I think (just a guess) that a wormhole is essentially a place where gravity is basically infinite (or at least at black hole levels), and that's what's connecti

I think (just a guess) that a wormhole is essentially a place where gravity is basically infinite (or at least at black hole levels), and that's what's connecting the parts of spacetime. i.e. in order to warp spacetime enough, you need massive gravity. Or negative mass. So any object passing through would be squashed to nothing.