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actiomax said..
My understanding of the universe is because nothing can travel faster than the speed of light & because the universe is expanding faster
the farther away it is the distances involved really prohibits anybody coming here .
General relativity does allow for worm holes but the greater theory of relativity doesn't .
Hawking published a paper about that I just can't remember what it was called this morning so the best we could ever hope for is to detect radio waves . unless they go the slow boat method & spend a long time coming here or have a greater understanding & some new technology
True so far as we know it. But , in another universe ( and theres no reason there cant be , maths says there should be ) , there could be totally different laws of physics. We are probably not evolved enough to ever understand , its like trying to teach a dog poetry.