The idea of multiple universes is, like many other things, a theory. It could be true, it could not.
Multiverse ;)
Parallel Universes are a theory.
Certain cosmological theories such as the brane therory include many "universes" although properly, by definition, the Universe is everthing; so they might be called "multiverses"
ten
Nobody knows. There are ideas that there many be many universes such as ours. There is no evidence that there is anything else.
It is thought that there are other universes that look like ours. It is also been suggested that there are an infinite number of universes.
That is unknown. Some hypotheses based largely in mathematics have suggested that this is possible, but there is no direct eveidence that other universes exist.
Some cosmological theories predict the existence of not just one universe (our own) but many - possibly even infinitely many - universes (or multiverses). However, since they were all created in the Big Bang, these theories also predicts that no information can escape from those universes to ours. If that is true, then we cannot know.
The answer is simple: they don't. Indeed, as of now, there isn't any evidence that universes other than ours even exist, let alone whether they have life. At this point it's only speculation.
Meaning, as in, who discovered we were living in a series of universes? The universe was discovered by ancient Indians and Greeks, when theories of personal universes governed by physical laws were first introduced.
The idea of multiple universes is, like many other things, a theory. It could be true, it could not.
Well, there is a formula to figure out how many combinations of universes there would be that fit in the size of the observable universe. The formula is spacetimeatoms*elements and by working this out you would get 10 to the 225 power, factorial.
5
Multiverse ;)
no
Scientists admit that there may be as many as 27 'parallel universes' to our own. It is quite possible that there is not only an antimatter universe, but parallel universes to it.