Did Time Start at the Big Bang?
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- เผยแพร่เมื่อ 17 ก.ค. 2019
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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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Hosted by Matt O'Dowd
Written by Matt O'Dowd
Graphics by Leonardo Scholzer
Directed by Andrew Kornhaber
Produced By: Kornhaber Brown
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سلطان الخليفي
Q: Did time start at the big bang?
A: Depends on what you mean by "time". And "start", "at", "big bang", and "did" for that matter.
Alex Taunton Can’t forget “the”
Sounds like a lawyer
Sounds like Jordan Peterson
@@sukritmanikandan3184 I was about to comment about Jordan Peterson 😂
no but in the singularity all time is the same time
Gotta love the message of "If it makes sense, you're probably on the wrong track."
That basically means:" *YOU ARE NEVER RIGHT!* "
Truth is stranger than fiction.
This is excellent advice. Im getting behind on rent so Ill just quit my job.
Haha 😂🤣 ye so true
Should have been "if your theory complies with what you intuitively think, you're probably wrong"
A long time ago, actually never, and also now, nothing is nowhere. When? Never. Makes sense, right? Like I said, it didn't happen. Nothing was never anywhere. That's why it's been everywhere. It's been so everywhere, you don't need a where. You don't even need a when. That's how "every" it gets.
...
Forget this. I wanna be something. Go somewhere. Do something. I want things to change. I want to invent time and space, and I know it's possible because everything is here, and it probably already happened. I just don't know when to start, and that's exactly where it started.
Good quote from HotEWIG
what's the flag in your pfp?
God scratching his head
@@masicbemester neurodivergent pride flag. I'm autistic.
"What happen before big bang"
Suddenly I remember the white space squidward visit with the time machine
xD
Nothing happened. Ah, so then something happened? What? Nothing is something. Oh no, not this guy again.
"A hundred years ago we discovered the beginning of the universe." 100 years. That sentence alone makes me think about how young is our modern understanding. We discovered a lot, but we still know next to nothing.
@fynes leigh ????????
@fynes leigh lmfao
@fynes leigh Try relaxing.
@fynes leigh by the "we" he meant us - humans, funny how some people don't understand even the most common sentences
@@jeremywright9511 you don't have to talk to him, he is more salty than salt itself 😂😂 it's just not worth the struggle, he's just like upgraded Karen that has problem even with his existsence
I love this channel's ability to go beyond the basics of most Space/Time theories and hypotheses while not oversimplifying things, yet still being articulate and artistic enough to not leave a mere enthusiast like me totally lost. Probably the best channel on TH-cam.
Yes‼️
Yea, exactly! I was kind of surprised that I got though the whole video without my brain hurting.
I assure you, subjectively though, this is the best channel on TH-cam!
I completely agree.
right, and as a none native English speaker i can learn the language along the way
I´ve been learning about the universe for years and years - my mind still blows up, thinking about time and infinity.
think about multiple infinities or infinite infinities ... that'll keep you going for a while.
Have you considered God , X
"Our Heat Death is someone else's Big Bang."
does he say that?
@@Hyporama 11:09
Lol, 1 of only 2 things he said the whole video that wasn't rought with contradiction, paradox, or complete nonsense! Feynman was right, physicists can't just say "we don't know but we're open to ideas"
Gives you a sense of purpose, should you ever find yourself unable to tip the waiter at the Reastaurant at the end of the Universe....
@@dead4moneyi dont think ya know what ya talkin about
Did time start at the big bang?
Science: Well maybe but actually maybe
thank you for not posting a self-deprecating comment that ends up having a million of likes.
thank you for actually mentally engaging with the content as presented, the other commenters are killing my enthusiasm for this race faster and more exponentially than any goddamn expansion of the universe.
@Snaggle Toothed How can 'space begin'?
How could there be a 'space that's not relative to another space'?
Also where did it exist?
@@milanstevic8424 Bet it feels nice to be super smart.
Tell me more!
@@lancetschirhart7676 No, you try and impress me. I'm just a humble victim immersed in a sea of unremarkable if loud opinions, and I'm ought to get angry sometimes. I see you got angry for quite the opposite reasons, therefore I insist that you steal my spotlight and enlighten me.
@@milanstevic8424 K, I'll try my best. After doing a deep dive into human memory, I developed some new mnemonic techniques which I used to set a couple world records. Then I taught them to someone who emailed me about it, and he went on the win the world memory championship three times. I also applied them to become the US memory champion, which I am. Whatever else I have to impress you is not verifiable from your end, so I'll leave it out.
so you're telling me 14 billions years ago, me and my crush were basically together?
not possible.
I think that's the most solid evidence against it yet.
cool that was pretty hot indeed!
🤣🤣🤣
Absolutely. You were total into each other.
@Doom Reverb CHILL BRO LET THE BOY BE HAPPY FOR ONCE💀💀
On this subject, it seems like our imagination is far more productive and fertile than our knowledge.
“Einsteinian” if only he were alive today to describe his work with his own adjective.😂
"When will then be now?"
"Soon."
-Space Balls
Classic Mr. Video!
Lol
I prefer this one:
"Where are we going?!"
"Planet 10!"
"When will we get there?!"
"Real soon!"
Is it possible for something to exist outside of time? Wouldn't that thing, by definition, be "eternal"?
@@johnmalsantri1026 God is supposed to be eternal
I missed 3 seconds of what he said and i was lost the whole video.
Darn it, I lost 3 seconds reading your comment and now I'm lost.
@@kaifuddin1807 its ok i got lost after 3 seconds of reading other comments too
Look it always happens with me xD
(1) missed call from Harvard university
Sorry if I got anything wrong
Tuyen Mey Everytime i try to press ‘read more’ it thinks im trying to reply to your comment. Unless... Did you write ‘read more’?
I think it's pretty cool that just by being at the singularity of a black hole the universe ends.
In a sense. We use those words but that doesn't mean it matches common parlance
How do you know this?
@@hopsterbb2571clearly they’re commenting from inside a black hole
Racist!
I just love thinking about these topics. I've been watching for a long time, but wanted to say how much I appreciate you and this channel.
I was focused on his left sleeve the entire episode.
Ditto!
God damn you
thanks now i can't unsee it
Yeah can’t unsee that now thanks ffs
thats right thoe nigga
All I know is it’s a blessing beyond compare to have lived on this magnificent planet for 84 years ... “what a ride”
Well said Bill!
Great sentiment!
Now that is gratitude that lots don’t understand!!! The most exciting part is what comes next!!??
@@r1ckySV DEATH COMES AFTER, AND WHAT U GONA DO IF U DISCOVER THAT THERE IS A GOD AND YOU INGNORED HIS SIGNS? YIKES
Drago0610 some extremist tell you of a hell and eternal fire which in my humble opinion is not true. Yes, what you do in this life does matter but just as long as you don’t cause harm or loss to anyone, then you cannot go wrong!!!
Time actually started on March 3rd, 1923 when it was first published
Delighted to see him credit Vesto Slipher. Often overlooked in Edwin Hubble’s story.
A math professor I knew said that the term "singularity" should be replaced with "DMW" -- standing for Do More Work.
Try philosophy in the equation. The singularity = duality. Math is order and control. Our universe is controlled chaos. 😆
Really? What kind of work can be done on "1/x"?
A singularity just means that your formula doesn't provide meaningful answers for the given inputs. When it crops up in physics it doesn't really tell you about reality, it only tells you about the limitations of your understanding of physics.
Actually it started an hour earlier. Due to daylight savings time/
what if you werent on earth
@@baalsguestjar106 bruh, the entire universe follows a 24h-cyclical time system. This is common knowledge 🙄
Baalsguestjar space light saving time obviously 😁
@@pranavlimaye LMAO
@@pranavlimaye If you have no idea what you talking about... dont
Although I understand English, I need subtitles for this.
Me too kid, me too.
6:00 i'm an artist, a graphic designer, and an animator, i worked on the 1999 BBC "the planets" series, and i've done numerous videos for ESA and in program graphics, so i like to visualise stuff, i watched a sabine hossenfelder video this morning about this very subject. i have to say though i find it incredibly hard to visualise a singularity becoming an infinite size, and in fact i thought i had heard that hawking had done away with the singualrity, er, thing. anyway, when it comes to tiny things being infinitly big, this is why i like penrose aeons, he implies that as the end of the universe has only photons moving at lightspeed, size and time have no meaning, so no matter how "big" the universe has become in it's expansion, it now has no "size" and we have our "singularity and a big bang again. only as time has only just started, it's the first big bang.
6:27 ahhhh.....
it's an uncomfortable thought but just as we have only the one life, and that is so hard to accept we invented relgion, maybe there is going to be just the one universe, this is it, never to be repeated. even more reason to try to leave a (good) mark.
I think his sleeve caused me to have a brain aneurysm.
I hate you for making me notice that
Thanks for pointing that out. Ruined the video for me. Appreciate it.
Right or left?
The knitting of the shorter sleeve started before time existed.
Is it the sleeve or just the neck being pulled to one side?
Me: *watches the video in a relaxed mood*
Matt at 10:35: "...unless we bring in... [pause] ... S T R I N G T H E O R Y"
Me: *shivers and starts to sweat*
My grandmother always said the world revolves around knitting.
it all comes back to cycle of life. it envision that universe will end by black holes consuming all mas in universe than consuming one by another. if that happends at end there will be only one black hole. what if that last black hole will reach its limits by overloading and overheating with pressure and mass and break and by doing that will throw all mass as basic particles in every direction with "big bang" (you see where im going :D) neighter eqq nor chicken was first :D the ultimate paradox :D
@@alibabapirce9782 There are already black holes which are not gravitationally bound to one another. They will never contact one another because the universe is expanding too quickly already, and is accelerating still.
BRANES !!!
I feel the same way
Might the "now" moment be how decoherence is expressed in the time dimension of space-time? So, in space we experience solid matter (as opposed to the wave it emerged from) and in time we experience the "now". The implication would be that time is emergent from mass, not fundamental. Also, the arrow of time would therefore be the result of our continuously expanding universe, which in turn "stretches" all matter, which in turn generates a continuous flow of new "now" moments. Another implication of this way of thinking is that entropy is the result of our expanding universe.
...no, entropy is not caused by the universe, it's a local phenomenon, and this doesn't address the question at all.
@@joshyoung1440 what do you mean "local phenomenon"
I'm rewatching a bunch of episodes these days, years after I first watched them, and it's fun to look back and see how I responded then.
I love watching these, my understanding is still that of a teaspoon of jam though.
I feel the same way. I've seen a bunch of lectures/videos, yet I still have trouble grasping the whole concept.
Yet I refuse to give up until I learn. I MUST KNOW!
Yes! I’ve been watching PBS and many other videos for around 8 months now. My understanding is way way more than it used to be. If you’re willing to watch the videos they recommend you’ll fly through!
Don't worry, neither is theirs
I get brain matter oozing from one ear and smoke billowing from the other when I watch these videos, but I love them too!
These kinds of topics are why I love the scientific method and physics/maths as a whole. I'm not good at the mathematics, but the concepts will *always* fascinate me.
Ironically for the next break through in science, we need someone who is not stuck thinking maths is the best method in measuring everything. Maybe there's something else? And by the way I don't mean supernaturally (because it sounded like that). I mean someone who can think outside of known science.
Therefore you're in with a chance still, even without the expertise in maths. ;)
Same here 🙌
@@kimsland999 While that's very true, getting any sort of statistical significance without rigorous mathematical testing would be damn near impossible. You'd be laughed out of any scientific establishment if you posed an idea that's *too* whack, y'know?
Just look at cold fusion for an example. That could've worked, but due to the controversy, it flopped... Even though we only just need to figure out how to create muons reliably for less than 1GeV. Or another example: string theory. That's widely no longer accepted and is very rarely discussed because it's largely unfalsifiable.
@@_XRMissie I was thinking along the lines of (known) Dark energy (and matter) ;)
Try measuring that :D (not the volume of, because that's supposedly 'mathematically' known).
@@kimsland999 Good point! We still don't know what dark energy is though, however, there is still statistical evidence of it in galaxies, like you mentioned. I assume it'll be like how neutrinos were first detected, or how we're patiently waiting to observe if a proton decays.
We should drop all space exploration and focus on finding what's north of the north pole
It find a measure of comfort in that so many people subscribe to this channel , and comment on the vids.
This channel mantains the highest level of understandable complexity in every video and i love it
This is not a universally true statement as it heavily depends on the capability of the viewer.
@@yvesnyfelerph.d.8297 Omg, hahaha. Going about this in the manner of proofs I see
@D. A. look, the comment is as subjective as it gets and you seem to clearly have an issue when it comes to logical deductions.
No one panic guys! @@yvesnyfelerph.d.8297 is here to save us from ourselves by reminding us all what an opinion is. God forbid anyone foolishly construe El Trabuco's opinion as an axiomatic truth or objective property of our reality.
Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D. Yves Nyfeler Ph.D.
felt like saying your name a million times for comedic effect.
@@djmarioc For me to answer that question first you will need to define what you mean by God.
I have a counter question for you:
What kind of vernacular do you expect to be present here in this youtube video's comment section if not for common colloquialism?
Boss: I need that writeup ASAP, we're running out of time.
Me: But what really is "time"? How do you define "soon" in the context of an infinite universe? What is now? What is then?
Boss: ....you have until the end of the day.
When someone tells me we're running out of time, the tangent my mind takes is:
"Cannot run out of time. Time is infinite. You are finite. Zathras is finite. This... is wrong tool."
"You didn't specify frame of reference, so I used a Mercurian day. Which is 1407 hours."
Boss: Let me rephrase... you're fired.
What is Time?
th-cam.com/video/8OvltlOA8XE/w-d-xo.html
Time is a tool you can put on the wall or wear it on your wrist. The past is far behind us, the future doesn't exist.
At times like this I regret not taking advantage of the improbability drive option for my ford prefect.
I love watching these before I go to sleep
"People love cyclic and regenerating universes. They appeal to our sense of narrative."
I throughly enjoyed hearing this. It was insightful, nonetheless wondrous.
I agree. Cyclic wave universes tend to resonate well with me.
@Astute Cingulus Yeah...I feel there is a point in humans wanting to have eternity around, because our brains can´t really deal with mortality.
The multiverse is made of narratives. The most elementary thing that exists that had a beginning is a narrative . All the other stuff, space, time objects both macro and micro are all entirely dependent on narrative. Without narrative there is nothing! How do you like them apples. :-P
@P Sigh Ko If I read The Washington Post, I'd be one of those people who think total nonsense is really deep.
@P Sigh Ko Yeah, just like a nobody third rate physic graduate called Albert Einstein came up with the solution to the Michelson Morley experiment! :-)
Last Space Time before my cosmology exam on Tuesday. :) Wish me success, y'all!
Brianboy9494 ok good luck!
I wish you faliure😈
(Jk)
It's easy, just spout all the BS on these videos and you will pass and be as dumb as your examiners. LOL
Good luck, mate
Love this channel! Please continue to keep illuminating us.
Random Theory: Time starts as soon as the first time machine is made, and warps around that point, Better Theory: Something had to witness the Big Bang for it to happen, so
AFAIK a wave function collapse occurs when an event is witnessed that is the result of some quantum event. Therefore, since we witnessed the universe, the big bang happened.
DasAntiNaziBroetchen (Travel back in time with me) So, at what point does a wave function collapse? At the Big Bang, how do you collapse these wave functions without an obverser? How does the observer observe as a wave function?
3 ;)
The geodesics of your t-shirt are all over the place.
Symmetry breaking is what made the universe interesting
Can't. Un. See. Was. This. Comment. Really. Necessary.
is this guy Mr Bean?
I had to scroll down to get away from his left sleeve and you draw me right back into it.
Where will you be when the lsd hits?
***This episode describes perfectly those first seconds when my alarm wakes me up...***
Absolute confusion about where you are who you are and what your existence even is
Sometimes you must hurt in order to know, fall in order to grow, lose in order to gain, because life's greatest lessons are learnt through pain
-Shazistic
Isn't the big bang STILL happening, everywhere, since the universe is still expanding, and apparently it is currently accelerating its expansion.
When people say Big bang, they are referring to the beginning of physical properties and the inflation period. Not really the expansion after inflation ended
So its like an after explosion? and we live in the middle of that exploded singularity?
@@dirtyactsatdonedirtprice4547 best analogy I can't think of is this.
Universe is a open field.
Small bomb goes off in middle.
That's the big bang.
Was a tiny area that expanded super fast into a larger, but still small ish volume. That was the inflation period.
The explosion started a fire.
This is the period we are in right now.
The expansion from the explosion is gone, but now the fire is now growing more and more.
This is the future period of the universe expanding from dark energy.
Everything is now all burnt and gone.
That is the heat death of the universe
Yes. So thats why it is meaningless to ask what happened before the big bang as it has always been happening.
@@dirtyactsatdonedirtprice4547 Well there is no explosion. And we arent in the middle.
Last time I was this early the time had not even started yet!
Lol
@@IzzyData okay at the worst, he was exactly on time, still not bad going
@@IzzyData I knew somebody wouod ask that question lol.
His shoulders are skewed because of too much driving with one hand on the stearing wheel...
@@AdilKhan-gd2sc Or scoliosis.
Me: I am going to sleep at 3 a.m.
Me at 3 a.m.: Did time start before the big bang?
2:49 for me, i should not be thinking about the big bang rn
3:19 am :P Shall we "start" a club :D
@@jacobnight I don't get the "start", mind to explain?
My comment was written at 3 a.m. in case it has something to do with my grammar ;D
@@mapffff it's a pun. Watch beginning of the video 😉
2:53 lol
Matt O’Dowd loving your videos keep it up. We are still a young species learning our knowledge however will slowly understand through people like you.
Big up Matt and all who seek to understand
Poetic to think that we all start out in life this way, our minds expand into a mini universe and our eyes look like galaxies.
If all points were the same, does that make the singularity... pointless?
eh what's the point?
@Zephyr Smith thats the point!
@@yesguy245 "Signs point to YES" - the magic 8 ball
I'm just worried about setting my clock to the correct time if I visit a pole :/
Point taken
When we compress the space into a single point we imagine that point as a point in space, but remember that point is what is left of space itself
thx. Now my brain just melted.
Point is a _method_ of knowing reality, not reality.
actually that point has no space to it you infinite goes in both directions as small as you can comprehend or as big. Re read Horton hears a hoo
The fun part is then thinking about what this geometric point is contained in. Even tho it has no dimension at all, what is it not existing in?
@@adbon6279 this is what I've been seeking an answer to for over 2 years....cannot find anything approaching an answer tho.
Matt is the man for breaking these great subjects down for the masses
I just took a fat rip and I’m 3 sheets to the wind. Perfect video for the occasion
Couldn't keep focus on the story. Off the balance sleeves got me distracted.
TheSerbian cant unsee now jesus
🤣 why you shouldn't read comments, whilst watching.
You'd think he has a producer that is supposed to catch these things.
It's the whole shirt; see the neck. It's all relative though. Maybe each frame of reference can determine a different position of the shirt. Maybe precisely measuring the shirt's speed to know it's stationary relative to his body leaves you unable to measure it's position. Or maybe it's just something to do with clothing entanglement.
Wow I didn't even notice till I seen your comment but fuck
I love the topics of the Big Bang and time... fascinating stuff as always!
I did too until I discovered it is all abstract "mythamatical" CGI non-science.
@therealnightwriter except he's been thoroughly debunked, and you're a dropout. galacticinteractions.scientopia.org/2011/01/14/one-of-astronomys-pet-crackpot-theories-non-cosmological-quasar-redshifts/
@@aubreydebliquy8051 wrong, stupid. Your lack of imagination doesn't debunk shit.
@@aubreydebliquy8051 Awwww is all of this way above your widdle head?
Anyone else finally figure out what a geodesic fold from Star Trek Voyager is? Thanks PBS Space Time.
I appreciate that the host wore his best T-shirt for the occasion.
But what about the alternate timeline in which the camera guy told you to straighten your shirt?
What about it?
These videos work as ASMR so well for me. It's not that they're boring- far from it- it's just they make me think so hard my brain just gives up and switches off. Also this guy's voice is super relaxing and calming
I can relate to this. 👍
Theo Sivyer
I feel the same for most videos where a British voice explains anything technical in nature.
Intriguing. Calming. Zzzzzz.
@@stevedoe1630 he's Australian
Theo Sivyer
Oh, ok. My ear is not as discerning. Maybe next time I should reference a “British, British colonial, or post-British colonial accent”.
A very well done summary of the topic that was helpful to us mere mortals.
Time seems like more of an emotional construct than a rational one to me
Like identity and actually, intrinsically linked
Light travels from the sun to your eyes. It takes 8 minutes. Time is not that abstract. Duration through space.
The Big Bang was nothing like we were taught.
Matt, they didn't teach us anything about the Universe when I was at School.
I graduated not too many years ago, they still don’t teach it
They teach jack shit. Just some basics about newtonian mechanics, and i mean pure basics. Plus.... a bit about the sun, solar system, and elements. But thats it.
What I learned in school about the Universe was seriously outdated. Like hundreds of years outdated. Honestly surprised the word Aether wasn't ever used.
Technically he never said in School. On average people only know it was an explosion that started the start of the universe. They do not know anything else
Katy Leaton Well unless you go to University and do a course in Physics, where would be taught this anyway, it's the only other place you would learn it.
When people say it is just a theory, it means they have no clue what that term means in science. Gravity is just a theory but I don't see them walking in the sky
You don't?! Hrrmmm, should I cut down the shrooms?
@@mugwump7049 All in good time, my friend. All in good time.
They confuse "theoretical" with "hypothetical".
Gravity is not a theory. The possible *cause* of gravity has many theories.
In essence, without shrooms one will never know the actual cause of gravity.
let us pray
I thought Gunth's Inflation Theory had been brought into question by the recent discovery of things much older than we expected, eg the Methussila star??
Finally a Spacetime episode I understood. 😉
3 Things I love about The host:
Explaining any theories about the origins of the universe
His Wholesome T-shirt
His calming voice that I can use to focus on study or fall asleep to and set the video where he explains a true theory of everything as my alarm clock sometime in 2023 or 2030.
Truly a breathtaking host and channel.
John SliverWick yea I agree, I love matt. He’s definitely the best host that pbs studios has out of all its networks
Someone once called him an actor instead of a true physicist .. he felt highly complemented 😂😂😂
Someone once told me that time was a predator that stalked us all our lives. But I rather believe that time is a companion who goes with us on the journey and reminds us to cherish every moment because they'll never come again.
[Jean-Luc Picard - Star Trek, Wikiquote]
Time is a wonderful healer, but a lousy beautician.
I'd still pick the invisibility cloak
Gayyyy!!!
Time as a cosy companion teddy bear? Not while we're all dead in the end.
That line always didn't sit well with me, it's trying to sound optimistic but really just saying there's nothing you can do about it so just accept it. You can cherish all the moments you like, it still stinks they go into the past forever and never come again, and that no matter how active and accomplished you are, there's never enough time for everything and you're always forced to make compromises somewhere. So yeah you can make the best of it, but that doesn't mean it's good just because there's no alternative. Time hovering over your shoulder reminding you how finite and limited your journey is certainly doesn't sound like a benevolent companion to me. Enjoy it, sure, but I'd still rather be less constrained by the passage of time.
Excelente vídeo. Philochrony is the theory that describes the nature of time and demonstrates its existence. Time is magnitive: objective, Imperceptible (intervals) and measurable.
A bit pleonastic description of the limits of GR in relation to the Big Bang, though with the smoothest voice on TH-cam. Do a video on Klein Kaluza, would love to hear that !
The problem I have with cyclical and regenerative universe theories is that it doesnt actually solve where the Universe came from. It just shifts the beginning back to some point arbitrarily far into the past
Zach Prewett it’s also practically not able to be tested. Is it just me or do these other theoretical models seem like work arounds for a physicist’s dislike of singularities?. Why not just leave it at “we don’t know”? Especially if these other models are untestable and speculation at best... idk can someone help me out here or am I totally off point 😂🤔?
Indeed, but it's not impossible. It's like a movie with time travel in which the events of the movie occur _because_ someone traveled back to the past, but they traveled to the past _because_ of the events of the movie. A self-sustaining time loop. There's no reason for it to exist, one could cut the loop and have a perfectly fine timeline, but the loop is itself at least internally consistent. There's no reason for it to exist, but there isn't really any reason for it not to.
Of course, we could always fall back onto "God did it" (which, interestingly, could allow for a cyclic universe but with a distinct beginning), but I doubt this will ever be a satisfying answer for most scientists. Even if we assume that some sort of supernatural entity created the universe, we'd still want to try and figure out what mechanism they might have used. Once we start involving the supernatural, though, we have to be prepared to admit that such knowledge might be beyond our ability to discover or comprehend. And that's not even getting into the potential origins (or lack thereof) of such a creator entity.
Basically, any explanation or theory we try to come up with inevitably raises more questions than it answers. Maybe some day we'll know more and be closer to a real answer. Maybe we won't.
Neither do any theory.
This requires far more brain power than I possess
Have you tried downloading more ram? 😂
Think smarter, not harder. Conway's Game of Life where cells don't get processed at the same time could help.
Peanut Don’t worry, just believe in brane power
Did you mean BRANE power? Haha 🍄
Yip, I gave it a thumbs up, but know I need to watch it again... and again !
Now that's a cool rock band name: "The geodesics approaching the black hole singularity become the geodesics emerging from the new big bang singularity."
I always assumed that spacetime was just a medium and the big bang took place within it, rather than actually creating it
A common misunderstanding. This is why people are often so confused about asking if time existed before the Big Bang. They either forget or don't understand that time is simply a dimension. It doesn't encompass "all things that have ever occurred". It is a very specific thing. When talking about the origins of the universe the dimension of time doesn't even exist yet. That doesn't mean events didn't happen before the dimension we call time. You just couldn't measure it using the methods and devices we have for measuring time because those depend on spacetime. That would not have existed yet.
My OCD is in hyperdrive.. I want the other sleeve to be at the same length!
I'd say there was some kind of sleeve fluctuation in operation.
Gun show 💪🏼
Hahaha! I was about to write something similar! 🤣🤣
I didn't even notice. Says a lot about me.
@@jimmym3352 Between the sleeve and the shirt's neck... I felt like I was shocking in vacuum space!
Came for the topic
Stayed because i don't understand anything
Me too! 😀
That epiphany is a good sign of intelligence.
You're not alone!
Welcome to the club. Neither does anyone else. All these theories are highly speculative and untestable pseudo-science.
@@jessstuart7495 It is actually testable we have eliminated gravitational cyclic universe because observable universe don't have enough mass. Eternal inflation can also be tested with statistical analyses of mass distribution in early universe.
5:20 - 5:50 explains everything. I’m OK now. Moving back to listening to a Zappa album, whichever.
Is there a place where I can find some more information regarding this topic (articles or papers that were used for this video)? I want to have a discussion with a prof, so I want to get more information. Thank you!!!
People who say "it's just a theory" literally don't know what a theory is.
In part because the colloquial use of "theory" refers to actually a hypothesis.
Did you know that English is also used in non-scientific contexts and more than one meanings can be associated with the same word?
Well let's just say it's all speculation.
@keecefly unless you buy the box of chocolates with just peppermint
Affirmative, there is a fine difference between a “theory” and a “scientific theory”. A scientific theory is well-tested with verification using logic and evidence. Just because it is not 100% final correct doesn’t mean it is just an educated guess. They are simply the closest to what is 100% actually correct in terms of humanity knowledge.
I've always been curious if the flow of time was always consistent. We estimate the universe is about 13.5 billion years old and that it expanded almost instantly. Does anyone consider that the flow of time may have been slowed considerably while the universe was so compacted and dense? That a billionth of a second may have lasted an eternity while everything was expanding?
Good question. If everything was together then the gravity would be super high so time would go... slower? Faster? Idk
Time would not run slower. It only goes slower to an observer outside of the inertial reference frame aka the universe. Inside the universe time would run normally. Clocks go slower in high gravity relative to a clock in low gravity, but the hight gravity clock doesn't experience anything differently.
@@generalzod2499 -- totally badass way of answering the original ponderance.
@@generalzod2499 But aren't we looking at the beginning of the universe from our frame of reference? That first second might have felt likea really long time if you were alive in that first second.
@@gert-janbonnema but not as long as waiting for the clock to finally reach 3:00
Thinking about longitude, would it be possible for time to reach its end, then tick backwards until the big bang?
The fact that I watch this and find it entertaining lol
Looking forward to the coming cosmological episodes. Also, props for the animator, real stellar!
The animation was almost psychedelic and hypnotic.
@@TheCimbrianBull Yep, everywhere you look there's a empty space line of sight..
What did you expect? the graphics was done by Leonardo after all :)
@@StefanHaasbroek All hail Leonardo then! :D
The quality of graphics in this episode has expanded by a factor of 2.
Always interesting, thank you.
this was incredibly hard for me to understand, either I’m drunk or I just need to go back to school. I definitely need to go back to school though.
Me: ooo a new Spacetime video
Me 15 minutes later: how tf do we and our universe even exist to contemplate like this?
Out of necessity. If intellegent life wasnt around to contemplate and appreciate what a "universe" is, then would it still exist?!? So I think by the right circumstances cosmologicaly and necessity of self preservation. Lol
Me 15 minutes later: What even is 15 minutes later?
@@arik_dev lmao
How else does consciousness expand but to put things back together?
@@jonboshears7767 yes. and falling trees make noises when they fall, even if nothing is around to hear it. lol
Stephen Hawking has left the chat.
Albert Einstein has left the chat.
Love this video, fantastic effort to go so deep.
"Did time start at the big bang?" "Yes but actually no"
The connection of big bang with black hole is profound.
4:20 *It's REWIND TIME.*
*AHHHH, that's hot... that's hot*
I love the asymmetric T-shirt! Nice touch.
Lol
Super Asymmetry :)
spontaneous symmetry breaking
Violating CPT-shirt symmetry...
wrg, n osuch thing as get or decenx or not
The discussions about before the big bang, brings to mind Penrose's CCC (which I know you've spoken about). Could you say something about the relationship - if any?
The big bounce doesn’t require that the universe is also cyclic ie re-bounding. Finding what was there prior to the big bounce is simply a case of running the Einstein kartan equation backwards before the big bounce which is possible since there is no singularity
I love how this channel makes me feel I almost... almost... understand what Matt is talking about.
I don't always understand everything (or in some videos anything) but I find it helps to go back and replay certain points. Sometimes a bunch of times.
@@Kevin_StreetThat Is definitely true.
My brain always hurts after these videos. I really ought to go back and rewatch everything in order to understand better.
"Matt, get over here! We gotta film the next Spacetime!"
"Oh, sure thing! On my way!"
"...Matt? Matt, what the heck? Why aren't you wearing a shirt??"
"...I... I need a shirt?"
"DUDE? THIS AGAIN? Here... just... just put on this.... let's get on with this..."
Andrew Brown BaHaHaaa! Thank you!
This makes exactly zero sense
Dead XD
I am in no way qualified to expand on any of this. However, I do enjoy constructing a sort of rationalization that may well be totally wrong, but I do like the sound of.
And so I thought that if time is the temporal space between any given events, then time seizes to exist if there are no events. Or at least time enters a stasis if there is no physical space for events to occur.
And so a singularity (would be) so dense, as to be zero-dimensional, would not allow for energy to move in a way that makes any events so close to be indistinguishable from one another, or even to be considered the same event, in which case the event becomes a non-event.
I know that this is just musings of a restless mind, and I would love to hear if anyone else have thought about time in this kind of thought-experiment.
I have zero training in physics (so corrections are welcome) but my impression is that this matches up with GR's view of time. A measure of causality based on events. The clocks only start when things get going. Without time, there are no events. Without events, there is no time.
There is a french video of a scientist that says in the first moments of the big bang time wasnt only forward, then something happened and time became only forward.
Amazing! I love these sort of topics, PBS Spacetime always delivers 10/10
@Kisra David when?
James Hoey r/woosh
So, WHAT is time? And what is causation?
Was time in some way still REAL before the Big Bang, in the form of curled up Kruskal coordinates? Was it not LINEAR perhaps, back then?
Kudos to PBS Space Time! You guys really do a good job in explaining super hard things in a way that simpletons like myself can (almost) understand. Outstanding videos!
fuck i hate that word
@@jackkelly324 lol which one?
@@blakeb9964 "videos"
@@blakeb9964 'kudos'
All PBS videos are fine, dandy and clear up to one point when it's not anymore...
Everything started with us. Before 'us' there was no definition or recognition of anything at all therefore 'time' didn't begin until we conceptualized it and gave it parameters.