Do parallel universes exist? execute we live in simply one of countless bubble universes? (Image credit: note GARLICK/SCIENCE photo LIBRARY via Getty Images)
Parallel universes are no longer simply a attribute of a good sci-fi story. Over there are currently some clinical theories that support the idea of parallel universes beyond our own. However, the multiverse theory remains among the many controversial theories in science.

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Our world is unimaginably big. Numerous billions, if no trillions, that galaxies spin with lasignoralaura.com, each containing billions or trillions that stars. Some researchers studying models the the universe speculate the the universe"s diameter might be 7 exchange rate light-years across. Rather think it might be infinite.

But is it every that"s the end there? science fiction loves the idea the a parallel universe, and also the thought that we could be living simply one of an infinite variety of possible lives. Multiverses aren"t booked for "Star Trek," "Spiderman" and also "Doctor Who," though. Actual scientific concept explores, and in some instances supports, the instance for universes outside, parallel to, or far-off from however mirroring ours own.

Multiverses and also parallel worlds are often suggested in the context of other major scientific concepts like the huge Bang, cable theory and quantum mechanics.

Related: How large is the universe?

Eternal inflation, the large Bang theory and also parallel universes

Around 13.7 billion year ago, every little thing we recognize of to be an infinitesimal singularity. Then, according to the huge Bang theory, the burst into action, inflating much faster than the rate of light in all directions for a tiny fraction of a second. Prior to 10^-32 seconds had actually passed, the universe had exploded outward to 10^26 times its initial size in a process called cosmic inflation. And that"s all before the actual growth of matter that we commonly think of together the big Bang itself, which to be a an effect of every this inflation: as the inflation slowed, a flood of matter and also radiation appeared, producing the classic huge Bang fireball, and also began to form the atoms, molecules, stars and galaxies the populate the vastness of lasignoralaura.com that surrounds us.

Related: How one inflating universe could create a multiverse

That mysterious process of inflation and also the big Bang have persuaded some researcher that lot of universes lasignoralaura.com possible, or even an extremely likely. Follow to theoretical physicist Alexander Vilenkin of Tufts university in Massachusetts, inflation didn"t end everywhere in ~ the very same time. If it ended for whatever that we have the right to detect from planet 13.8 billion years ago, cosmic inflation in fact continues in various other places. This is called the theory of eternal inflation. And also as inflation end in a specific place, a new bubble world forms, Vilenkin wrote for scientific American in 2011.

Those bubble universes can"t call each other because they continue to broaden indefinitely. If we were to collection off for the edge of our bubble, wherein it could butt up against the following bubble world over, we"d never ever reach it due to the fact that the leaf is zipping away from us faster than the speed of light, and faster 보다 we might ever travel.

Related: How plenty of stars room in the universe?

But also if we can reach the following bubble, follow to eternal inflation (combined v string theory), our familiar universe with its physical constants and habitable conditions could be completely different indigenous the theoretical bubble universe alongside our own.

"This photo of the universe, or multiverse, together it is called, defines the long-standing an enig of why the constants of nature show up to be fine-tuned for the development of life," Vilenkin wrote. "The factor is the intelligent observers exist just in those rarely bubbles in which, through pure chance, the constants occur to be simply right because that life come evolve. The rest of the multiverse remains barren, yet no one is over there to complain about that."

Vilenkin"s explanation means that in few of the limitless bubble universes outside our own, there could be various other intelligent observers. However in every immediate that passes, we gain farther far from them, and we will never intersect.

Quantum mechanics and parallel universes

Some researcher base their ideas of parallel universes ~ above quantum mechanics, the mathematical description of subatomic particles. In quantum mechanics, multiple claims of existence for small particles are all possible at the same time — a "wave function" encapsulates all of those possibilities. However, when we actually look, us only ever observe one of the possibilities. Follow to the Copenhagen interpretation of quantum mechanics as defined by the Stanford Encyclopedia of Philosophy, us observe result when the wave role "collapses" into a single reality.

But the many-worlds concept proposes instead that every time one state, or outcome, is observed, over there is one more "world" in which a various quantum outcome i do not care reality. This is a branching arrangement, in which immediate by instant, our perceived universe branches right into near-infinite alternatives. Those alternate universes are completely separate and unable to intersect, for this reason while there may be uncountable version of you life a life that"s contempt — or insanity — different from her life in this world, you"d never know it.

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The many-worlds theory is the many "courageous" take on the quandary of quantum mechanics, physicist Sean Carroll composed in his book, "Something deep Hidden: Quantum Worlds and also the appearance of lasignoralaura.comtime" (Dutton, 2019). He likewise argued that it is the many straightforward theory, although no without wrinkles.

One that those wrinkles is the the many-worlds idea is no really falsifiable. This is vital component of scientific thought and is the means the scientific neighborhood develops principles that deserve to be explored v observation and also experimentation. If there"s no possibility to uncover evidence against a theory, that"s poor for scientific research as a whole, scientific research journalist man Horgan argued in a blog write-up for scientific American.

Infinite lasignoralaura.com, unlimited universes?

The Milky Way, pictured below as viewed from Earth, is simply one of numerous billions, possibly trillions, that galaxies in the universe. Each galaxy is comprised of billions or trillions of stars, every of which can have planets. Could any type of of them be just like ours? (Image credit: Weerakarn Satitniramai via Getty Images)

Some physicists believe in a flatter variation of multiple universes. That is, if the cosmos that we live in goes on forever, there are only so numerous ways that the structure blocks the matter have the right to arrange themselves as they assemble throughout infinite lasignoralaura.com. Eventually, any type of finite variety of particle species must repeat a particular arrangement. Hypothetically, in a big enough lasignoralaura.com, those particles must repeat species as big as entire solar systems and galaxies.

So, your entire life could be repeated in other places in the universe, down to what you ate for breakfast yesterday. At least, that"s the theory.

But if the universe began at a finite point, as almost every physicist agrees that it did, an alternating version that you most likely doesn"t exist, according to astrophysicist Ethan Siegel"s 2015 medium article.

According to Siegel, "the number of possible outcomes from corpuscle in any type of Universe communicating with one one more tends in the direction of infinity faster than the number of possible Universes increases as result of inflation."

"So what does this average for you?" Siegel wrote. "It means it"s up to you to do this world count."

The mirror-image universe

Some researchers imply that ~ above the opposite side of the large Bang timeline, stretching backwards in time, a universe once existed that was the specific mirror image of our own.Here is an artist illustration the the background of the cosmos as gift by the WMAP (Wilkinson Microwave Anisotropy Probe) which invested nine years developing full-sky maps that cosmic microwave background. WMAP learned the light released about 375,000 year after the huge Bang, before stars and also galaxies formed. (Image credit: NASA / WMAP scientific research Team)

In a reasonably recent enhancement to the pantheon that multiverse theories, researchers from the Perimeter Institute because that Theoretical Physics in Waterloo, Ontario, have actually proposed that the universe started at the big Bang — and on the opposite side of the big Bang timeline, extending backwards in time, a universe as soon as existed the was the precise mirror photo of our own.

"Instead of saying there was a various universe prior to the bang, we"re saying that the universe before the bang is actually, in part sense, photo of the cosmos after the bang," Neil Turok, a Perimeter institute researcher, called lasignoralaura.com sister site Live Science.

That method everything — protons, electrons, also actions prefer cracking one egg — would certainly be reversed. Antiprotons and also positively fee electrons would comprise atoms, when eggs would un-crack and make their way back inside chickens. Eventually, that world would shrink down, presumably to a singularity, prior to expanding out right into our own universe.

Seen an additional way, both universes were created at the huge Bang and also exploded all at once backward and forward in time.

Multiverse: arguments for and versus

Arguments because that the multiverse theory

Cosmic inflation

Our world grew significantly in the first moments of its existence, however was this expansion uniform? If not, it suggests different areas of room grew at different rates — and also may it is in isolated indigenous one another.

Mathematical constants

How are the regulations of the world so exact? part propose the this taken place only by chance — we room the one cosmos out of many that happened to get the number right.

The observable universe

What is beyond the sheet of the observable an are around us? no one knows because that sure, and also until we perform (which can be never), the assumed that ou world extends unlimited is an interesting one.

Arguments against the multiverse theory


There is no means for united state to ever test theories of the multiverse. Us will never ever see past the observable universe, so if over there is no method to disprove the theories, have to they even be provided credence?

Occam"s razor

Sometimes, the simplest concepts are the best. Part physicists argue that we don"t require the multiverse theory at all. It doesn"t solve any type of paradoxes, and only creates complications.

No evidence

Not only deserve to we no disprove any kind of multiverse theory, us can"t prove lock either. We currently have no proof that multiverses exists, and also everything we can see suggests there is just one cosmos — our own.

Parallel universes in fiction

The protagonist the Marvel"s physician Strange (2016) has actually the strength to run into various dimensions. (Image credit: Marvel.com)

Countless works of myth and fiction draw from ideas of parallel universes and also the multiverse. Overlapping people make appearances in norse mythology and also Buddhist and also Hindu cosmology. The idea of many universes comes into call showed increase in print as beforehand as Edwin A. Abbott"s novella "Flatland: A romantic of countless Dimensions" (Seeley & Co., 1884), and also can tho be viewed in current movies such together the 2016 Marvel movie "Doctor Strange." an entire genre of Japanese graphic novels, dubbed isekai, transaction with characters transported to parallel worlds, as described by the new York windy Library.

Nearly every "Star Trek" collection incorporates some form of mirror universe, and also the 2009 reboot film starring kris Pine and Zachary Quinto took succeeding "Star Trek" movies right into an entirely brand-new timeline that clearly branches turn off from the initial series.

And comics, as well as their matching movies, cave deeply into the idea that parallel worlds. Current Marvel Comics" storylines (both film and in print), DC"s Flashpoint arc and also 2018"s "Into the Spider-Verse" all explore multiple universes and also the intersections in between them.

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This is one incomplete perform of part appearances that multiverses, split-timeline universes and also parallel universes in fiction:


Into the Spider-Verse (2018)Terminator Genisys (2015)Phineas and also Ferb the Movie: throughout the second Dimension (2011)Star Trek (2009)Donnie Darko (2001)Run Lola run (1998)Sliding Doors (1998)Back to the Future 1-3 (1985, 1989, 1990)The Adventures that Buckaroo Banzai throughout the 8th dimension (1984)


Star Trek: Discovery, lot of episodesStar Trek: Enterprise, many episodesStar Trek: Deep an are Nine, many episodesStar Trek: The following Generation, "Parallels" (Episode 11, Season 7) (1993)Star Trek: The original Series, "Mirror, Mirror", (Episode 4, Season 2) (1967)Doctor Who, multiple episodes Sliders, entire seriesCommunity, "Remedial Chaos Theory" (Episode 4, Season 3) (2011)Rick and Morty, multiple episodesFuturama, lot of episodesEureka, many episodesAgents that Shield, lot of episodes


"The Chronicles the Narnia" series (Geoffrey Bles, 1950-56) by C. S. Lewis"His Dark Materials" series (Scholastic, 1995-2000) through Phillip PullmanThe "Discworld" series (HarperCollins, 1983-2015) by terrycloth Pratchett"Men favor Gods" (Macmillan, 1923) by H. G. Wells"The Dark Tower" series (Donald M. Grant, 1982-2012) through Stephen King

Video games

BioShock Infinite, 2013Kingdom Hearts, 2002-2020Chrono Cross, 1999Half-Life, 1998-2020Metroid element 2: Echoes, 2004Zero Escape, 2009-2016

This write-up was adjusted in part from previous work by lasignoralaura.com contributor Elizabeth Howell.

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