we don’t actually think about aliens.

but if you want a list of hypothetical alternate origins, and don’t have access to the wealth of programming generated by Prometheus and made available on Discovery Networks, thanks to some of the minds of our time, this light summary might help…

* center of the earth is actually hollow, “aliens” are just inner earthlings * one of the other planets or otherwise within the solar system isn’t so dead after all * it’s just us - from the future * it’s just us - from the past * no space travel, no time travel, but parallel earths or dimensions or something * they have always been here, we just are too dumb to see them