What are the different theories about parallel universes?

Answer 1

There are 4 main theories about parallel uni/multiverses(yes, that is the correct term).

Type 1. There are parallel Earths elsewhere in this universe- there could be an infinite number of parallel Earths, or any random number, each one with different outcomes of everything, changing whether you have green hair, or brown hair, or no hair at all. this is all to do with the butterfly effect, which is when one thing changes huge things, like war, or politics.

Type 2. In this theory, there is a thing called hyper space, which is what contains multiverses. In hyper space, there is nothing, and that means absolutely nothing at all, but other theories say that hyper space is riddled with dark matter, which is invisible- at least to our eyes. These multiverses are in universal bubbles, which float around in hyper space, and could eventually collide with each other. This means that we might be able to find a way to transport to or at least make contact with these other multiverses. As in the first theory, the different multiverses have different outcomes.

Type 3. This is the hardest theory to get your head around. First, each multiverse is flat. O.K? Now, each multiverse is connected by invisible strands of matter to 'membranes' the same size as the multiverses. These 'membranes are pulsating like waves, and keep the multiverses going. These multiverses and membranes look like this:

l-I l-I l-I l-I

l-I l-I l-I l-I

l-I l-I l-I l-I

l-I l-I l-I l-I

l-I l-I l-I l-I

In this diagram, l is a multiverse, - is an invisible strand of matter, and I is a pulsating membrane.

And, finally, type 4. There are no parallel uni/multiverses, and we are alone. But this is boring, so ignore it.

Hope I helped : )