How Many Universes Are There?
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- čas přidán 20. 06. 2024
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The universe is big, but it’s peanuts compared to the eternally inflating multiverse. But just how many universes are there? What are they like? And most importantly, what can they tell us about … aliens?
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Imagine it: the observable part of our universe is 93 billion light years across, and that’s just a small fraction of the stuff created in our Big Bang. But in the eternal inflation picture, ours is just one among uncountable bubble universes. Bubbles that are continuously appearing and growing within a vastly larger spacetime that itself expands at an exponentially accelerating rate. A greater inflationary spacetime whose expansion never ends. We looked at the bizarre idea of eternal inflation in recent episodes - but we stopped short of exploring the full implications of this proposition. Those implications are, frankly, completely nuts. Some may also be true.
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"Some questions spring to mind: - I mean, besides 'What?!?'"
I guess he reads the comments after all.
The answer of course is.. ........42
Funnily enough of all the topics on here, the graphic accompanying that statement painted a completely clear picture for me, for once!
I mean I know what a Big Bang is
@@oldman2800 I disagree. I think the answer is aliens.
Has got to be the best one yet:
Some questions spring to mind. I mean, besides: “What?!?”
no such thing as best or not or that, say, think any nmw and any s ok
0:41 "Bubbles that are continuously appearing and growing within a vastly large, *spacetime* ."
*video ends*
Lool
yes
Yeah, I automatically thought it ended, so I quickly zoomed out, locked the screen, crashed my phone on the ground, and detonated a nuclear bomb.
This stuff really breaks my brain, but I love it
Even though my mind can't comprehend everything they're saying, I like this channel lol
Fb: #lock3dinthesh3d
Your minds cant comprehend something that does NOT exist.
Lol
I take solace in the thought that an alternate version(s) of me in another bubble universe(s) knows exactly what Matt is saying.
*Somewhere, Something Incredible Is Waiting To Be Known*
_Carl Sagan_
becouse that is what magicians do...
I wear that on a t-shirt 😊
Carl Sagan didn't say this. Sharon Begley did when she interviewed him.
*THE MAN OR THE WOMAN WHO MUST BREAK SOMETHING IN ORDER TO UNDERSTAND IT'S PURPOSE WILL NEVER BE ABLE TO UNDERSTAND ANYTHING*
J.R.TolkinLoreMaster 21th century planet earth
@@realpeacemaker7038 Ivan Drago
All these universes, and I'm still single.
*Ooof*
Not in the many worlds interpretation
Me too
I'll be your gurlfriend.
@@fulmarmusic1413 mine too plz?
Best reason to believe in alien forms of life:
We exist.
Best reason is the FACT of how many worlds are in THIS smaller type galaxy alone. 400 BILLION if not much more star systems and there are billions of galaxies out there. To doubt we are alone is simply dumb.
@@303storm To believe that 400 billion is a huge number in the grand scale of things is also pretty dumb.
Whether or not alien life exists is really not a very relevant question, though. What matters is whether we will ever possibly interact with it.
@Chris Chu
Supposedly trillions of galaxies, based upon the latest info.
I have a video in my playlists about it, on another channel.
And I think you meant to say "To think we are alone", the word doubt is to disbelieve which leads to giving up, wrong word. : )
@Winston Deleon
I disagree, that's thinking small or "short - sighted", and having too much doubt.
The way our emerging technology is coming so fast, and our good innovation, I do believe we will find some bacteria / micro - organisms, and maybe animal / plant life on other planets.
You can never say for sure to the absolute.. that we won't find anything or even intelligent life.
Because we don't know yet until we search, look at the moons around Jupiter and Saturn, oceans underneath one of them that could have bacteria that could be slowly changing over time "evolving" spoilers God does create different species of animals, other than humans. And there might even be aquatic life in the ocean underneath the moon's surface that is around the other planet, or just bacteria if nothing else, and Nasa is excited to find out.
They also find new planets all the time, I think there are 4 to 19 new planets discovered every day in our Galaxy, and especially close to our solar system, in other solar systems nearby.
They have noticed the little black dots that they thought were sun spots, going around other stars in other solar systems, were actually planets, so we are discovering a lot of new things all the time.
Our space transmissions / communications are advancing with emerging technologies, look at Nasa's Mars CubeSats 1 and 2, they were able to transmit data from Mars to Earth in 3 minutes, for future "solar system" communication, and I think that technology will mature over time to be faster for wider ranges throughout our solar system.
Look at Quantum Teleportation, Australia plans to build a Quantum Internet by 2030 with this emerging technology, to share with Europe, no word on the U.S.
The Netherlands plans to expand their cities with their Quantum Internet, and share it with the world in 3 years.
Now imagine using that same Quantum Teleportation for small things like Data transmission / communications for space communications.
If you are wondering about everything said, you can find everything mentioned in playlists I have on another channel.
And if you are curious about emerging technology and beyond, to get a really good idea on what we can do now, very soon "few years or less", or even a little later after that in the 2020's, also check my playlists.
------------------------------------------------
I was giving out helpful links, but it won't allow me to do that now, so I made playlists.
1. Check my channel, find a subscribed channel called Technology Research, go to the playlists there, and click "created playlists", that should show them all.
2. After that, click on the title / text of each playlist, not on the pictures.
3. Don't forget to click the "more" button in each playlist description for more articles and playlists.
This is absurd, “humans exist, therefore aliens exist”? This is logically invalid.
If bubble universes could potentially have different laws of physics, what laws would describe the bubble universes that form from their collisions?
could that multiverse be a bubble universe in an other multiverse ?
If there is infinite possibilities there’s a uni where i got a stando and a uni where your theory is true.
Also, if bubble universes are generated when spacetime stops expanding in one place, how does a stop in expansion in an area change the laws of physics of that area?
Yes, the thinking that they r "inflating" Or expanding just like ours, at the same time as having different laws, just doesn't sound right, it could be that they r out of our human understanding? If they have different laws, how can u say that they r inflating?.... There might as well rightfully be no words to describe them.... This is rlly addicting stuff
If the laws of physics are so different wouldn't everything be and look different and Incomprehensible? A bubble would suggest it resides in the same space.
I love this series but I was admit it is forever over my head. I lack the technical knowledge to grasp these subjects but they fascinate me deeply.
Yay progress though keep at it!
@Michael Lochlann Matt admits he loves physics jargon too much to simplify things for the average person. I think it makes this channel pretty unique, it's definitely not for the faint hearted. Like you said, physics books and conferences do a much better job at simplifying so if that's what you're after those are a great choice!
now i am curious as to what two "Universes" colliding might potentially look like. how might it effect physics within the area of overlap?
Vacuum Decay maybe?
Bootes void
@@valjean76 The Great Attractor
I'm guessing that the universe with a lower-energy vacuum state would win out.
Assuming the dark energy, and dark matter quantum exponent between both universes is not equal to the quantum exponent of matter, then one universes would cancel the other out in time as space would differ.
The Exponential nature between what was found during the findings of the Higgs Boson, a photon could travel between universes and the dark field would cancel out.
1:59 so it IS true: our entire universe is an oil bubble floating in a jar, placed on a shelf, in an alien's child room as a science fair project that got a C- 👽
Yes. I strongly believe that.
That just makes me think about it even more
Yours maybe, mine got an A.
"Some questions spring to mind ... I mean, except "What?!" made me laugh so hard, I had to rewatch that part a few times
Q: How many universes are there?
A: All of them.
The answer to your question is yes.
@@Gr3nadgr3gory That would've been too obvious.
@DigitalDan As many infinite possibilities as your imagination, at least until we figure out a way to observe it and it settles to something relatively more mundane.
Keep your mind open for all possibilities, but remember that science follows facts whole fiction follows dreams. It's always great when they overlap, but important to remember the distinctions between the two.
Sounds like we're coming up on the edge of our current knowledge of inflation. Curious what the next major theme will be.
All of them...ALL of the universes
the many worlds theory has flaws there is a video that very constructively debunks not a fan of the MWT but I am a fan of time travel not our bodies but our conscienceness kinda like that wolverine movie where information is transported and we know the speed of light may be a constant but there is stuff out there that shits on the speed of light
The whole time he was talking about seconds, I kept wondering how seconds would be measured on a multi-universal scale.
Jacob Opstad time dilation has this flipped over completely
It's kind of assumed that there is a "time" dimension (that may or may not be linear) that exists as a shared parameter in the calculus between all the universes. The inflaton field, where the bubbles expand inside and collapse randomly in, has it's dynamics, and I suppose that dynamic state can define time for all worlds. (Or you could just define time as the number of universes currently existing! Since the spawn rate is faster than our plank-scale theoretical limits of measurement, that would be more than good enough as a multi-universal clock.)
There would be time if these bubble universes are created in another bubble universe that is already expanding so quick that these universes can start popping up.
And eventually more universes might pop in in these new universes when they olso expanded enought .
I like seconds coz I like pudding and you can never have enough pudding.
“Planets only orbit the sun. Other stars have exoplanets.”
Well gee. That’s a really heliocentric definition.
Yeah I hate the term 'exoplanet' too, but that's what we're stuck with for the time being.
I think it’s just to differentiate between “planets” in our solar system and “planets” (exoplanets) outside of our solar system. It makes sense, but yes it is weird when even though something is technically a planet like Mars or Earth, it isn’t actually called a “planet” because it’s outside of our solar system
I agree. Exoplanet should just be a class of planet based on location. A way to specify, what you are talking about. It is like some islanders live on an island that has one kind of snake, but they refuse to call any other kind of snake that exists elsewhere "snake". "Those are not snakes, those are exosnakes". Silly.
@@ChessMasterNate "Exosnakes" oh my god, I can't breathe :D
@@ChessMasterNate That example is perfect, it also captures the pettiness of the definition; as though 'our planets' are different just by virtue of being close to us.
You're literally one of the coolest dudes I've ever seen in my life. Your wealth of knowledge is awe inspiring.
And I love your narration lol.
Anybody else love it when there’s an episode where Matt says “Ten to the power of ten to the power of..”? I always know it’s something mind-blowing when that comes up. Ok, PBS Spacetime is very often mind-blowing, but “Ten to the power of ten to the power of..” seems to be a special treat.
Tree(3)^Tree(3)^Tree(3),,, where the power tower is Tree(3) high... granted that is a finite number... but it is somewhat big...
It's still less then infinite. Which is curious, when you know that our "bubble universe" itself should be infinite in size since the big bang, but still expands. When you end with paradoxes, you know you are wrong and some of your assumptions are incorrect or only a samll part of the picture.
Power towers are just the stepping stone to higher orders or operations found among knuth arrowed notation.
I spend more time watching videos like these than actually studying
You probably learn more here than in school
Fedora Eagle I’m from the United States but I’m studying abroad until university. doing my a levels currently
@Fedora Eagle my exam grades when I do my homework vs when I don't do my homework beg to differ.
@Fedora Eagle I don't understand how a comment so irrelevant like this one can get so many likes and comments. The world is really turning into an idiocracy.
The truth is your mathematics is weaker than you wish, therefore you watch to escape the fact that you maybe in the wrong field. Or your just bored with your professors.
How many ways do you want to experience yourself ?
Universal consciousness: *Yes*
@Greg Jacques Lucifer's Jizz Gargler In one where the Nazis won, and order is restored
I cut my finger chopping vegetables.
A hasty healing to your wound, my friend!
@@jeffreysaker9528 Thanks mate, it seemed to magically disappear
Look at you my dude, first person to see another’s prayers come to fruition!
Thanks for covering the planet definition issue in detail at the end, and giving air (finally) to the biggest problems with the definition. Great show as always.
Again, my brain is currently melting down while simultaneously expanding at an insane rate!
I feel the same...and somewhat intellectually inadequate
PBS Space Time: "How Many Universes Are There?"
Inflation: Yes
"Ancient astronaut theorists say yes."
Please do not trivialize such important matters. Go on some Chemtrail bull shit page to do that.
Best possible joke for this video!
Poes Law Haha yes I agree. Contrails are quite real. Though if you notice, I typed Chem, not con-trails. But pretty sure you're joking. If so, good one.
@@Skylancer727 hahaha...you surely often watch ancient aliens
I like that Hitchhiker's Guide reference at the beginning
I absolutely adore this channel, I'm often amazed by the content. However, this particular video blew my mind.
These videos used to go way over my head but now I can at least hear the wooshing sound they make.
p r o g r e s s .
Keep looking up and it will be looking up
Hear hear!
Jerry Rupprecht They probably got slower
My mind wasn’t ready for this on a Monday afternoon 🤯
I've been fascinated by this inflaton field and watching the last few Alan Guth episodes over and over. I also tried watching some of Guths lectures but this feels like it hits the homerun better in explaining what Guth is really talking about.
I never knew that vacuum space had such high POWA!
Can you use tetration instead of exponentiation in order to keep track of the number of bubble universes in the multiverse, as a function of time? I haven't yet seen a practical application for tetration, but if there is one then this surely must be it.
You would likely need several more degrees of higher math functions than that to keep track of all potential universes out there.
"Space is big-"
Me-"You just won't believe how vastly, hugely, mind-bogglingly big it is. I mean, you may think it's a long way down the road to the chemist's, but that's just peanuts to space.”"
I love Douglas Adams. Just ‘heard’ HHGTTG in audio book.
@@TheTwick See if you can track down the original radio series, that's the original version.
If _only_ I could have been the 42nd upthumb.....
Well best you don't panic ! Just put a fish in your ear
@@DavidBeaumont BBC series is damn funny, too...
Wow, that was quite a workout. I think I can feel the burn of my brain consuming calories. It'll be sore tomorrow.
D.o.b.s.
Delayed onset brain soreness.. Wait two days before you watch another one or you'll risk over training..
the idea that we are the first intelligent life in the universe, because the amount of universes created each second is more than the last, and so the vast majority of intelligent life is the first, is ... phew. it shakes me.
That same logic seems to make a pretty solid argument against that infamous simulation hypothesis too.
Thanks for making me feel even smaller than I did when there was just 1 universe.
This is a fine discussion, especially the perspective on Fermi's Paradox, but the most important thing I took from this was,
we really need to talk about where I can get that t-shirt.
When I was in college we had this term that the professors would use called theory-territory or therotory. Basically most sciences will expand into their neighboring fields of study. For the softer sciences of human behavior you'd have psychology, sociology, anthropology, and biological behavioralism all trying to explain the same phenomenon within their framework.
I feel like planetary scientists are telling astronomers to get off their lawn. I think there's a good chance that they probably have working definitions and classifications for planetary bodies. Kind of like there are classifications for stars.
Like what is the difference between an astrophysicist, astronomer, and cosmologist. How much overlap are we talking about and how specialized do they get. Back to anthropology an archaeologist and a linguist can both be anthropologist.
Maybe SpaceTime could do a theory-territory episode explaining all the branches of physics and an astronomy.
It would be an interesting episode.
I like this idea for a video!
Perhaps, but there is a channel that is already specialised in this: czcams.com/users/dominicwallimanvideos
LoL softer
When ever I think I've got a grasp on a subject I like to watch your videos to humble myself. :P
So as far as aliens go, it's basically: "Thank you Mario. But our princess is in another universe."
Omg when he started talking about 10 the power over and over I started to smell copper now my head hurts 🤢
Your iron is low. When your body has low iron, you'll get that metal taste in your mouth.
Tony Solar LoL I was making a joke about how confusing that part started to get
Blood tastes coppery. Perhaps he bit his tongue?
Or residual memories of past cannibalism were stoked.
The "Youngness Paradox" seems pretty transparent to me. Although it's true that the majority of sentient life would be in other bubble universes that should in no way interfere with the probability of a 2nd or 3rd sentient forming within the same bubble universe or even down to the scale of a single galaxy.
I think you're right. Couldn't you use this premise to argue just about anything that happens should statistically be happening for the first time? I mean, the number of universes in which someone is drinking tea for the very first time is almost infinitely larger than the number of universes in which tea drinking has been happening for thousands of years. Imagine how many new universes must have formed in that time! But here I am drinking tea, thousands of years after its invention.
I agree.
That isn't really what the Paradox says. It's talking about the probability of us being in a newer bubble universe compared to an older one. I'll try to rephrase it a bit: There's always more first sentient races than second sentient races at any point of time in the 'multiverse', because there's always more new universes than old ones. Because of that it's simple probability that we're one of the first ones. The chance of a universe developing more sentient races afterwards has no bearing on the paradox.
It's also a thing on our galactic scale. Terrestrial planets and the heavy elements to make us are actually relatively new. Thus, wouldn't it be crazy if we were the first. Boy howdy we need to survive to help the others not be like us.
@@Spheniscus_ Aren't low probability odds attained all the time ? Somebody has to win the lottery.
So, bit late to the party, but this video has me asking a question:
If bubble universes can meet (even if they have to start off absurdly close together to do so), wouldn't that allow for the creation of expanding regions entirely contained or "trapped" between a network of connected universes?
In a simplified 2d version of this, you could imagine 4 universes, in a square pattern, so that the edges of all 4 bubbles meet shortly after the pop into existence. But if you timed it just right, and set them just the right amount away, there would still be a region of exponential inflation right in the middle of it. I have no idea what the implications of this would be, but it seems hard to imagine.
Perhaps such a structure would rapidly end up as something like a shockwave as the space inside expands, inflating the surrounding universes like the skin of a balloon?
I'm so glad that this guy is telling everybody what I have been thinking for twenty or more years...
As long as vacuum energy is enough to suck up the dust bunnies under my couch, I'm happy.
I was doing fine. Then the numbers came. My god. The numbers. They're everywhere, especially over my head.
The numbers Mason, what do they mean?!
Man those over your head numbers are the worst
I hate it when universes collide. It makes my hair look bad.
Then stop the universes from colliding! Pretty simple...
I don't know how but theses videos started making sense to me.
Fry: So there are an infinite number of universes?
Professor Farnsworth: No no, just the two.
Those were the only two within 10^-50m of each other, so were the only two to merge within Fry's universe.
Yet they had an episode with Multiple Universes in boxes
@@LORDTHUNDERX that's cuz it was only the two that you could visit like that
All these sounds nice but isn't multi-verse theories/ideas highly speculative concepts that borders on being like religion, fengshui, astrology &/or science fantasy?
@@user-DongJ Or the Democrats' pie-in-the-sky "New Deal" for a kinder, gentler world.
Hi, thank you for a most interesting segment. I understood EVERYTHING you said up until you said "welcome to PBS Space Time ...."
After listening to Kip Thorne explain how there’s no matter whatsoever in a black hole, I really needed my mind completely blown again, and voila! Good stuff!
@dan parker many worlds theory says indeed there are many exact or nearly exact replicas of you in the multiverse.
Perhaps it is oscillating and we are in a period of positive expansion, and the harmonic depends on the size of the universe.
Fermi paradox is about aliens in our own universe, not across the multiverse. What am I missing here?
You are not missing anything, he is talking about fermi paradox exactly in our own universe.
Too sober for this
This is so outrageous. I love it!
I have conflicted feelings about the Youngness Paradox.
On the one hand, I like it because I have been arguing for years now that the reason we don't see anyone else out there is that we're first (because someone has to be).
On the other hand, it sounds suspiciously like the Doomsday Argument which I dislike but I don't know my way around statistics enough to properly articulate my intuition that it's a load of baloney.
I have the same problem with it. There is no reason to suspect that the rate of civilization generation in a single universe is dependent on the number of universes in total. It's not exactly like the doomsday argument, but it does have that same ab initio feel.
What makes you think we are the first and only life? Or the first and only civilization? I am more of a late filter, doomsday tech guy. The doomsday tech is obviously Facebook.
The Great Filter gets them all in the end
@@davidhand9721 Given the conspicuous lack of evidence of any [interstellar] other civilizations out there, and given that the current age of the universe is about as young as it could be to give rise to concentrations of heavier elements (Fe in particular), I think it is not only reasonable to assume we're first (or at least, not significantly further behind in technological development than anyone else currently out there), but imperative that we act and plan as if we are [on the verge of being] first because if there are stakes to be claimed in the galaxy, it's important we plant those flags before everyone else beats us to them and we're stuck being the Alabama of the galaxy with only a single yellow dwarf to our name.
I have conflicted feelings about two-tiered comments. - On one hand it's a great way to join a band wagon. On the other hand, it's just a great way of feigning some sort of creativity you don't possess, at least not enough to do it without a huge blank waste of space that really means "prepare to have your mind blown... but not really"... and, also, "I don't know what a colon is for, like educated people".
That look on his face when he says "aliens" in the intro 😂
"well it gets clicks sigh"
Zsolt Donca OMG, I noticed that too. Almost evil or excited? Hos facial expressions are always very animated. Them eyebrows tho! ;) Wondering too, if he frequents the discord and how many are members now. It's all interesting :)
Listening to Valasse Eruva's album Ascending Phoenix and thinking about multiple universes is an ideal combo
I never understand what this man says half the time but that always makes me more curious and always watch more to understand better
Imagine solving a whole ass universe theory just so you can win a shirt that was made in China for 10 cents
lol they did it for fun not for the shirt
I want my shirt!
lol 2nd only to the Nobel prize
After taking a deep look into strings theorie i thing there are approximately 7 universes in existence
Nice
nice
The other 5 were destroyed by Zeno-Sama
In an endless reality, all possibilities for life would be realized, so even after everything we can see evaporates into radiation, life will carry on elsewhere. It is comforting to think that perhaps, in some distant but similar universe, I am having tea with you.
it's also a rather hellish prospect as it means infinite, eternal suffering. if you deal with mental illness or chronic pain you don't want it to go on forever with no way out.
I don't think personal identity carries across parallel universes. I appreciate the sentiment, though.
@@mvmlego1212 Well, perhaps not. Still, the DNA of every living thing would end up randomly duplicated at some point, so it's nice to think that life itself is neverending.
How Tsundere of you
If using the current limited laws of physics, it may be a very big number but events can only replicated so many times.
Haha I love the HHGttG references. Don’t forget your towel when traveling the multiverse!
I have no clue what your talking about in most of these videos...but I like it!
2:21 That's exactly what I thought while watching the first episode in this mini-series!
1:21 choo choo
I just watched dragonball super and i dont want to spoil the amount of universes😅
Makes you wonder where will Goku next have to go for a worthy challenge?
Over nine-thousand?
Excellent video. Very very interesting. Congrats.
What's fun about this is that we're basically still grappling with the implications of Einstein's theories.
He was in the top 10 smartest people .....ever
I love how the Titles of these videos have questions, No one can answer.
What you dont know how many universes there are? Obviously its ∞-x+¥/time since the beginning of time. All you have to do is fill in those incalculable variables and you have the answer of course until the next second passes and 11 to the 78th quadrillion universe's pop up and you have to add those in.
@@Sentient.A.I. which simplifies to 42.
@@Sentient.A.I. Thanx, lol
Answer: Just the one.
I am now not a no one! I'm a somebody!
*@F*
You took me waaaay too seriously.
They reserved word "planet" for bodies in our solar system?
The future human galactic civilization will certainly come to think this was a totally smart decision
Haha, when he began with "sun" in the definition I thought "No, they could not have made *that* mistake" but this way it is even worse :D
Isn't it weird? :) Planet seems like a generic category not a specific case for our solar system. Exoplanet is just a subcategory.
wrong video
aurell we maybe considered the Mayan calendar .
The definition will change eventually when we get to that point in our history.
Very interesting! definitely need to see the other videos about cosmic inflation!
Excellent video. Congratulations.
Twenty seconds into the video and I'm already hyped af
The multiverse it never ends
It just goes on and on my friend
Some universes
Started popping up not knowing what it was
And now they'll keep on popping up forever just because!
Throughout the multiverse, 'bout anything could be true
Might as well make up anything to believe in
It's made inside of you
@ danwic
It’s a Lambchop Universe
There is a great idea! For the dark side of the Universe - suppose that it consists of short-term interactions in long-lived fractal networks, the smallest quantum operators - Spherical «rosebuds», consisting of a large set; 1 - rolled into a sphere, 2 - half rolled into a sphere and 3 - flat, vibrating quantum membranes relative to their working centers in the sphere.
Good episode. Thanks! Also, I dig the new outro.
Max Tegmark's "Our Mathematical Universe" is a great book covering all of these topics in a lot more depth while still being pretty approachable.
Bogdan Vera An excellent read, and I may have understood half of it. But after finishing it, I came up with two answers, either one or an infinite number as there is simply no logical reason for a finite number of universes.
Tegmark is a mad platonist
@@zverh what's Platonist?
@@yojiviriak675
Someone who adheres to the philosophical position called *platonism.*
@DigitalDan
I am myself skeptical of any position that claims absolute truth. But being skeptical about maths/logic is not easy.
Lol I was just watching the previous PBS videos about bubble universe when I got this notification
Where’s the link to that wee bit of calc required to find out how close the universes have to be to collide I’m very interested in how to do that
Love the new close! Way to go, Kornhaber Brown!
never been lost so early when watching pbs spacetime series T_T
I wouldn't worry too much dude, I doubt any of these theories are remotely true.
@@ChantelStays yep, same here
@@drawmaster77 it's, at least in its current progress is untestable (this is what i got so far from watching this vid), hence it's more like philosophy or tought exercise, although it's backed by mathematics
Then there are plenty that you haven't seen.
@@mgilangr9883 that's not really true. They come up with crazy theory first, then write some equations around the "what if's". If their theory is false, and it absolutely is, then all these equations are meaningless. Think of it like writing a sci-fi novel about space exploration and calculating how fast the interstellar spaceships are flying. If you come up with a number through some calculations, it doesn't make it any less of a fact that interstellar spaceships are science fiction.
The entire string theory is nothing more but a really long sci-fi novel.
If the universes do collide/join, don’t they have to follow the same laws of Physics?
Not sure, but something about gauge theory.
And what type of spacetime is in between the bubble universes?
There is probably just normal space time in between the bubble universes
I would have bet for no spacetime at all if someone is a property of a bubble universe
There is no principle which states that bubbles that do collide must have exactly the same laws of physics (things like coupling constants).
Assuming that the dimensionality of each bubble is the same (3 space, 1 time), then I would guess that what is called a domain wall would form between them, and it would move further into the bubble with the lower value of the inflaton field with a speed proportional to the ratio of the values of the respective inflaton fields of each bubble.
The domain wall is 2 dimensional, so there would be nothing between each bubble except for the domain wall. Passing through the domain wall would likely be fatal to ab life doing it from either side of the bubble, and would likely drastically change the structure of any energy to pass through it.
New evidence supports the idea that we live in an area of the universe that is “just right” for our existence. The controversial finding comes from an observation that one of the constants of nature appears to be different in different parts of the cosmos.
If correct, this result stands against Einstein’s equivalence principle, which states that the laws of physics are the same everywhere. “This finding was a real surprise to everyone,” says John Webb of the University of New South Wales in Sydney, Australia. Webb is lead author on the new paper, which has been submitted to Physical Review Letters.
Even more surprising is the fact that the change in the constant appears to have an orientation, creating a “preferred direction”, or axis, across the cosmos. That idea was dismissed more than 100 years ago with the creation of Einstein’s special theory of relativity.
Read more: www.newscientist.com/article/dn19429-laws-of-physics-may-change-across-the-universe/#ixzz616H9gCH0
@@urinater That "New evidence" is almost 10 years old, and no-where near the 6-sigma needed to be considered "evidence" among scientists.
"But, he adds, extraordinary claims require extraordinary evidence: “That’s way beyond what we have here.” He says the statistical significance of the new observations is too small to prove that alpha is changing.
"New Scientist" is a rag.
This episode blows my mind.
This video made so much sense and answered so many questions i had. The reason collisions are likely rare is that the space between the bubbles is expanding faster than the bubbles themselves. Kind of like us not being able to reach distant galaxies. I just won't to know if there's particles between the bubbles? Or it's just a quantum field?
Why is it I feel like I'm falling into a fractal at the thought of eternally inflating space always overcoming the networks of non inflating space?...
Have you seen a psychologist yet?
2:21 Is exactly how I feel with every single one of these videos.
That's the purpose of this channel, to confuse you, not to inform you.
There are so many good theories out there.
The question is, What happens when they collide? I understand the theory that universes infinitely create in space time, but it sounds as if there’s constant collisions between universes. What happens when that occurs, other than the creation of new universes, because in our own universe, just for a reference. When black holes collide there’s an incredible amount of energy released. So, in space time, the collision of universes simply leads to a never ending creation of further universes? I feel there could be more, and the video briefly touched on it when they talk about dark energy
“Space is big. You just won't believe how vastly, hugely, mind-bogglingly big it is. I mean, you may think it's a long way down the road to the chemist's, but that's just peanuts to space.” D Adams...
Any other CZcams video: reading comments while following along with the vid playing...
PBS space time video: reading comments....erm... wait whaaaat? Rewind.....lol ^_^
Yes so true
14:07 Need more of that existential awe on the wonder And weirdness of the universe? Got burning questions on the nature of reality?
Busting out the Douglas Adams reference right out the gate? I'll allow it.
Sir Isac Newton: For every action there is an equal and opposite reaction.
Quantum Mechanics: For every action there is an infinite number of reactions.
Weeeee... in another parallell universe I am a yellow stone with eyes...
That is oddly specific...
I kid you not the past 3-4 days I've been researching the multiverse theory myself and there is no limit to my delightment when I see PBS make a video on it!
Lots of places to explore!
Had to watch a few times, but epic.
Actually for me the solution of the Fermi paradox in our own universe is a lot easier.
Let's suppose that every coefficient of the Drake equation is really low but not zero.
So, a planet in the habitable zone with microbial life: rare, but not that much.
A planet with multicellular complex life? Orders of magnitude less common.
A planet with intelligent life? Even less common than the latter.
We end up with a probability declining exponentially every time we add a condition to the equation (intelligent life, intelligent life + civilizations, intelligent life + civilizations + technology capable of interstellar travel).
In the end, if we factor in the probability of 2 already extremely improbable civilizations capable of interstellar travel coexisting at the same time in a billion years old galaxy, it seems reasonable we haven't yet encountered aliens
If you think about it, alien explorers could have visited us in the Cambrian, collected some samples and just moved on and we wouldn't even know
I believe the timing is also important. It doesn't matter if 1 million years ago there was an alien civilization sending messages to the 100light-years-away sun. We wont detect them if they went extinct within 1 million years, and a civilization of a million years is a lot!
@@jvcscasio exactly, we have to consider distances between advanced civilizations in a 4D spacetime which could potentially span millions or even billions of years in time and millions or even billions of light years in space
Me: I need to shut off my brain and relax for a bit
PBS Spacetime: How many universes are there?
My second take on my problem with the Fermi Paradox explanation:
One of the ideas, that is often formulated together with the anthropic principle is the idea, that we are a totally normal, average species, and everything about us is totally normal, typical and average.
So, our universe was about 13.8 billion years old, when humanity first appeared, and we therefor assume, that it takes an average universe about 13.8 billion years to produce its first technological civilization.
The Fermi Paradox problem is, that according to all we know so far, and assuming, we are the first technological civilization ever, we don't really understand, WHY it took the universe so long to produce us. The circumstances, that we deem necessary for our existence should have occurred multiple times before, even in the time cone of our observable universe.
So, the multiverse theory by far can't solve the Fermi Paradox, at best it shifts the question from: "Why did it take the universe 14 billion years to produce us?" to "Why does a given random universe on average need 14 billion years to produce its first technological civilization?"
I'm gonna need to watch this nine times
It feels wrong not to end a video with a smooth transition to a comment about our very own *dramatic pause*...space time.
0:00-0:02
"space is big"
you lost me already.
He was also referencing/paraphrasing, The Hitchhiker's Guide To the Galaxy.
[citation needed]
@@willinwoods The actual quote he's referencing is, "“Space is big. You just won't believe how vastly, hugely, mind-bogglingly big it is. I mean, you may think it's a long way down the road to the chemist's, but that's just peanuts to space.”
From (the late) Douglas Adams' The Hitchhiker's Guide To the Galaxy. It's a Science Fiction comedy series; originally a BBC radio show broadcast in 1978, then novelized by Adams, (there are 4 or 5 books in the "trilogy," as he jokes.), and adapted for BBC TV in 1981, and also an American movie from 2005. It's a modern classic. (It was also a popular early text-only PC game.)
@Michael OchoaRomero As I understand it, that is still debated.
"Space is beak."
I like the starting assumptions. Describing things we are never going to experience is called Sci-Fan.
I feel that a quote from Billy Madison would be appropriate here.