Hm...

Speaking of...what is a proof that something out of this atmosphere exists?

I don't think that there isn't space, but the more I think of it, I can't think of a reason to prove or otherwise.

The light and heat of the sun? The gravitational effects of the moon on the tides? The fact that as high as we go while still in the atmosphere we still don't touch the moon or sun?

Actually, isn't there some kind of mathematical way of showing how far something away is by measuring is simultaneously from two different points?