The possibility of there being parallel universes out there like our own is quite high if you think about it. At a fundamental level, the idea of infinite parallel universes is that every time a quantum interaction takes place all the various possible outcomes do happen somewhere out there, but with just one reflecting what happens in our own universe.
Quantum indeterminism is a term that is open for interpretation but a fundamental fact of the universe nonetheless. If you were to shoot a single electron through a double slit, you’d be wanting it to go through either one of the other. But, in the universe, the electron would instead pass through both slits at the same time and interfere with the dynamics of itself. When thousands of these electrons are shown in a row, an interference pattern will emerge.
There have been various theories created in trying to understand quantum determinism. One idea involves that of a wavefunction collapse, where an observation triggers the collapse of the wave function. Another involves a many-worlds approach, where the belief is that all possible outcomes do happen somewhere, but we can only see one. The multiverse idea sits at the opposite end of the scale and suggests that there are an infinite number of universes like our own and an infinite number of those that are different.
What we call the observable universe is around 46 billion light years in all directions but it’s quite likely it goes far beyond that – we just can’t see it. But, the odds are pretty high that somewhere out there is another universe where everything is happening the same, and also several others where the outcomes are different in every way possible. Whether we will ever be able to prove this, is another matter. I guess, for now; we can only imagine.
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