The universe (if it were stable for all this time—and we have no reason to believe it is—and infinite in spatial dimension—and it very well could be) is old enough to have a 50% chance of the light of a living being entirely similar to us reaching us. This is a consequence of an intuition already present in Friedrich Nietzsche’s mind: nothing is unique, everyone possesses an unlimited number of copies, and anything with a probability greater than zero of happening must happen infinitely many times.
