Can there be many universes?

Question

At some point, I came to wonder if there could be more than one universe, just like there are numerous galaxies. I know that the universe in which we live is expanding in eternity. However, beyond the extending border, can't there be many other universes as well? Does this make sense or totally SF-like concept? Help please. Thanks.

Answer 1

  There is only one and this is it.

Answer 2

Not only possible, it's even likely.

The scientific theory is that the Universe started as a fluctuation of the vacuum. Such vacuum fluctuations make appear a small amount of energy, for a small time. This phenomenon is responsible for the existence of forces, that hold the Universe and matter together.

Normally the bigger the energy fluctuation, the smaller the time it is in existence.

Not so the Big Bang. That was a HUGE fluctuation. So big that a lot of energy came to appearance in the form of mass, elementary particles. These particles started expanding, before the vacuum could reclaim the energy.

And it is still expanding today. 14 billion years later.

Now for some speculation. Is our Universe the only one? Maybe not. The Big Bang was one big fluctuation, maybe other smaller or bigger, take place all the time.

But most of these fluctuations will produce Universes in which conditions are just not suitable for life.

The Universe we observe is by necessity one in which the conditions are just right for us to have evolved into Homo Sapiens capable of asking philosophical questions.

Answer 3

I don't see why not, there is just too much we don't know about out there, maybe we will never know.

Answer 4

Very possible. But we do not have the answer because we haven't been that far so it currently cannot be answered.