Our universe is so big and we haven't explored even a millionth of a millionth of .......... part of it. We have not gone anywhere outside our own solar system. Yet some scientists, Einstien also, believe that there is more than one universe in which we can go by passing through a worm hole. Some even suggest that to every universe there must be a universe in which similar kind of things must be happening but the direction of time must be reverse, that is my anti- in the universe which will be corresponding to our universe will be born old and die as a child. Also about time travel it is written that if we travel around the event horizon of a black hole we will reach back in time but not in this universe but our corresponding universe.
Just watched a show yesterday on National Geographic. There a millions, and millions of other universes. Ours is the "Milky Way". But we will never know. It's impossible with our technology right now. If Earth is around in 300 years we might travel to some moons, and a few planets by then. But we will never know?
if you consider "universe" to be a word which is inherently all-encompassing, then no, there is only one universe. If you consider it to be something with particular confines, such as the laws of physics which governs any particular region of space, then maybe and maybe not, though this quality may be indefinitely immeasurable for humans.
So essentially, first you must decide on a definition for "universe", and then you must determine the feasibility of multiple forms of it being in existence.
If you figure it out, give me a thumbs up so I can smile about it.
Hello Bridget. Current quantum cosmology says yes, there are probably an infinite number of other universes (the Multiverse Theory). However, as they are outside this universe, there is no way that we (or anything in this universe) can ever see them, go there, or be affected by them ... it is all mathematical theory. For the same reason, we don't know if they are bigger than ours, 2 miles wide, or full of some liquid ... it is all theoretical. The usual analogy for their creation is, open a bottle of gassy drink - hundreds of bubbles appear, all different, and all separate from each other. At the "Big Bang", universes were made like that ... we are in one "bubble", which really is big enough!