they are both things which we have no scientific  evidence for.why believe in one but not the other?

d21lewis said:
It would be like thinking that the only life in the ocean is the life living near the shore. And then not having the means to go further than a few feet.

We don't know. We can't prove there is life but we can't prove otherwise.

There are scientists and such trying to answer this question. I don't think VGChartz is going to give us definite proof.

Then again, it wouldn't surprise me if Highwaystar posts a link to a site with indisputable proof. He does that kind of stuff all the time.

I was under the impression that it is currently believed there is nothing outside of our universe.  That is space is expanding into literally non-existance.

That it would be impossible to expand into another universe simply due to the fact that everything around us is literally non-existance.

It seems far fetched as of yet to even suggest their are other universes as of yet.  Afterall there is no way to currently measure this.

Talk of other universes isn't scientific.  It's philosophical.

People talk of quantum mechanics being a reason there may be other universes... people also talk about quantum mechanics as being why people have "free will".  Or really quantum mechanics would make it "random will" more then free.

Quantum Mechanics are currently a catch all we don't know enough about and are used for every random theory someone has.

LOL

@Footballfan: I don't get it, are implying that I never do that or that I always do that?

@D21Lewis: I posted the Drake equation earlier and the Universe is certainly large enough to accommodate the Drake equation to the point of life forming (we will ignore the point from intelligent life onwards).

I know that it is nowhere near proof, but I think it does indicate that there is an extremely high chance that extra terrestrial life exists. Does it count?

In fact, Frank Drake himself predicted that there are possibly 10,000 extra terrestrial civilisations within the Milky way who we could communicate with (Source).

Always, well some times anyway

You are probably the most intelligent poster i know

Apart from me

Why is it believed there is nothing outside our universe?  If space has something to expand to, then there must be the possibility that there's something there.

Just like with what makes our planet unique, what made our big bang unique? 

You are correct that our Universe is expanding into non-existence as we would perceive it. But I also think that other Universes existing is a real possibility, one that has to be explored.

I think that the fact that our Universe exists is a pretty strong endorsement that others could exist. We cannot yet discount that whatever happened to create our Universe (Perhaps a quantum fluctuation, we don't really know) could easily happen again to create another Universe. Many physicists believe that other universes could exist, it's perfectly feasible.

Yes, you are correct in your main criticism that we have no way to measure it as of yet, we have only hypotheses. It is the one criticism I see most when the discussion of other Universes comes up.

Either way, those who claim we have no measurable evidence to back up the existence of other Universes suffer from their own argument. We also can't prove that we are the only Universe. It's something that has to be explored.

Personally, I think that other Universes could exist. What do I base that on? Not much I'm afraid (I know, not very scientific of me), mostly untestable hypotheses and the notion that we have been shown time and time again that we are always part of something larger when we have assumed we know the extent of the Universe.

Stephen Hawking put this quite elegantly once (in a documentary, it's not a particularly famous quote). I can't remember exactly what he said, so it wont be as elegant as he put it, but it was along the lines of...

"We were once convinced that we were the only world, the centre of the Universe; then Copernicus looked into the heavens and found that we are orbiting in a heliocentric solar system, we were not the only world and we were not the centre of the Universe.

We were once convinced that we were the only solar system, until we managed look even deeper into the heavens and find that stars are in fact the centre of other solar systems and that we were merely one among billions in a galaxy.

Even then we were convinced that our galaxy, the Milky way, was the universe; until we managed to look even further yet again and we discovered that our galaxy is only one amongst trillions.

Some are convinced that our Universe is the only Universe in existence. But one day we may have to accept that our Universe isn't even the only Universe in existence"

Also, this documentary is worth watching.

Link