve Openshaw 8 أيام قبل +3

    I am an atheist, but listening to how convoluted all these different creation theories are, it makes me think that it may well just be simpler to buy that some old dude with a beard did it.

  • Dave Anand
    Dave Anand 8 أيام قبل

    We only speak of one directional time in the positive direction - What about NEGATIVE Time Axis ???

  • robert charlton
    robert charlton 9 أيام قبل

    time and space are very complicated, take for example, that we can travel at the speed of light and there are twins, that are astronaughts, 1 of them stays on earth and the other goes on a trip to jupiter at the speed of light, when he comes back, the twin that stayed on earth would be older than the twin that went to jupiter.

  • Simon Coles
    Simon Coles 9 أيام قبل

    I'm a bit fan of the Penrose CCC theory

  • Amzar Nacht
    Amzar Nacht 9 أيام قبل

    *heh* Time pre-dated the 'big bang' - but there was no way to measure it as the required atomic vibrations were at a standstill. Nothing got within a thousand light years without being sucked in...
    Once the trigger initiated, time could then be measured by the vibration of energetic particles that formed soon after.
    Time as *WE* know it - you know, these bone-encased gray blobs of neurons that have existed for about one billionth of a second on the 'year clock' of the life of the universe (as in, one billionth of a second from midnight, december 31st on that calendar) - is something only *WE* conceived and chose to call 'time', so what time was prior to the creation of our small corner of the greater macroverse well... it had already been defined by others. Perhaps others advanced enough to even manipulate or travel along it *then*

  • chrisgotagun time
    chrisgotagun time 9 أيام قبل

    God is the big bang theory

  • Faris
    Faris 9 أيام قبل +1

    Is anyone else triggered about the way he wears his shirt?

    • Prestia2011
      Prestia2011 6 أيام قبل

      Why cause it's lower on one shoulder? Maybe he's got uneven upper body

  • Viker
    Viker 9 أيام قبل

    Im watching this video trying to expand my knowledge and get smarter and cause i like space but god why am i so stupid that i dont understand almost a single thing

  • james caley
    james caley 10 أيام قبل

    Never trust anything with a singularity.

  • M Johnson
    M Johnson 10 أيام قبل

    It seems like the Universe once expanded to a point of thermal equilibrium is the same as the universe before the big band at thermal equilibrium. What about a Bose-Einstein condensate could it be state of matter at the point before the big bang at the end of that expansion?

  • 56pjr
    56pjr 10 أيام قبل

    "In the beginning, God created the Heavens and the Earth" (Genesis 1:1).

  • Tymen Timmer
    Tymen Timmer 11 أيام قبل

    One thing that bothers me is the whole t=0 or t=something for that matter. How do you know what time we live in? And what happens from t=-1?

  • Games Creator
    Games Creator 11 أيام قبل

    Thanks for exploding my brain...

  • Deipatrous
    Deipatrous 11 أيام قبل

    Your maths is shaky. Which is a pity because this channel is better than most.

    • djchristian82
      djchristian82 10 أيام قبل

      Yea show your mathematical skills.

  • Traian
    Traian 11 أيام قبل

    So, with a Planck time as the smallest unit of time and a Planck length as the smallest unit of distance, why is it mathematically such a problem? instead of infinitely divisible 0.something why not make 1 the smallest number possible (1 as in the singularity) and abolish fractions. (one is the smallest number, the next smallest is 2 ...) shouldn't the math solve itself after that? you get as far as you can get as long as you have space time, and before that it doesn't matter because without space time you can't define it. In fact if you want to go back the universe's beginning 2 is the farthest you can go because that's the actual first second and the first measurable size between 2 points (you need 2 at least points to measure a distance or an interval of time. P.S. -for you physicists out there: how is gravity warping space-time ? is the Planck unit of distance changing or what?

  • Stan TheObserver
    Stan TheObserver 11 أيام قبل

    If the Universe was all at one point...then how could it be infinite? Also,dark energy was not all it was at the big bang as it grows as it still perculates out of nothing. Something's missing.

    • Stan TheObserver
      Stan TheObserver 9 أيام قبل

      @djchristian82 They are certain that by any other name a force is expanding the universe. It's everything after that they can't say for certain.
      Dark Matter on the other hand might just be regular matter,just in microscopic bits and invisible clouds of it. Or not.

    • djchristian82
      djchristian82 10 أيام قبل

      Dark energy is nothing proven just a hypothesis.

  • Lord Pyrex
    Lord Pyrex 11 أيام قبل

    Black holes consume all matter over time and eventually each other and eventually only one exists and eventually even that is taken back to a single point which then erupts back out into a new big bang.

  • Luigi Cantoviani
    Luigi Cantoviani 11 أيام قبل +1

    Inflation is not a matter fact event.

    • Roboprogs
      Roboprogs 10 أيام قبل

      Yeah inflation theory makes me cringe, too. Any observations of an inflation, or a falsifiable test?
      My theory is that the universe started are as something about the size of a lumpy beach ball 🤡
      (But I don’t know how to test it, so it’s probably crap even more so)
      As Opus the Penguin said “Well, why not?!?”

  • Theo0x89
    Theo0x89 12 أيام قبل

    6:34 _"we trace a path called a geodesic, which in general relativity is the shortest path between two space-time coordinates"_ More like the "straightest" path between two points in space-time. Typically it is the longest path, measured in proper time, which is the measure of length in space time. Also, "between two space-time coordinates" is an awkward formulation. There is no need to refer to coordinates, and the two endpoints of the path would correspond to two sets of four coordinates with respect to some coordinate system.

  • neil u
    neil u 12 أيام قبل

    ok, but what size would a black hole be thats the mass of the universe? how could the big bang have started smaller than that? does information theory put a minimum size for the whole universes information to be stored on the surface a universe mass black hole? thanks

  • Enki Son Of Anu
    Enki Son Of Anu 12 أيام قبل

    Not weird enough

  • Hecka Nice
    Hecka Nice 12 أيام قبل

    No. Time starts with a point of consciousness

  • Ive_y 79
    Ive_y 79 13 أيام قبل

    I watche this then I died

  • Apollo Stone
    Apollo Stone 13 أيام قبل

    No one really knows how the universe started but mainly theories are the only thing to talk about. Again, we know nothing, yet we always explore somwthing.

  • Jari Haukilahti
    Jari Haukilahti 13 أيام قبل

    Maybe time started big bang.

  • memo redspectrum
    memo redspectrum 14 أيام قبل +1

    planc length has some idea

  • Akshay Kalghatgi
    Akshay Kalghatgi 14 أيام قبل

    Has anyone ever considered the possibility that the Big Bang might have been a White Hole.

    • Vincent Smith
      Vincent Smith 12 أيام قبل +1

      He kind of said that that was a possibility in different words

  • Dominic A
    Dominic A 15 أيام قبل

    It’s magic !,no other explanation.

  • ZERO3690
    ZERO3690 15 أيام قبل

    I see.. Big Bang is not a theory any more, it is a fact and so we are now focused on other things to solve

  • quidam
    quidam 15 أيام قبل +1

    Hey, great thanks from France !!! I was wondering if you'd talk about the BGV theorem some day as it seems to have a connection with beginnings ? I've heard about it but can't grasp the implications and on what assumptions it rests... Anyways, big big fan of yours !!!

  • Andrew Pope
    Andrew Pope 15 أيام قبل

    I greatly appreciate this honest attempt at explaining this stuff however I am absolutely none-the-wiser

  • Underscore Pete
    Underscore Pete 15 أيام قبل

    Is it possible that 3 of our universal forces already existed at the proposed time of the big bang and gravity then occurred for the first time in our universe? Can a universe exist without gravity?

  • Ajit Jha
    Ajit Jha 16 أيام قبل

    I am inclined towards Holographic Universe. The space itself is a projection, where as the so called reality is somewhere else.

  • PistolPunch
    PistolPunch 16 أيام قبل

    What if black holes singularity after vapourizing somehow creates an explosion which causes space to expand and creates new materials. Like dividing by 0. It would create and endlesss cycle of new universes everywhere.

  • Martin L
    Martin L 16 أيام قبل +1

    Odd place to put this. I'm an evolutionary biologist, so am prone to be a Smolin fan boy. But this is something different, that all PBS channels have in common. I'm British and am totally sick to the teeth by the very American obsession with religion vs science. You don't really get it in the UK. To be honest, I am just SO cheesed off that everytime I look at something interesting, videos, below the video I'm watching, nearly always carry at least some videos by people who are either crazy, or have no idea what a theory means, and why science must always be agnostic, about everything. Sorry to have a rant. I'm just fed up with this unending war between OCD anti religion, and plain stupid anti science. Drives me nuts. So hooray for PBS, Crash Course etc. I am seriously in love with PBS. If you carry on, you might even get as good as the BBC. HA!

  • Systematic Error
    Systematic Error 16 أيام قبل +1

    ALLAH is the GREATEST.

  • Deborah Mahon
    Deborah Mahon 16 أيام قبل

    Our God is an awesome God.

  • The Werewolf
    The Werewolf 16 أيام قبل

    Sure. but what about Galactus?

  • Kyle Buchanan
    Kyle Buchanan 16 أيام قبل

    you have explained exactly nothing, cmon start making some meaningful videos please guys