Other theories that have been observed include
==The Multiverse Theory:hypothesis == ''See also:'' [[Multiverse hypothesis]]
This simply put is a theory that says we exist alongside an infinite number of other Universes all of which have different values to every thing, the size of protons are different, the force of gravity is different, etc. So a vast majority of the other Universes wouldn't be capable to support life and be able to have intelligent life as to be able to observe the Universe it lives in.
There are many criticisms as to why this theory can't be true, but one of the strongest arguments against this theory is that because this theory posits the idea of having infinite other universes, there would have to be an infinite amount of other universes that have intelligent life. Even life far more intelligent than us, that would be capable of traveling between Universes. We would then be subject to have an infinite number of inter-universal alien lifeforms that have figured out how to travel between different universes and could invade us, destroy us, or having an infinite amount of any sort of device sent to our Universe and completely filling our finite space and inevitably destroying our Universe.
==Cosmological Natural Selection: ==