Did Time Start at the Big Bang?


  1. robert harvey

    robert harveyIl y a 9 heures

    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.

  2. David Lucas

    David LucasIl y a jour

    this one video answered many questions.

  3. Stefano Portoghesi

    Stefano PortoghesiIl y a jour

    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" .

  4. Alex Bordon

    Alex BordonIl y a 2 jours

    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?

  5. Alex Bordon

    Alex BordonIl y a 2 jours

    Any tips?

  6. 420drwilldo

    420drwilldoIl y a 2 jours

    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

  7. Daniel Baenziger

    Daniel BaenzigerIl y a 3 jours

    I think Carl would have really enjoyed these videos. Many thanks to Matt and his team for taking part of his mantle. Cheers.

  8. Spiritual Braces

    Spiritual BracesIl y a 3 jours

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

  9. Chris Howe

    Chris HoweIl y a 3 jours

    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???

  10. Elias

    EliasIl y a 3 jours

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

  11. Lelouch Yagami

    Lelouch YagamiIl y a 3 jours

    We can say 1 day before big bang...

  12. Steve Openshaw

    Steve OpenshawIl y a 4 jours

    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.

  13. Dave Anand

    Dave AnandIl y a 4 jours

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

  14. Back to Seattle

    Back to SeattleIl y a 3 jours

    Entropy wouldn't be to happy about it

  15. robert charlton

    robert charltonIl y a 4 jours

    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.

  16. Simon Coles

    Simon ColesIl y a 4 jours

    I'm a bit fan of the Penrose CCC theory

  17. Amzar Nacht

    Amzar NachtIl y a 4 jours

    *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*

  18. chrisgotagun time

    chrisgotagun timeIl y a 4 jours

    God is the big bang theory

  19. Faris

    FarisIl y a 4 jours

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

  20. Prestia2011

    Prestia2011Il y a jour

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

  21. Viker

    VikerIl y a 5 jours

    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

  22. james caley

    james caleyIl y a 5 jours

    Never trust anything with a singularity.

  23. M Johnson

    M JohnsonIl y a 5 jours

    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?

  24. 56pjr

    56pjrIl y a 5 jours

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

  25. Tymen Timmer

    Tymen TimmerIl y a 6 jours

    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?

  26. Games Creator

    Games CreatorIl y a 6 jours

    Thanks for exploding my brain...

  27. Deipatrous

    DeipatrousIl y a 6 jours

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

  28. djchristian82

    djchristian82Il y a 5 jours

    Yea show your mathematical skills.

  29. Traian

    TraianIl y a 6 jours

    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?

  30. Stan TheObserver

    Stan TheObserverIl y a 6 jours

    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.

  31. Stan TheObserver

    Stan TheObserverIl y a 4 jours

    @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.

  32. djchristian82

    djchristian82Il y a 5 jours

    Dark energy is nothing proven just a hypothesis.

  33. Lord Pyrex

    Lord PyrexIl y a 6 jours

    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.

  34. Luigi Cantoviani

    Luigi CantovianiIl y a 6 jours

    Inflation is not a matter fact event.

  35. Roboprogs

    RoboprogsIl y a 5 jours

    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?!?”

  36. Theo0x89

    Theo0x89Il y a 7 jours

    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.

  37. neil u

    neil uIl y a 7 jours

    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

  38. Enki Son Of Anu

    Enki Son Of AnuIl y a 7 jours

    Not weird enough

  39. Hecka Nice

    Hecka NiceIl y a 7 jours

    No. Time starts with a point of consciousness

  40. Ive_y 79

    Ive_y 79Il y a 8 jours

    I watche this then I died

  41. Apollo Stone

    Apollo StoneIl y a 8 jours

    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.

  42. Jari Haukilahti

    Jari HaukilahtiIl y a 9 jours

    Maybe time started big bang.

  43. memo redspectrum

    memo redspectrumIl y a 9 jours

    planc length has some idea

  44. Akshay Kalghatgi

    Akshay KalghatgiIl y a 9 jours

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

  45. Vincent Smith

    Vincent SmithIl y a 7 jours

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

  46. Dominic A

    Dominic AIl y a 10 jours

    It’s magic !,no other explanation.

  47. ZERO3690

    ZERO3690Il y a 10 jours

    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

  48. quidam

    quidamIl y a 10 jours

    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 !!!

  49. Andrew Pope

    Andrew PopeIl y a 10 jours

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

  50. Underscore Pete

    Underscore PeteIl y a 11 jours

    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?

  51. Ajit Jha

    Ajit JhaIl y a 11 jours

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

  52. PistolPunch

    PistolPunchIl y a 11 jours

    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.

  53. Martin L

    Martin LIl y a 11 jours

    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!

  54. Systematic Error

    Systematic ErrorIl y a 11 jours

    ALLAH is the GREATEST. frreporter.com/v/vid%C3%A9o-PyCezBD-5EQ.html

  55. Deborah Mahon

    Deborah MahonIl y a 11 jours

    Our God is an awesome God.

  56. The Werewolf

    The WerewolfIl y a 11 jours

    Sure. but what about Galactus?

  57. Kyle Buchanan

    Kyle BuchananIl y a 11 jours

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

  58. penguins forall

    penguins forallIl y a 11 jours

    Big bANG rewind 0000

  59. WolfgangLMclain

    WolfgangLMclainIl y a 12 jours

    Something just occured to me, the weight of the universe at its earliest point must have been ENORMOUS, what did that mean for the spacetime curve of the universe?

  60. LouSaydus

    LouSaydusIl y a 11 jours

    You should ask your mother, her rear is of similar density/mass.

  61. WolfgangLMclain

    WolfgangLMclainIl y a 12 jours

    *notices* *reaches into video to tug your shirt into place*

  62. Kirk-Da Rooster Gordon

    Kirk-Da Rooster GordonIl y a 12 jours

    Science tells us you can't create something from nothing okay so what created the singularity that started the big bang?

  63. Romel Abou-Akl

    Romel Abou-AklIl y a 12 jours

    Our laws of science break down at a certain time interval after the big bang, commonly associated with the plank length. I do not have an answer for you, and nobody can answer it because nobody has a good answer to that. Some people have formulated mathematical explanations of how it could have came from "nothing", but there definition of "nothing" can be considered to actual contain something. Also if time does not exist before the Big Bang occurred it actually does not make much sense to ask what happened before it, or what created it since that is a human wording of events that are in a sense timeless. It is hard for us to think of something as timeless. Of course if it stems from another multiverse/bubble universe, etc you can still trace it back to the initial moment in that time frame. Some propose a creator, as there are some logical arguments such as the Leibniz's cosmological argument and many others that attempt to show why there must be one. This is a field of fascinating advancements, logic, physics, mathematics and in some senses even spirituality as we seek where the atoms that make up our consciousness and everything around us stem from. Good luck on your journey for knowledge.

  64. Ulfat Dawood

    Ulfat DawoodIl y a 12 jours

    Doesn't the Big Bang Theory violate the "Law of Conservation of Mass" ??

  65. Theo0x89

    Theo0x89Il y a 7 jours

    Conservation of mass hasn't been at thing since Einstein discovered that mass is a form of energy. What you mean is conservation of energy, for which you would need a general definition of energy, which doesn't seem to exist in general relativity. But that's beside the point of your question, I guess, because you seem to think that the energy content of the universe somehow changed at the Big Bang. The Big Bang Theory doesn't say anything like that. It only says that the energy density used to be very high at some point in the past from which the universe went on to expand.

  66. Brian Cananzey

    Brian CananzeyIl y a 12 jours

    what if the universe does have a cyclical big bounce and each time it bounces it grows bigger than the last bounce. eventually if exceeds its ability to crunch any longer and after its last bounce it expands forever. We are in that expansion? Hmmm? Like a ball bouncing every time going higher and higher till it leaves the surface of the earth? ....excuse my while I hit this joint again!

  67. Harry H

    Harry HIl y a 13 jours

    Alien in another universe made our universe, their universe was in turn made the same way, ad inf, different universe different laws

  68. A Tothetop

    A TothetopIl y a 13 jours

    Every Christian who appeals to the Big Bang theory from a causality perspective needs to see this!

  69. Subodh Khandekar

    Subodh KhandekarIl y a 13 jours

    At 5:22 ... It's not 3 dimensional... It's 4 dimensional space !!!

  70. Lucid D

    Lucid DIl y a 13 jours

    The big bang is like the mitochondrial eve in genetic, just a logical response from a bad question or attitude. Same with the chicken or the egg? question. They are just bias rooted in our social understanding and psychology. There is no mitochondrial eve that ever existed and both the egg and the chicken are phases in evolution, both cell forms and bodies evolved together to produce one or the other.

  71. tenaciousvalor

    tenaciousvalorIl y a 13 jours


  72. Timothy Bucci

    Timothy BucciIl y a 13 jours

    Patterns in the universe repeat themselves. The universe probably will too. If all of matter had a specific origin, and the amount of mass in the universe has a limit, even if myriad... eventually acceleration will shift back to deceleration and combine back into a single singularity black hole once again. Maybe after .54 googol years, is my guess

  73. Timothy Bucci

    Timothy BucciIl y a 11 jours

    @Adrian Constantin But they have only been observing this ancient universe for what, 100 years? With pristine telescopes and such? They may be misperceiving things.

  74. Timothy Bucci

    Timothy BucciIl y a 11 jours

    @Adrian Constantin Or acceleration is bullshit. The Millennium Simulation shows what has been theoretically observed, and there are flows or currents of galaxies headed toward specific gravitational wells.

  75. Adrian Constantin

    Adrian ConstantinIl y a 11 jours

    One way this doesnt work is if acceleration / inflation never stops ... than gravity does not win

  76. Dima Chotin

    Dima ChotinIl y a 14 jours

    Did he just say Steinhardt-Turok model? Like in... a hard as stone dinosaur hunting american native?

  77. Sarath Ambalapatt

    Sarath AmbalapattIl y a 14 jours

    Imo Past and future exists because we have memories and thoughts There is only just PRESENT and its always CHANGING!

  78. David Heizer

    David HeizerIl y a 10 jours

    This is why I think it's silly wondering why we can't see all of the 11 dimensions predicted by string theory: we already know we live in at least a 4-dimensional universe, but only three of those dimensions are physical. We really cannot directly perceive the time dimension; we experience it only through the contrast between what exists at the moment and what our memories tell us used to exist.

  79. P Sigh Ko

    P Sigh KoIl y a 14 jours

    It seems most scientists reject this presentist view (and favor the eternalist block universe). You're a minority, my friend.

  80. jojolafrite90

    jojolafrite90Il y a 14 jours

    I"ts tricky to talk about, to talk about the size of an infinite universe. That was a shitty rime.

  81. froop

    froopIl y a 14 jours

    the real question is: is time a conserved property?

  82. MoscowBaseStation

    MoscowBaseStationIl y a 14 jours

    Please help me. I feel in order for the big bang to happen there must be a space within the big bang to take place ..

  83. Aarond Anton

    Aarond AntonIl y a 15 jours

    The science of the Big Bang as told by science is flawed in that the heat and forces involved would kill off any living organism effectively sterilizing everything in the Universe. Good news is that God created everything from a single point of origin and in that moment time started God the Father and Creator in Heaven is infinite and eternal.

  84. Aarond Anton

    Aarond AntonIl y a 14 jours

    @P Sigh Ko yup trolling for fishers of men

  85. P Sigh Ko

    P Sigh KoIl y a 14 jours

    Lol. xD Troll.

  86. JT

    JTIl y a 15 jours

    Finally someone who actually knows what they're talking about

  87. Kyle Buchanan

    Kyle BuchananIl y a 11 jours

    hes not got a clue r u mad

  88. SaStrixS

    SaStrixSIl y a 15 jours

    An even better question would be "What time did the big bang start?"

  89. Rosolino Lo Sciuto

    Rosolino Lo SciutoIl y a 15 jours

    Il N.W.O. ha un programma specifico e' determinato con l'Unione delle Nazioni Repubblicane impartito dalla coscienza universale

  90. Osvaldo Lopez

    Osvaldo LopezIl y a 16 jours

    For those using cc, at 10:50 it says "brains" but it should say "branes"

  91. Forbes Media

    Forbes MediaIl y a 16 jours

    this guy needs a stylist or someone to tell him to wear his shirt properly -_- it is distracting

  92. Thomas Gassett

    Thomas GassettIl y a 16 jours

    When you wind the clocks back to just before the big bang you don't end up with a singularity ... you end up with nothing. Before the universe there was ... nothing.

  93. P Sigh Ko

    P Sigh KoIl y a 14 jours

    @Tom Coates Um. It seems to me you don't understand cosmology. If you don't understand something, then shut up and don't prentend you have debunked it. It is embarassing.

  94. Tom Coates

    Tom CoatesIl y a 16 jours

    Good one TG. Space and time could not have begun at the BB because there was nowhere for the universe to come into and no point at which it could start. So no BB. Solid matter and energy does exist. The question still stands. Where did it all come from? If I was offered a complete hot meal. Then I was told there was no chef, and that the meal just happened by itself, I would think that someone might be a touch mad. A creation demands a ..................

  95. Delfino Garza

    Delfino GarzaIl y a 16 jours

    Time started at the big bang if the big bang started counting time then. This channel is full of magic, it's not scientific. This guy is a wizard...ignore him or he will drag you into a quest where you will risk your life and gain something trivial.

  96. exitolaboral

    exitolaboralIl y a 16 jours

    I don't understand why there is an "universal time" for the whole universe and a timeline for the universe is presented, when GR implies that "there is no universal clock". The discussion seems pointless, is there an "universal time" or there is not?

  97. P Sigh Ko

    P Sigh KoIl y a 14 jours

    ​@Lünkel GR and inflationary theories predict it. However, if you take QM into account, it seems there is no geodesics incompleteness. At least on the Cosmology from quantum potential it does not. Furthermore it doesn't apply to the comoving geodesics themselves.

  98. exitolaboral

    exitolaboralIl y a 15 jours

    @Lünkel thanks!

  99. Lünkel

    LünkelIl y a 16 jours

    Didn't he explicitly say that there isn't one single universal time, but that each observer has his own worldline that has to be tracked. It's just that GR predicts that all worldlines converge on a single point and time.

  100. Rob de Vrind

    Rob de VrindIl y a 17 jours

    If you move with the speed of light time stands still. Alan Guth inflation talks about expantion in speeds faster than the speed of light. Didn't that rewind time??

  101. Alex Taunton

    Alex TauntonIl y a 15 jours

    No. Time appears to stand still from an inertial observer, not for you.

  102. Aidan Sheridan

    Aidan SheridanIl y a 17 jours

    Have you considered loop theory?

  103. Tom Coates

    Tom CoatesIl y a 17 jours

    Yet another theory. Next! Space/time is a nothing. Its a fantasy. One can't mix differing items as one. Its like ...three metres of orange flavoured sympathy. ....'can't see the wood for the trees?' No its ......'don't want to see the wood or the trees'. Drivel.

  104. directtalk1

    directtalk1Il y a 17 jours

    I can’t understand the arm lengths on his t shirt

  105. Wu Li

    Wu LiIl y a 17 jours

    Classical physics are so mired in metaphysical mystical mumbo jumbo. Set your mind free people, in a multiverse within a singularity the only thing it remains humanly possible to appreciate is what's missing from this picture. Examining our own mortal fallibility should reveal the supersymmetry of the Standard Theory, while Roger Penrose's theory of quantum induced microwave vibrations in the brain has already received two experimental confirmations. Whether physicists like it or not, Quantum Cognition is a recognized field and we are going down the rabbit hole or toilet of your personal preference. Assuming 42 is as good an answer as anyone is ever going to get, that should make sparkling laughter, the infectious kind known as Santa Claus laughter, should express the lowest possible energy state of the conscious mind, and prove to be magically more than 100% efficient and conveying energy and information.

  106. Wu Li

    Wu LiIl y a 14 jours

    The next scientific revolution is beginning and nobody has a clue what its all leading up to, and condensed matter physics and AI research all appear to be converging with neurology and require four times more complex mathematics than we have, which the computers are about to spit out.

  107. Wu Li

    Wu LiIl y a 14 jours

    Penrose's theory is garbage, but he got together with a neurologist and they figured out where quantum mechanics might manifest in the brain. Quanta appear to be whatever you want them to be, often being called "formless" and recent experiments even establishing that time can appear to flow backwards on macroscopic scales, using a micron sized polystyrene bead suspended above a heat bath. We are rapidly going down the rabbit hole, whether you wish to admit it or not, and a DARPA scientist just patented the first room temperature superconductor.

  108. Wu Li

    Wu LiIl y a 14 jours

    A reminder, it is still illegal to vote for Mickey Mouse in Maryland, so stop it already. Donald Duck won. Democracy is fulfilling your patriotic duty and voting for whichever clown advertises the most and is not a member of the Mickey Mouse Club.

  109. Wu Li

    Wu LiIl y a 14 jours

    You have to consider your source carefully, when dealing with idiots paid to spout 2,000 year old bullshit.

  110. Wu Li

    Wu LiIl y a 14 jours

    Academics are all part of the military-industrial complex and, these days, complain about paywalls, while lobbying congress to censor the entire internet, because one in five of the idiots they teach insists the sun revolves around the earth. Forty years of research concluded the republican party organizes like chickens, providing proof that military intelligence and Wall Street ethics are bullshit.