What is a parallel universe in fiction or reality? It is basically a science fiction theory that entails the presence of multiple universes. The Parallel Universe theory finds its base in Big Bang Theory. The reason of its relation with Big Bang theory is the definition of universe creation as a result of a collision or blast of non-terrestrial bodies packed together in a place smaller than an atom. Yes, you read it right, the big bang defines the universe as something that came into existence as a result of blast that expanded a body smaller than atom. So, what is a parallel universe?
It is unknown, how and what caused everything to come as much closer to one another. But it was all compressed to a smaller place as per scientists. And the Big Bang theory is endorsed by a wider section of scientist around the globe. It is unknown what caused the blast we know as Big bang, and it is also unknown where from that energy came to compress and finally decompress such a closely packed body. But, in science a hypothesis becomes a theory if there comes no one to oppose it.
For now, it is about the existence of parallel universe. The parallel universes are imaginary universe or multiple universes also known as multiverse, so to say. And this comes from the possibility of multiple big bangs taking place all over the different places in an infinitely large universe. The infinitely large universe comes from the inflation theory that tells that the universe is inflating or expanding at an enormous pace. This theory is also termed as cosmological inflation of universe.
Why Parallel Universe Exists?
It tells that the universe came out of a body compressed in an areas smaller than an atom. Than due to unknown factors it blasted and resulted into the formation of observable universe. Additionally, the resulting universe keeps inflating all the time. Moreover, it states that there could be many such small compressed elements present in places unknown to humans or in space. How vast is space or universe? No one knows and also there are no means available.
The idea of universe resulting from a blast is due to the scattered appearance of planets, moons, meteoroids, asteroids, and other bodies that are wavering or wandering in the space. Have a look at the blast in the gif below and ride on the horse of imagination. The central part represents an atom and the blast resulted into things scattering that were previously compressed as per Big Bang theory. The only difference in the explosion below and in the universe is that the particles in the image below are settling due to the pull of gravity. Whereas, the case of space is different due to an absence of gravity.
How there could be many other such smaller than atom bodies in far unknown places? The answer to this complex yet interesting question is the outcomes of a quantum physics experimentation. In a double slit experiment when an atom is shooed, its path could be guessed without any surety and its place of final appearance could not be predicted. And thus you are left to deal with the possibilities. A part of this might be some natural phenomenon that we can’t yet predict or know.
How it tells what is a Parallel Universe?
Anyways, the closely packed substance that was supposed to be smaller than the atom could be many in various places of the vast universe. And thus there could be many universes that could be identical to our universe. There arises another question, how many universe are there? It is a debatable question and the discussion goes interesting. It will be uploaded soon.
There is a possibility of those universes being different to our universe but that too must have calculated or predictable changes. Parallel universe and multiverse also contain a concept that arises from the discussion of alternate realities.
Opposition to Parallel Universe Theory
There is a criticism on Parallel universe theory in educated sections of society. And that arises from the very base of the existence of universe and the big bang theory. The big bang theory is famously known as the foundational block of scientific explanation of existence of life. However, it is unknown if it explains the true existence of the observable universe.
Therefore, the parallel universe theory which is basically an off shoot of big bang theory compromises it credibility. And thus it remains unknown if there exist many or how many parallel universes in the space and beyond.