The True Science of Parallel Universes

By | August 15, 2019


Everyone loves the idea of parallel universes
– maybe it’s the appeal of an ideal world where you have second chances and things turn
out differently – an alternate reality where you do get into Hogwarts and the Star Wars
prequels aren’t made and you finally plug in your asymmetric computer cord correctly
on the first try… but is there really a place in science for such wistful speculation? I mean, if “the universe” is everything that
there is, you can’t have two versions of it, right? Otherwise the pair would really be
everything and what you started off calling the universe, wasn’t. The problem here is terminology: physicists
speaking informally often say “universe” when they really mean “observable universe” – that
is, the part of the whole universe that we’ve so far been able to see. And it’s perfectly
fine to talk about multiple different observable universes – for example, an alien near the
edge of OUR observable universe will see parts of the Whole Universe that we cannot yet see,
but that’s a well-understood question and not what physicists normally talk about when
they discuss multiple observable universes, or “multi-verses.” So let’s cut to the chase: in physics, the
word “Multiverse” normally refers to one of three distinct and largely unrelated proposed
physical models for the universe – none of which has been tested or confirmed by experiment,
by the way. The three “multiverse” models are: Type 1) Bubble universes or baby black hole
universes. This is the most straightforward kind of multiverse: the basic idea is that
perhaps there are other parts of the universe which are so far away that we will never see
them (or are inside black holes so similarly we will never see them).
This kind of model was created as an attempt to explain why our universe is so good at
making stars and galaxies and black holes and life – as the argument goes, if each of
these separate mutually un-seeable “bubbles” in the universe had slightly different laws
of physics, then by definition we could only exist in one that had the right physical laws
to allow us to exist. If you’re not convinced by this logic, don’t worry too much: there’s
not yet any experimental evidence for this kind of multiverse.
Multiverse type 2) Membranes and extra dimensions. Inspired in part by the inability of the mathematics
of string theory to predict the right number of dimensions for the universe in which we
live, string theorists proposed the idea that perhaps what we think of as our universe is
actually just a three-dimensional surface embedded within a larger super-universe with
9 spatial dimensions. Kind of like how each page of a newspaper is its own two-dimensional
surface embedded within our three-dimensional world.
And of course, if space had 9 dimensions rather than three, there’d be plenty of space for
other three-dimensional surfaces that appeared, like ours, to be universes in their own right,
but, like the pages of a newspaper, were actually part of a bigger whole. These kinds of surfaces
are called “membranes” or “branes” for short. And as a reminder, there is not yet any experimental
evidence for this kind of multiverse. Multiverse type 3) The many-worlds picture
of quantum mechanics. Surprisingly, physicists still don’t fully understand how the collapse
of the wavefunction in quantum mechanics happens, and the many-worlds hypothesis makes an attempt
at explanation by proposing that every possible alternate timeline for the universe is real
and they all happen in an ever-larger, ever-branching way. Like, a universal choose-your-own-adventure
where every possible story happens! If this were the case, we might not realize
it because we’d be stuck living out just one of the infinitely many possible lives available
to us. In some ways, many-worlds is similar to the bubble multiverse model by proposing
“maybe anything that can happen, does. And we just happen to exist in the series of happenings
that were necessary for us to exist.” If you’re still not convinced by this logic, don’t worry:
there is not yet any experimental evidence for this kind of multiverse. Of course if you want to get imaginative,
you could also combine several of these models together into a multi-multiverse… a new
super-speculative model based, itself, on speculative and experimentally unconfirmed
models. But that’s not to say we couldn’t test these
multiverse hypotheses. For example, if our observable universe were really just one of
many disconnected bubbles or membranes and if it happened to collide with another bubble
or membrane some time in the past, then that collision would certainly have had some sort
of effect on what we see when we look up at the night sky.
On the other hand, the many-worlds interpretation might be tested fairly soon since experimentalists
are becoming increasingly able to manipulate and control ever-larger quantum mechanical
systems in their labs – systems that approach the line between the quantum realm and our
everyday experience. So as always, we must remember that physics
is science, not philosophy; and in our attempts to explain the universe that we observe, we
have to make claims that can in principle be tested – and then test them!

81 thoughts on “The True Science of Parallel Universes

  1. BeatSmith Laden Post author

    I don't believe this because it doesn't make much sense. if two universes are born from one universe that means they have exactly the same past. I believe the future and present are shaped by what happened in the past. if the two universes have exactly the same past 100%, that means the two universes will forever be the same unless if disturbed by an external force (a force from outside the universe). so the multiverse theory that says one universe… option A happens and in another universe… option B happens doesn't make much sense to me. they both have the same past. so if one universe goes with option A the other universe should also go with that same exact option because there's no reason for them to be different unless there's an external force. the multiverse theory I I like to imagine is the one that says they've been multiple universes since the beginning of this universe or before the universe. or the big bounce theory

    Reply
  2. Pizza_Tony Post author

    In another universe you disagreed with this theory

    Reply
  3. 2donnyblack2 Post author

    All this shit doesnt work without a spiritual component… .. . spiritual NOT religious… .. .

    Reply
  4. Tripp550 Post author

    What is the difference between a parallel universe, parallel dimension, and a parallel reality? Especially a parallel reality, what the heck is that about?

    Reply
  5. Aryaman AK Post author

    I believe in the marvel Comic's perception of the multiverse and MCU's perception of time travel.

    Reply
  6. Cindy Weaver Post author

    My own dreams convinced me of this. Thanks for the explanation 🙏💜🕉

    Reply
  7. RUDY MANN Post author

    So in another universe Optimus prime would still be protecting earth 😃😃

    Reply
  8. Firdeus Naci Post author

    If this is true it means my parents love someone else in another universe, not me😟😥

    Reply
  9. 1101010110111111010001101110 doe Post author

    Probability is simply a science that attempts to predict possible outcomes. That doesn't mean possible events will occur, there is just too many variables to make an absolutly accurate statistic. Any moment is the culmination of every cause an effect event with a very specific preset result. Parralel universes as a whole is just the result of fantastical speculation on rather unknown parts of our reality that we will probably never know existed.

    Reply
  10. omnom409 Fressmichvoll Post author

    Maybe they are not reachable at all

    Reply
  11. Digaddog Post author

    What if in the 9D theory there was some sort of hook that they had which let them travel through the multiverse and that's why ghosts and vampire and ancient gods are a thing

    Reply
  12. Vince Caglianone Post author

    Doesn't the many worlds interpretation defy the laws of conservation of energy? If every decision branch created both universes, then where did that energy come from to create the extra universe? And, since there have been quantum state collapses since the beginning of time, if each produced both possible conditions, wouldn't the amount of energy needed to create a new bubble universe for each quantum state collapse require energy that approaches infinite? The simplest answer is the collapse is a juncture that only produces a single outcome, not spawns an complete alternate bubble universe. It's also the one which changes energy state, neither creating nor destroying energy.

    Reply
  13. Jack McLaughlin Post author

    So theres a universe where i fell off the rolar coaster?

    Reply
  14. JustAnAsianWithYT Plays Post author

    If it was a parallel universe we wouldn't be there right?

    Reply
  15. Wynaut Videos Post author

    AND TO ANSWER THAT, WE NEED TO TALK ABOUT PARALLEL UNIVERSES

    Reply
  16. Lugh4Life Post author

    In a parallel universe the person we lookup to the most is us.And who knows, maybe this time they lookup to us!?

    Reply
  17. Awesome R Post author

    an a press is an a press, you can't say it's a half

    i hope no one used this

    Reply
  18. PurpleGlitterKitten Post author

    In a parallel universe, I graduated college at 2 years old. Thank you, thank you.

    Reply
  19. Karim Post author

    If you want to get a different idea about the whole parallel universes thing make sure to watch My friend has been living in an alternate reality for 7 years

    Reply
  20. Loser. DerpyDuck Post author

    I have a thunk for the bubble theory. A 2D object cannot stand up in a 3D world. A 1D object cannot stand up in a 2D world. So we cannot stand up in a 4D world?

    Reply
  21. گی عادی شده به کار رفته و با Post author

    In an other universe tik tok doesnt exist. I want to be there

    Reply
  22. Some Otaku Post author

    "But first, we need to talk about parallel universes."

    Reply
  23. Sanjog Nepal Post author

    Meanwhile in parallel universe, I am sleeping instead watching this at 3 o'clock in the morning

    Reply
  24. Teddy craft & Entertainment Post author

    You are dead in other universe.

    Reply
  25. Flower flower Post author

    So when I see a person I didn't see him before and I feel I know him may be I know him in parallel universe !

    Reply
  26. ya boi Chester Post author

    What the fuck did you just say about the prequels

    Reply
  27. Brent Ralph Bautista Post author

    So there's gotta be a parallel universe where My Chemical Romance hasn't broke up.

    Reply
  28. Nicolas Garland Post author

    Actually, for the brane-world model, it is possible that gravitation is able to interact through (all or some of) the other dimensions, which should lead to detectable gravitationnal effetcs that we could not attribut to any visible matter (since electromagnetic force is confined in our three dimensions). And … we actually measured those evidence for brane-world model (and call it "dark matter").

    Reply
  29. Trexpelia Helvetios Post author

    GODDAMMIT VALENTINE

    In the alternate universe, jesus told the president to kill that fucking asshole crippled and his mozarella friend

    Reply
  30. Morgan McClain Post author

    Me: watching this video
    Dr. Strange: I'll stop you right there

    Reply
  31. The Three Stooges /M.A.G Post author

    I think when things move randomly like chairs and stuff it happens for a reason it could be a psychic outside of this universe or god trying to save us from something bad happening to us

    Reply
  32. Malcolm chin Post author

    So parallel universe is about "what if"?

    Reply
  33. Juan Sampaio Post author

    I like to think there are universes based on fictional we made here, because there is an infinite amount of universes possible.
    So perhaps the Avengers do exist but we just can't interact

    Reply
  34. Cringe Gaming 64 Post author

    But first, we need to talk about parallel universes

    Reply
  35. Ago Contealia Post author

    If The Universe expands, And The Magnetic poles Shift, You stand at One Point and as the world Turns and evolves around the Sun, and the Universe Expands, You would Be at Another point in space and Time, if You was Frozen in that spot.

    Reply
  36. Ago Contealia Post author

    Oh Dead Ion Now Right, Well what do you see, but a Monkie, and The New Elon musk Company.

    Reply
  37. Ago Contealia Post author

    I'll call the Komodo Dragon, If You Dy Tell Them They Are Welcome To Be Gay, All day, Cause it's the Happy happy joy joy Song, Monkie

    Reply
  38. Emma Weber Post author

    Watching this after reading Dark Matter. That novel blew my mind.

    Reply
  39. Jennifer Capuyan Post author

    The Parallel Universe was snapped by Thanos

    Reply
  40. Tom A human Post author

    If the many worlds theory is true, then there is a
    World that it isnt….

    Reply
  41. Susanna Briones Post author

    Now im sad i live now and not at a time scientists have figured this out… If they ever Will tho

    Reply
  42. Zachary Joshua Jao Post author

    So, is it possible that a man made story become a whole new universe?

    Reply
  43. BR Post author

    The repetitive "there is no experimental evidence" is so stupid. That's why it's called theoretical physics!

    Reply
  44. Your 1839 Post author

    I call the multi-multiverse or how I see it the 9th dimension the The dimultiverse, or bimultiverse.

    Reply
  45. Yibo Duan Post author

    so Mario how did u came back after defeating darkhon

    Reply
  46. helloworld Post author

    So is there any experimental evidence for this Kind of multiverse?

    Reply
  47. Bruce Lectro Post author

    The second multiverse makes the most sense imo.

    Reply
  48. Rafe Hayden-Lee Post author

    also. There are energy forces between all atoms in the universe, this is sending exact movements to other atoms. if we place groups of…well… trillions upon billions of atoms together with other groups we could create parallel universes. but in order for thins to happen we would have to copy our world and send the signals through the energy 'wires'. not only that, but we would have to find a way to dissolve humans to 'mail' them to the other world. this is were shroedingers cat comes in. a cat that is put in a box with different death (and poisons) mechanisms. usually the cat would die… in the right universe the cat would survive. but the only way to find out if the cat is dead is to open the box… if the box is not open the cat can be either alive or dead, we can't know. parallel universes… real, but fake. we won't know until we find out…

    no cats were harmed in the proses of this comment

    Reply
  49. AJGamer Post author

    Man im just sad wanna quit this shit i want to be in a universe where i dont have to deal with this stupid stuff

    Reply
  50. Maxis320 Post author

    If there are infinite parallel universes, what makes our universe, any special different or meaningful? It’s just another Version that could be vastly different or similar to other parallel universes. We live our lives out like they matter and we have choice but if parallel universes exist our stories are destined and we have no control over what we do, it’s a timeline destined to happen in our universe. We aren’t special

    Reply
  51. Osumazi meowisfromme Post author

    That means there could be an universe (or infinity slightly different universes) where you still could turn on TV and watch the good old Cartoons and Animes like YuGiOh, DB(Z) , Detective Conan, Digimon, Pokemon (1st gen), Sailor Moon, Beyblade etc. That must be a generation of lucky guys followed by another generation of lucky guys

    Reply
  52. Bob Thelob Post author

    If there’s a parallel universe then there’s a parallel universe where you are dying slowly while eating tree bark

    Reply
  53. The toadette/jirachi expert Whittaker Post author

    So if there is infinite parallel universes

    Then there is a world where everyone is flat earth believers.

    Reply
  54. Artistic Rishu Post author

    Will there be a universe where ironman is still alive ?

    Reply
  55. christian benedick Post author

    Im watching rese while watching steven universe

    Reply
  56. Mukul Shukla Post author

    I watch your video same time I don't watch your video in other universe it's 😂😂😂lol

    Reply
  57. Waw Majikk Post author

    in another universe, pewdiepie Focused on his school and never did youtube

    Reply
  58. Sc4ry Dude Post author

    I have check every universe, in every universe I don't have money

    Reply
  59. The Anonymous Painter Post author

    Im afraid that a single drop of ballpen will make me not graduate in highschool

    Reply
  60. Daddy took the vacuum back downstairs Post author

    I didnt write this comment in an alternate universe

    Reply
  61. Axeque. Post author

    i feel like parallel dimensions are all around us, just interwoven into reality so that we cant actually see nor interact with them. we'd need to shift our dimensional perspective somehow to access it, which would look incredibly cool. sort of like an acid trip.

    Reply
  62. Wanda Maximoff Post author

    It's so crazy how in another universe, I could be the opposite gender or have blue eyes or my pet that died is alive

    Reply

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