I think, there is more than just one. and having a planet like earth? I guess it's also possible. maybe there even is a planet somewhere that has inhabitants just like us.

I personally believe when it comes tot hings like planets, space, and the universe i believe we might not ever know how many there are exactly. I believe there are many more we haven't even studied and know about. I believe there are some we wont ever find and be able to study so its one of those things that if its discovered cool but if not that's cool too

If you're using the bible, then I'd say one. If you take religion out, then you'd never know

Ok, Universe means complete infinite universe. There is only one universe which is filled with galaxies and stars and planets, moons etc.
Only one universe.

Exactly what 1dogzilla said :\

The 'Multiverse theory' is actually gaining ground within the scientific community. However, this is not alternate realities like people have been talking about here, is it entirely different universes within different physical laws. One idea is that different universes are formed from black holes, creating universes in other dimensions; this also implies that our universe may have been created in a black hole of another universe.

... My mind has just melted. For the 3rd time, my mind has melted, but not because of how bad something is, this time it's about how CONFUSING a thing can be! IMO, there may be other universes, but it gives me a headache just to think about it.

I was reading something not so long ago that adds credibility to the multi-verse theory. Scientists who study anti-matter found a particle that is half matter and half anti-matter all at once. This particle was studied for only a couple seconds, as it can only exist in our universe for a couple seconds. Doesn't that mean that it exists somewhere outside our universe and we're just pulling it in to study it for a couple seconds?

Keep it coming.
No religious theories please.

The questions you have asked are not yet full discovered by humankind. Be patient and only time will answer your questions

No one knows, and this also depends on if there is a multverse or not, which is the existence of our universe as well as other ones.

both yes and no depending on your definition of universe, it an ambiguous term. ive had alien visits in planet k'pax in the constellation lira, and they traveled in multitudes of c

U believe there is only one, but there is no way to prove if there is more or not.

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