Even the most intelligent of us on the planet would give themselves a headache trying to work that one out. To me space seems endless, and cannot end.
But because it's so vast, maybe somewhere there are identical worlds like ours, with intelligent beings. But although I'm not a churchgoer, I have to admit that there must be a power, (God) if you like, that made this possible.
Scientists are now talking about bending space like a folded paper, so that the two ends meet, thereby shortening space travelling time.
But I have trouble with this theory, because, if you were to try this by cupping your hands in a bath of water and pull the water up in each hand to meet, there's not a void left, because the rest of the water fills the emptiness right away. So why should space be different??? However,there are things I believe, that we are simply not meant to know.
Hackenabush
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Your point is well taken, but it must have been cold before it got hot in the first place. How it heated up is the mystery, although planets colliding can generate heat. The thing is, there are so many universes with large stars in each of them, that the mind boggles with the awesome power of it all. God must have a mindblowing collection of batteries up there.
But you can bet that in five or six hundred years the scientists will discover stuff that would probably send us all into the mad house if we were to know it now.