Could other Galaxys be what we consider to be alternate realitys?

Considering that other Galaxy's are theoretically unreachable from our own due their sheer distance away, our nearest one Andromeda being 2 million light years away, and since faster than light travel is, once again, theoretically impossible due to the time travel factor that this would create. Could it be possible the other Galaxy's are in fact alternative reality's as we know it? Our galaxy, the Milky Way, has over 100 Billion stars, most with their own planetary systems and Andromeda has a similar amount as we believe. If this were possible would it not give rise to thought that the big bang may not have stopped after creation but our understanding of it may be wrong as it is in fact still churning out an infinite amount of Galaxy's that are constantly moving away, hence we don't know this due to our distance from it?