What is Parallel Universe ?

as the idea of parallel universes. Going back to the idea that space-time is flat, the number of possible particle configurations in multiple universes would be limited to 10^10^122 distinct possibilities, to be exact.

with an infinite number of cosmic patches, the particle arrangements within them must repeat — infinitely many times over. This means there are infinitely many "parallel universes"

cosmic patches exactly the same as ours (containing someone exactly like you), as well as patches that differ by just one particle's position, patches that differ by two particles' positions, and so on down to patches that are totally different from ours.

Not everyone agrees with the parallel universe theory, however. A 2015 article on Medium by astrophysicist Ethan Siegal agreed that space-time could go on forever in theory, but said that there are some limitations with that idea.

The key problem is the universe is just under 14 billion years old. So our universe's age itself is obviously not infinite, but a finite amount. This would (simply put) limit the number of possibilities for particles to rearrange themselves, and sadly make it less possible that your alternate self did get on that plane after all to see China.

the expansion at the beginning of the universe took place exponentially because there was so much "energy inherent to space itself," he said. But over time, that inflation obviously slowed — those particles of matter created at the Big Bang are not continuing to expand

his conclusions: that means that multiverses would have different rates of inflation and different times (longer or shorter) for inflation. This decreases the possibilities of universes similar to our own.

"Flatland: A Romance of Many Dimensions" (1884), by Edwin A. Abbott, is a story about a two-dimensional world that includes living geometric figures such as circles, triangles and squares. The novel also includes other universes such as Lineland, Spaceland and Pointland. This book was adapted into a feature film in 2007.

"The Chronicles of Narnia" (1950-56), a C.S. Lewis book series, features several children who move between our world and the world of Narnia, where there are talking animals. Some of these books were released as feature films earlier in the 2000s.

An episode of "Star Trek" featured a "mirror universe" in which the characters were more ruthless and warlike. The concept was repeated in nearly every subsequent "Star Trek" series. In 2009, the "Star Trek" universe got a reboot in a movie that put the characters from the 1960s original series in an alternate universe.

In "The Dark Tower," a Stephen King series that began in 1982, travellers go through portals to different levels of the titular tower (in other words, parallel Earths). Part of the series was adapted into a feature film in 2017.

The "Back to the Future" movie series (which began in 1985) follows the adventures of the McFly family, including visits to 1885, 1955 and 2015. The second film in particular shows the drawbacks of an alternate reality, when one character uses it to get rich by nefarious means. The series starred Michael J. Fox.

In the "His Dark Materials" series by Philip Pullman, children move between multiple worlds. The first book, "The Golden Compass," was adapted into a film in in 2007.

"Run Lola Run" (1998) is a film starring Franka Potente. The film shows multiple alternatives as a woman tries to get 100,000 Deutsche marks in only 20 minutes to save her boyfriend's life.

"Sliding Doors" (1998) is a film that showed two parallel universes depending on whether the main character caught a train or not. It starred Gwyneth Paltrow and John Hannah.

"Timeline" (1999) by Michael Crichton follows historians who go back in time to the Middle Ages. (While the book is mostly a time travel book, the multiverse is used in it as well.) A film based on the book was released in 2003.

"Donnie Darko" (2001) is a film in which a high school student finds himself confronted with visions and tries to figure out their meaning. It starred Jake Gyllenhaal.

"The Long Earth" book series, by Terry Pratchett and Stephen Baxter, discusses parallel universes that may be nearly the same as Earth.

"Stranger Things" (2016 to present) is a science fiction-horror television series that begins with the investigation of a young boy's disappearance in a small town. The series includes discussion of an alternate dimension called the Upside Down.

More and more scientists are convinced our world is surrounded by a number of parallel worlds that are invisible to the naked eye. Although, no-one has so far been able to prove that our Universe is only one of many, there are a number of clues that suggest parallel universe do exist.

evidence of parallel universes is very challenging. Scientists have hoped that the Large Hadron Collider (LHC) might reveal evidence of their existence, but so far definitive proof has not been discovered with the LHC.

Physicists have studied gravitational waves, ripples in space-time caused by the motion of massive objects and now they suggest these waves might allow for a single, coherent theory of the universe. Basically, this means that signs of extra dimensions may reveal themselves in the way they impact gravitational waves.

The idea that black holes could be gateways to parallel universe has been a popular science fiction topic for long, but it is scientifically possible?

According to Stephen Hawking, renowned theoretical physicist and cosmologist mysterious, destructive, dark parts of the universe could answer one of the most puzzling paradoxes of physics – the existence of parallel universes.

Stephen Hawking has argued in favor of the parallel universe theory for many years. It has previously been assumed that anything that falls into a black hole would be destroyed and lost forever, but Hawking is of a different opinion.