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Supervoids vs Colliding Universes!

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Could the mysterious Cold Spot found in the CMB be the result of a collision with a bubble universe? Try 23andMe at 23andme.com/spa...
____________________________________________________
[CORRECTION: The calculated ISW cooling from cold spot observed voids is 0.000032 Kelvin not 0.032 K as is listed on screen, the actual cold spot temperature differential is 0.000150 Kelvin not 0.15 K, and the actual ISW cooling from the control region is 0.000014 Kelvin not 0.014 K. The actual control region temperature differential is 0.000015 Kelvin not 0.015K. Thanks to Chris Morong for catching this discrepancy!]
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Previous Episode:
The Fate of the First Stars
• The Fate of the First ...
Space Time Journal Club examines Evidence Against a Supervoid Causing the CMB Cold Spot
arxiv.org/abs/...
If you study a map of the Cosmic Microwave Background, or CMB, you may notice a large, deep blue splotch on the lower right. This area, creatively named the Cold Spot. Is this feature a statistical fluke, the signature of vast supervoids, or even the imprint of another universe?
Written by Matt O’Dowd and Alexandra Yep
Hosted by Matt O'Dowd
Produced by Rusty Ward
Graphics by Kurt Ross
Made by Kornhaber Brown (www.kornhaberbrown.com)
Resources:
Local Voids as the Origin of Large Scale CMB Anomalies
arxiv.org/abs/...
Watching Worlds Collide
iopscience.iop....
Comments answer by Matt:
Fjellreven
• The Fate of the First ...
yeme
• The Fate of the First ...
myky992
• The Fate of the First ...
Andrew Wright
• The Fate of the First ...
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Опубликовано:

26 авг 2024

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Комментарии : 1,5 тыс.

@dcs_0 7 лет назад

Guys i found a really cool way to observe the doppler effect. Go into the street and look at cars. You will notice that the lights of the ones coming towards you look white, but the cars going away from you have lights that look red! Amazing!

@markmartinez4155 7 лет назад

Daniel Shapiro I dont know why but this has me tearing up with laughter. Im a simple man, easily pleased, that is most likely the case haha good stuff

@Hextator 7 лет назад

i was imagining a white light on top of a car able to be seen from both sides before i realized i was overcomplicating the joke

@242proPRODUCTUONS 7 лет назад

Daniel Shapiro it took me a minute but I got it, seriously I was like "huh I guess red shift happens on a small scale". I feel very stupid.

@dabeste6163 7 лет назад

Daniel Shapiro There's a better experiment. Red traffic lights actually appear green when you go fast enough due to the doppler effect. You only have to go rougly 50.000 km/s.

@it_was_my_cat 7 лет назад

I tried it, but then I got hit by a car.

@qixxxz 7 лет назад

When I microwave anything, there is ALWAYS a cold spot.

@matthewhicks7740 7 лет назад

qixxxz lol

@meusana3681 7 лет назад

that's because the microwaves in your microwave is basically as big as the box itself. thats why the round-top turns. Everything on the edges will get the full amplitude of the microwaves while the middle is sitting practically still. Ever wondered why microwave ovens are a certain size only. Look up resonance frequency of H2O

@meusana3681 7 лет назад

lifehack for countering cold spots. Put the plate on the side of the round-top.

@JLHunter61 7 лет назад

That is simply proof of micropenises or macrovoids or whatever they're calling it.

@calvinlin5207 7 лет назад

*cough* hotpockets

@ethanwagner6418 7 лет назад

Alien mother: Close that door! Are you trying to air condition the entire universe?

@thecommonfool2110 7 лет назад

yee

@michealroth120800 6 лет назад

Mhm.

@offcialmusicvotes7140 5 лет назад

Same.

@JockeyStrappers 7 лет назад

"you may notice this spot" yes i do notice many spots

@ahmedabbas4434 7 лет назад

YES EXACTLY, I wanted to mention that too.like is the problem only in the temperature regardless of the size of the spot. Because there is a huge "spot" near the middle bottom right.

@TheAnantaSesa 7 лет назад

He explains in the vid that that spot is much colder than the other spots. Relatively a lot in the micro kelvin range.

@kingdmind 5 лет назад

That’s why he specified “THIS spot” rather than “A spot”.

@EmeraldView 5 лет назад

@@kingdmind , has anyone yet found its G spot?

@larsulle3842 5 лет назад

@@EmeraldView isn't that just a myth?

@UpcycleElectronics 7 лет назад

3:49 Got me to do a double take after looking away from the screen for a sec. Those Integrated Sex Wolves are crazy.

@thehellyousay 5 лет назад

Yeah. For one thing, they whistle...

@aawagga7099 3 года назад

integrated sex, this sounds like both something a teen would laugh at and a class they would have it school that they hate

@someguy3766 5 лет назад

Physicist 1: "This region of spacetime I looked at is a bit colder than I expected." Physicist 2: "Probably a collision with another universe dude." You just gotta love physicists. xD

@JohnSmith-ox3gy 4 года назад

Some Guy Hmm... These orbits don't fit the calculations... Must be the planetX.

@sfarah7307 3 года назад

Yes yes yes

@Zeminix 2 года назад

*passes blunt* shhhiiieeet bro it just might be

@TuckerJohnson7 7 лет назад

5:50 "[complicated science words]. In laymans terms, [slightly less complicated science terms]". Anyway, awesome video as always!

@JK-ff8xf 7 лет назад

a time stamp i liked in this video was 3:50

@realityveil6151 7 лет назад

Space physics cracks me up. "Oooh, look at these plue pixels!" "IT'S A UNIVERSE!" "Whoa, Jim, calm down man. It's just some blue pixels." "MAYBE A SUPERVOID!" "WHAT EVEN IS THAT, JIM?!"

@MasterofFace 5 лет назад

Soooo true.

@MrMakae90 7 лет назад

"... but hey, at least we switched to Metric." - lol

@hussainattai4638 7 лет назад

Brings tears to my eyes

@aerozord 7 лет назад

There are two types of countries. Countries that use the metric system, and countries that have been to the moon

@hussainattai4638 7 лет назад

aerozord Jeez that was a good burn

@dannywalker3784 7 лет назад

aerozord england invented imperial but hasnt been to the moon

@jolez_4869 7 лет назад

There are also countries that use imperial and countries that have gone to space first, have done the first spacewalk, have sent the first animals to space and have first slept in the space.

@chrismorong931 7 лет назад

You correctly said 20 and 150 microKelvin, but the images said 20 and 150 milliKelvin.

@lukas_berger 7 лет назад

@maxpayne438 7 лет назад

Chris Morong maybe because the software they use doesnt have the "mu" char?

@nts3208 7 лет назад

Chris Morong Oh shit, time to delete the episode and redo the entire thing.

@damienw4958 7 лет назад

Chris Morong I was thinking that all the way through...

@lightningblender 7 лет назад

Just thought the same He constantly talks about μK but that's 10^-6 K not as shown 10^-3 K that's mK

@Vwcz 7 лет назад

"Think of 44 moons" 3:01 - Yeah that's really helpful

@SawtoothWaves 7 лет назад

What's your super power? Matt: I am less likely to sneeze after eating dark chocolate.

@uwuifyingransomware 3 года назад

Truly a superpower in 2020

@quantashonjamaldigglerbury4934 3 года назад

BRUH U HAVE 10 LIKES HOW ARE U AT THE TOP

@LargeInCharge77 2 года назад

@@quantashonjamaldigglerbury4934 likes dont matter

@mahikannakiham2477 6 лет назад

At 0:09 "You may notice a large blue splotch" *Proceeds to zoom in exactly in the opposite direction from where I was looking at*

@gnaeiuopl 3 года назад

Yeah, why does it look like there's a much bigger blue spot closer to the middle?

@sumreensultana1860 3 года назад

@@gnaeiuopl that's The largest voids

@ashley_brown6106 2 года назад

YES

@RaimarLunardi 7 лет назад

2:26 compression algorithm goes: fuck this shit!

@vampyricon7026 7 лет назад

I remember watching a video saying white noise is incompressible. I think it was Veristablium

@frankschneider6156 7 лет назад

+Vampyricon Assuming the "white noise" is truly "white noise" meaning it's totally random and completely free of any sort of information, then it is indeed incompressible.

@garethdean6382 7 лет назад

Of course what you need then is an algorithm that goes 'This is random, make up some new random noise as you go along.'

@only1kingz 7 лет назад

hahahaha

@blazex224 7 лет назад

+Vampyricon Fellow Hello Interneter, good day to you

@Nate-xl5pv 7 лет назад

This is my favourite channel on RU-vid. I don't always watch the videos right away but I'm always excited to find new ones because I know they will be good. Thanks guys for this free entertainment. It's always really interesting. Your presenter and presentation are awesome and IMO surprisingly close to perfect. I'm not religious but I think that the experience of watching your videos would be comparable with restoring my faith if I was. It's always nice to be reminded that there's more out there than we're immediately aware of. So I just wanna say thanks for this awesome content. You're amazing!

@kcwidman 7 лет назад

Astronomers and Astrophysicists are so freaking smart! The simple fact that it is possible to know any of this astounds me!

@brianweltmer 7 лет назад

Text in the video is displaying milliKelvin when Matt is correctly stating microKelvin. Great video as always

@djglxxii 7 лет назад

How can two different universes collide and merge when they each would potentially have a unique set of universal constants?

@garethdean6382 7 лет назад

In eternal inflation it's not a given that universal constants would vary between universes, since in essence you're merely merging bubbles in a single, much larger universe. If there WAS a difference the more stable spacetime would 'win', and start converting the other universe at light speed from the point of contact in a massive release of energy.

@hughbo123 7 лет назад

Gareth Dean How do you know that?

@garethdean6382 7 лет назад

Well the complete answer is that neither I, or anyone else does; the cold spot may be evidence for another universe but says nothing of the physics of that universe. (At present; closer observation would provide clues.) The simplest version of eternal inflation would simply involve making analogs of our universe; in the same way ever bubble that forms in boiling water is filled with identical steam the universes produced would be identical. Even in that case it may be possible for one merging universe to have a 'false vacuum' and be higher energy. It's a little more tricky to create universes with different physical constants since you then need each universe to be far more 'flexible' in how it transitions from inflation; not just a move from high to low energy but an alteration of how the fundamental forces work. If you DID have universes with differing physics that form from the same inflationary space then they should be 'compatible' in that you could turn the spacetime of one into that of the other via the high energy inflationary spacetime and possibly by lower energy means. In that case the lower energy universe should convert the higher. BUT it may be possible that it would take too much energy, resulting in a 'defect' where the two universes met, a 2D barrier between the two spacetimes. So there's a lot of 'best guess' involved at this point, based on theories we've developed with our single-universe observations.

@robertt9342 7 лет назад

Gareth Dean could the merging of the two universes with differing properties lead to some of the weird phenomena we observe in the quantum realm?

@helominousholo3537 6 лет назад

Heinz Getwellvet Its possible between 2 different universus just look at how things merge at a subatomic level not as complex as a universe

@abigailpena5950 6 лет назад

Does anyone else, after watching these videos, have this moment when the video is over and you just say out loud "damn..." Or "whoa..."? I keep on having that because it just blows my mind.

@InMaTeofDeath 7 лет назад

I think that's where the Reapers are hiding...

@Infinit3Enigma 7 лет назад

Assuming direct control

@2LegHumanist 7 лет назад

I'm going for a shit. The next comment from me will be typed while taking a shit.

@2LegHumanist 7 лет назад

InMaTeofDeath Here it comes I am shitting as I write this. I literally held it in long enough to find the comment and then let it rip.

@rudyardkipling7181 7 лет назад

That's grim

@2LegHumanist 7 лет назад

That was a good shit.

@fabianbecerra6936 7 лет назад

I wonder if you guys keep a list of all the 'future episodes' you keep promising, like that of the eternal inflation of 9:02. I really hope so because it always excites me when you say so.

@chrisX1722 7 лет назад

Is there also a relatively Hot Spot? #JustWondering

@thomastmc 7 лет назад

Seconded... Please do tell Matt.

@KCUFyoufordoxingme 7 лет назад

Yes. Just a much smaller varience.

@thomastmc 7 лет назад

+feh meh Well, that's just super boring 😉

@H20fulman 7 лет назад

My Mixtape is a relatively hot spot.

@thomastmc 7 лет назад

+Codie Tanguma Relative to what? The Oort Cloud 😜

@fergalfarrelly8545 7 лет назад

I love this guy and this show. it's so comforting to see a smart person on the screen wich is very rare.

@jaypennebaker9979 4 года назад

"At least we switched to metric", shots fired.

@kuunib7325 7 лет назад

Somebody just left the fridge open. Problem solved, now we can go back to videogames.

@AlexKnauth 7 лет назад

Big fridge.

@kuunib7325 7 лет назад

Alex Knauth Lot of beer

@MouseGoat 7 лет назад

well i have heard there was a galaxy sized cloud of alcohol in space somere

@AlexKnauth 7 лет назад

Bigger than that.

@spudhead169 7 лет назад

I once did this in my old apartment. It was a red hot day and no air con, so I opened the freezer door in an attempt to cool down the room, but it didn't work, if anything it got warmer. How's that then?

@jokwonpope1561 7 лет назад

I may not understand a lotof the videos but ill be damned if I don't watch them!

@Omicron91 2 года назад

3:00 is a good example of why we naming things "Quarks" is a good idea because if you keep reusing words like "degrees" it's a slippery slope to Gwyneth Paltrow talking about "energy" when she's getting a massage

@seanmcguire3906 7 лет назад

Really great episode! I love this, very well prepared and presented in an easy to understand way, but still keeps all the important information.

@thetruthfulchannel6348 6 лет назад

Fascinating! Are colliding bubbles a potential salvation from entropy?

@jero667 5 лет назад

This. It could support the "big bounce" theory.

@brokenacoustic 7 лет назад

Maybe its my ex girlfriend.

@wetpants70 7 лет назад

maybe it's your mum

@brokenacoustic 7 лет назад

Cant be, all my friends say shes hot lol

@georgeabreu6392 7 лет назад

acousticpsychosis It's simply too good. +1

@brokenacoustic 7 лет назад

I assure you, theres nothing good about your friends telling you how hot your mom is! lol

@georgeabreu6392 7 лет назад

acousticpsychosis I have a thermometer, it's fine.

@OctorokSushi 5 лет назад

*♫* _Now this is what it's like WHEN UNIVERSES COLLIIIIIIIIDE!_ *♫*

@fluffigverbimmelt 5 лет назад

Space Time 5000?

@FreeMindedMason 5 лет назад

The way I thought his intro was going... "Is that a giant cold spot in the cosmic microwave background... Or am I just happy to see you?"

@FarmingtonS9 7 лет назад

2:28 When you notice RU-vid's compression software....

@Egregius 5 лет назад

Oh wow, they must have used true noise for the background, and youtube then decided that if they couldn't compress it, they'll compress Matt!

@DadicekCz 4 года назад

Yeees 😂😂😂 Good point

@chaoaretasty 7 лет назад

So two questions on this. Firstly if the voids can create such a noticable effect on the CMB map is there work underway to more accurately measure these voids and calculate an ISW corrected map? Secondly, I would expect the statistical effects to be proportional not just to size but also to magnitude of such an area. The estimated chance of this area is 1/50 but if we correct for the ISW effect how much does this change the probabilities we are looking at? Obviously it's going to be an anomaly but a 1/20 would be a lot less "weird" than if it corrected to say 1/48.

@garethdean6382 7 лет назад

1.) There is an effort, but it involves measuring a lot of the universe and will take quite some time; you're literally trying to measure every galaxy out as far as we can see and there are a LOT of them. 2.) The corrected probability is indeed greater, depending on how you look at it, significantly so (Though not twice as great as 1/20 would assume.) Physicists prefer something that's more likely than not, the cutoff point is often arbitrarily set at 5% chance or lower.

@sammygthemanishere 5 лет назад

Matt, you rock! For the last few days i literally cannot stop watching these videos lol. You do such an incredible way of making very complex things understandable. I hope you guys never stop making videos!

@saturnblue Год назад

That's not Matt 😂

@MrChazz10 3 года назад

Right at the end "At least we switched to metric" 🤣🤣🤣

@Sam_on_YouTube 7 лет назад

You should do the recent paper claiming to provide a possible explanation of dark energy. They claim it is pressure from the quantum vacuum foam. In the past, calculations of this theory were off by so many orders of magnitude it was considered the least accurate prediction in history. But the new approach does a close examination of the impact of that kind of energy density and finds that the vast majority ends up being unobservable, leaving behind an effect that is of the right magnitude for dark energy. I have no idea if this is plausible, but I bet you can help with that.

@Samq666 5 лет назад

@holandreas 5 лет назад

Can you send me a link or the name of the article?

@NetUser-qm2ks 3 года назад

Shouldn’t some parts of the CMB be beyond our observable universe by now?

@tonysales3687 7 лет назад

i personally feel that the cold spot is a natural part of entropy - throw a big bag of garden peas over your kitchen floor and hey - there,s a small spot where no peas rolled to a stop. or , a cold spot.

@theodorevogiatzakis3911 7 лет назад

I swear this channel is pure gold.

@ruanvandendolder8394 7 лет назад

your supername: the lesslikelytosneezeaftereatingdarkchocolateman

@ruanvandendolder8394 7 лет назад

hmm i gotta work on a shorter name

@ABaumstumpf 7 лет назад

lltsaedcm

@vampyricon7026 7 лет назад

@frankschneider6156 7 лет назад

+Ruan Van Den Dolder what about: "Elvira" ?

@easypeasypiano6118 7 лет назад

Hershneeze

@tribiz6762 7 лет назад

When you say the cosmic microwave background has a temperature what exactly does that mean? Does that mean that the wave length of light coming out of the background corresponds to black body radiation with the same wavelength of an object with that temperature or is it something completely different.

@ABaumstumpf 7 лет назад

yes - that is exactly it. The CMB fits a theoretical black-body near perfectly, and from that we get the temp of ~ 3K.

@gubx42 7 лет назад

Yes. The CMB is the closest thing we have to a perfect black body of that temperature.

@carterhickenlooper8784 7 лет назад

Since the CMB is everywhere does that mean black body temperatures lower than it can never be measured without being drowned out?

@zxwy37 7 лет назад

Well, it's not everywhere. You could (theoretically) make a chamber that blocks out all of CMB radiation, and as long as the thing you are supposed to measure, as well as the measuring devices can fit within that chamber, the CMB wouldn't have any effect on the measurements.

@ABaumstumpf 7 лет назад

Carter - just cause it is everywhere does not mean it is strong enough to drown out other signals. Same as wherever you go there will always be the sound of you breathing - you can still hear anything that is louder just fine.

@fidrewe99 7 лет назад

I like like how you always end space time episodes with the same word.

@give_me_my_nick_back 3 года назад

Makes you think, a possibility of not having any rare properties at all should be much lower that having at least one rare property but there is a lot of room to play with giving tresholds etc.

@randysavage2585 7 лет назад

You kind of look like Bigby Wolf from Fables

@Galdo145 7 лет назад

In the event of two bubble universes colliding, is it possible (or likely) that one of them is a false vacuum relative to the other, causing the more false vacuum state to fall to the more true vacuum state starting at the point of collision?

@garethdean6382 7 лет назад

Yes, that's entirely possible. In this case the 'false universe' never sees the collision, only an expanding sphere of more stable spacetime erasing everything it touches. The other universe sees a hot spot dumping energy into it.

@N3bu14Gr4y 7 лет назад

Galdo145 The problem with that hypothesis is that if the universe started tunneling into a true vacuum from a singular point, we would never see it coming because the true vacuum would expand at the speed of light.

@jimwhitehead1532 6 лет назад

If you ever wanted a cool T-shirt it would read something like: "The only bearded Neanderthal left in space-time. I have a Black Hole to sell you."

@TimmacTR 7 лет назад

A cinnamon challenge for Matt is now therefore unavoidable.

@anonymousnearseattle2788 7 лет назад

If bubble universes can collide, then doesn't that imply that universes have edges?

@MasterofFace 5 лет назад

It implies a lot of contradictions, because it is wrong.

@memelordkuroeno2107 4 года назад

@@MasterofFace how do you know it's wrong? How do you know it's right either? No one knows dude just let those who believe in multiverses. Believe in it. And if you say "you sound like a flat earther" there's too much proof that the earth is round, and thus is a fact, we don't know if multiverses exist or not but there's theories out there.

@MasterofFace 4 года назад

@@memelordkuroeno2107 Believe in fantasy if you wish, but there is a pretty big hole in the idea. What is between the multiple "universes"? Either nothing, which is impossible, or something which would mean it is all connected together in a (one) universe.

@SplinterCell521 7 лет назад

dude, what if we collided with another universe, but it's matter doesn't interact with ours, and that's dark matter?

@garethdean6382 7 лет назад

Then, if it's responsible for the cold spot, dark matter should all be around that spot and not here, the colliding universe is merged with ours, but not completely mixed with it.

@gregoriikatastrov7472 4 года назад

....... ...... ............ whaaa?... -.-

@MaximumCrafter1 7 лет назад

I imagine this exploration would be a bit outside of your typical range of content, but I would be interested in spacetime's attempt to explain how quantum mechanics affects daily life, the role it plays in modern electronics, etc.

@ricisebastiano 7 лет назад

"Or in layman's terms..." and then he proceeds to make it even more complicated.

@viviunderhill2470 7 лет назад

ChocoSneeze 😎

@EmeraldEyesEsoteric 6 лет назад

I sneeze more when I eat milk chocolate then dark. Must be because my ancestors were white.

@PrincessEev 7 лет назад

Is the mixup between milli- and micro- as a prefix bugging anyone else? (ex. 0.15 K is 150 milliKelvin not microKelvin as stated)

@EebstertheGreat 7 лет назад

Microkelvin is correct in this case; the text on screen is wrong. There is a correction posted in the description.

@vampyricon7026 7 лет назад

@IrrelevantPlease 7 лет назад

PBS Spacetime has both the best videos on RU-vid, and the best comment sections. GG.

@robertnolan3559 4 года назад

This guy is awesome. CMB leads to microwave teleportation.

@simonthor7593 7 лет назад

"but hey, at least we changed to metric." Ooooooohhh get rekt America!!! (and Liberia and Myanmar)

@nostalgiafactor733 7 лет назад

Simon Thor I'm American and standard is so dumb. I wish we used metric

@fpvsushi8590 7 лет назад

@tnlaw2004 7 лет назад

Simon Thor metric is for casuals.

@oskarnone5288 7 лет назад

casuals like the scientific community?

@greenanubis 7 лет назад

+Naomi Saliba Exactly. Its just a whim, but people are sticking with it. I think it comes down to poor gratification delaying skills: metric is better and would pay off longterm but sticking with imperial lets people enjoy laziness and patriotism and economy avoid shorterm cost.

@calebstroup6917 7 лет назад

"Dark Matter" could just be another fundamental force of nature that isn't directly observable at our scale (the scale of human observation). If we were on the electromagnetic scale (i.e. atomic scale), gravity would seem to not exist due to our inability to directly observe it. All we could observe is electromagnetism and all theories that we had about observations of gravity on a large scale we would attempt to explain with strong force, weak force and electromagnetism.

@empanadasfritas7142 5 лет назад

This channel is only speculation.

@kindlin 4 года назад

@@empanadasfritas7142 This channel is far from only speculation. He covers in-depth all the evidence we have to support or refute any given topic. This is real data, actual evidence, the problem is that there are almost always multiple things that could explain any given piece of data. Only through finding enough varied pieces of data can we narrow down the possible number of acceptable theories to something manageable, and then make specific testable predictions to rule out the last few theories.

@nikanj 4 года назад

The latest Avenger. Regular-sized Tyrion Lannister with cave-man DNA and the ability to be statistically less likely to sneeze after consuming dark chocolate.

@iamamcnea 7 лет назад

I was just meeting with the professor yesterday. I think we are going with "Dark Sneezeless". Anyways, you should be hearing from the institute sometime in the next 1 to 2 weeks. Congratulations, look forward to seeing you around campus.

@RevCode 7 лет назад

I have a question about that "cold spot" on the cosmic microwave background map - what about the way bigger blue area just to the right and above of it?

@frankschneider6156 7 лет назад

spilled coffee (and actually it's rather black/brown than blue).

@gansan00 7 лет назад

I was curious, so I used a Google Cardboard and found a 360 VR video of the CMB image. It's really helpful in seeing it and you're right, at least just by looking, there are two clear big cold spots. I wonder why the higher up one isn't also worth investigating as a void.

@bygvgt3767 6 лет назад

Rev came here to ask this as well "um hay guys there's a way bigger one right above it..."

@M_Lars 6 лет назад

maybe the temp difference isn't as drastic as the lower one

@chaitanyapatel1946 3 года назад

Late to the party but I would comment anyway. Maybe the degree of coldness is also an important factor, not just the size. That cold spot is noticeably bigger (not the only big one) with unusually low temperature.

@vhsjpdfg 7 лет назад

What does it mean for two universes to collide? Does the multiverse theory redefine "universe" to mean a bounded post-inflationary pocket in a single "true" infinite universe?

@antred11 7 лет назад

That's exactly what I was getting at in a comment I made. It kind of bugs me that scientists are playing it fast and loose with terms with a well-defined meaning. Universe means EVERYTHING there is. There cannot, by definition, be anything outside the universe. If there is, then what we thought to be the universe really wasn't and is instead merely a part of the actual universe.

@Geoffronn 7 лет назад

So what do we call distinct components of a multiverse if not universes? Each is a universe because, under normal circumstances, no information can be exchanged between them. In this sense, the definition of 'universe' to mean 'everything' is outdated and misleading. A better, operational definition of 'universe' is that region of space with which we could have (in the past) or could (in the future) communicate with. And all such universes comprise the larger multiverse. So maybe universe doesn't mean a post-inflationary pocket since inflation could, in the future, bring two universes to collide and comprise a new universe.

@maryann2628 2 года назад

The universe could be infinite And the multiverse could be a bigger infinite What im saying its Infinite is all the number line And the bigger infinite is a line of smaller infiities It doesnt make sense.

@jurassicmatt2796 3 года назад

'Or in layman's terms' was my favourite bit. I know nobody who could keep up with this. Sadly.

@briancrane7634 7 лет назад

Ever since Perlmutter the Universe it not what it used to be. Excellent explanation! Thank You.

@EmeraldEyesEsoteric 6 лет назад

Well ya can't have a big bang unless two or more universes are gettin' it on! You say 1 in 50 Universes should have a cold spot. My question is, how many universes have you seen?

@dingdong475 6 лет назад

Its not really another universe. Its just a piece of our universe branched off. Thst just dosent have the same ooh factor

@theoreticalphysicsnerd0152 6 лет назад

It's a hypothesis..

@MirceaKitsune 7 лет назад

Since people made so many weird theories about this cold spot, allow me to write my own: What if it's the result of matter clumping within a higher physical dimension? Think of it like this: Suppose you take a basketball ball and cover it in a viscose liquid (such as honey), you will later see all of it piling down toward the bottom due to gravity drawing it there while a clean spot forms at the top. If our 3D space really is the surface of a 4D hypersphere, perhaps some +4D force causes matter to flow at one point on this sphere! Just a random idea that's fun to think about.

@matthewhicks7740 7 лет назад

MirceaKitsune so the cold spot would be the top of our universe and there should be a warmer denser area on the opposite side of the cmb. Yes it is fun to think about.

@snake3586 6 лет назад

I'm gonna go ahead and propose another idea. I'd like to imagine as the Big Bang, things did what they always do, they coalesce. Higher heat (on average) happened in most spots because it happened in the spots nearby. Imagine a balloon popping in slow motion, but in reverse. and instead of rubber, it's the heat of the expanding early universe.

@TouchTheUniverse 5 лет назад

Not sure it would be pretty to have 2 universes merge if they both have different laws of physics, but maybe this is like universes swapping chromosome, ensuring diversity.

@alexandraboyd8990 7 лет назад

this is amazing, I love gaining knowledge during summer break!

@moyenmishra887 7 лет назад

wabba labba dub dub

@tommeakin1732 7 лет назад

It's okay man, it gets better....

@it_was_my_cat 7 лет назад

Tom Meakin *wubba lubba D A B D A B*

@moyenmishra887 7 лет назад

CozmicK G halfway there..

@Boeing_hitsquad 7 лет назад

so... you're crying out for attention.. but not quite serious enough to warrant concern about committing suicide?

@backdownhipi 7 лет назад

Need that sauce Morty

@whoeveriam0iam14222 7 лет назад

astronomers also have issues with naming telescopes creatively.

@genericalfishtycoon3853 2 года назад

RU-vid AI for ads can be actually funny once in a blue moon. Got an ad for statefarm car insurance right after he said we might have collided with another universe. Lol

@jmanj3917 Год назад

8:44 I say it's the universe's equivalent of our belly button.

@PrinceOfKenya 7 лет назад

Wouldn't an ever-inflating space push any universes that formed ridiculously far apart from each other so they could never collide?

@oldbootz 7 лет назад

Space-time is created in our universe by inflation. I would assume that the definition of 'outside our universe' would also come with no space and no time, because that's strictly created inside our universe. So things couldnt be further or closer apart if there is no space. Things could no collide if there is no time...

@buufuu8990 7 лет назад

i see so many people with that stupid profile picture

@TheAnantaSesa 7 лет назад

+oldbootz, wouldn't the time outside our universe be 5d time in contrast to our 4d?

@N3bu14Gr4y 7 лет назад

I think it means the hypersurface of our manifold is expanding within extradimensional bulk space, which doesn't expand.

@helominousholo3537 6 лет назад

The Prince Of Kenya no because gravity dipz

@nts3208 7 лет назад

Haha, he said Sachs.

@JK-ff8xf 7 лет назад

3:50

@martinblake2278 7 лет назад

As expected, this is the best Science show in YT, total legit.

@robertschlesinger1342 7 месяцев назад

Excellent video. Very interesting, ,informative and worthwhile video .

@sourcedrop7624 7 лет назад

I SERIOUSLY don't get this. the cmb "spot" is a small nothing. there are huge blue spots in the middle and sides. what gives?

@daydrunk11 7 лет назад

I'm confused why we're talking about that one little blue space when there's a bunch of larger ones elsewhere? am I missing something?

@wearealreadydeadfam8214 6 лет назад

I was confused at first too. I think he said the larger areas aren’t that much cooler than the red areas. Where as the Cold Spot is much colder.

@koriko88 5 лет назад

The colors are not an accurate representation of temperature. It's the coldest temperature in the smallest area, on average.

@Shadowrunner340 7 лет назад

If it is indeed another universe colliding with ours, there are a few things to consider. 1. One of the multiverse hypotheses that predicts spatially disconnected and independent "bubbles" is true. 2. Why don't we actually "see" anything (galaxies and such) from the other universe, other than the imprint it's making? 3. If it's a case of some kind of surface tension, where it's just pushing on an edge and hasn't actually broken through, that would necessitate a physical barrier at the aforementioned edge. What's the nature of that barrier? Is it something that could be traversed? 4. Such a barrier may also indicate that there is a physical "outside" that the universe is "inside" of. 5. There is the question of why we're only seeing one universe nudging us from one direction. Why not multiple universes all around ours, like bubbles grouped together? 6. Further, that could indicate some medium that the universe(s) are moving around in. What's the nature of that medium? Is it a kind of spacetime in itself? Would it necessarily be higher dimensional? 7. Physically, it doesn't make sense that there would be only two universes comprising the totality of everything that is. Either there's only one universe (which this colliding universe theory would rule out), or there are a number of them, possibly an infinite number. 8. Would all these other universes have the same physical laws as ours? If not, would only the values change, or could there be universes that don't even have all of the physical laws that we do, and/or that have laws we don't? For example, this other universe over here might have a variable _c,_ or maybe no _c_ at all? 9. It's 1:30 am right now. I'm only going to get more and more outlandish if I keep going.

@yourstruely9896 4 года назад

I love it that they can fit the coldspot of the universe on my celphones screen.

@SahadatKhandaker 7 лет назад

thanks for this video so I can share it with dump people

@mcpitcher5191 7 лет назад

Well that defiantly doesn't sound arrogant or egocentric at all

@mcpitcher5191 7 лет назад

also if you are using this as a moral highground you should really be able to spell the word dumb

@noahgisolf6997 7 лет назад

I think he was talking about the people that live around dumping grounds

@HansPeter-qg2vc 7 лет назад

+MC Pitcher How do you know he doesn't talk about people who live in a dump? Maybe he wants to share this video with dump people because they don't have access to the internet?

@multicrogamer 7 лет назад

flatearthers?

@alexdeleeck7674 7 лет назад

🎉

@caioatila669 7 лет назад

Amazing video, thanks for this!!

@magne14527 7 лет назад

duuuuuude this episode was seriously amazing.

@alexanderduggan3365 7 лет назад

Early ohhhhhhhhh yeah

@Gnug215 7 лет назад

I sneeze after eating dark chocolate. Almost every single damn time. :)

@irri3191 5 лет назад

Your name should be The Dark Cocoa O'Dowd.The Prince of Northern Neanderthallia . Rightful heir to the throne of space time.

@alansnyder4104 7 лет назад

This multi-universe collision idea feels slightly like a "I'm not saying it's aliens... but it's aliens" explanation.

@codsniper31 7 лет назад

that feeling when you have an ad for the channel you are currently watching xD

@samrichardson5971 4 года назад

I really want a tattoo of the constellation Eridanus around this scar I have on my ribs to represent the supervoid! This is really interesting and my scar might have to represent a different structure altogether!

@pcuimac 7 лет назад

The ad was hillarious! lol

@partymetroid 5 лет назад

Those were some slick special effects! Good job, PBS Space Time team!

@davidwilkie9551 7 лет назад

One of the best answers to the questions that should be asked. Thanks

@maximumstromboli4024 6 лет назад

This channel by far has the best comments section

@flymypg 7 лет назад

I like that there's "always another explanation" for rare (unique) and/or unexpected observations. Even if that other explanation has the odds stacked against it, being "possible" is not it's only purpose: Alternatives also serve to provide us with new perspectives on the original observation, perhaps suggesting additional explanations that my yield better odds of being the correct one. Perspectives are important! Having a single perspective is like looking through a straw, or seeing with just one eye: You see only what you are aimed at, or a flat world. A second perspective is more like looking out a window to see the surrounding context, much like how seeing with a second eye (instead of just one) lets you perceive depth. The third perspective adds volume, but only if it is different enough from the other two. Beyond three they get harder to compare and contrast (combinatorial explosion = confusion and distraction). This is why I carefully listen to climate deniers: The odds are very much against their (often silly) positions being correct, but it makes me look at the climate data and arguments with a much more critical eye. Similarly, though I'm an atheist and skeptic, I always enjoy discussions (not debates or disputes) with people of faith. Now a leading argument for the Cold Spot has been weakened, making us look more critically not just at the overall statistics, but also at the alternative explanations. I think this is the best kind of fun a brain can have.