They discovered a vast comet far out between the stars. Within its icy core were two beings, frozen in still life for thousands of years. One was human, a Prometheus figure. But the other, locked with the first in a tableau of eternal combat was Lucifer. Lucifer, Satan, the Devil--call him what you will--but there he seemed to be, horns, bat wings and all, the visible embodiment of all human legendry of all that was evil. Then they defrosted them. Prometheus was indeed the Fire-Bringer. The Other was the Old Enemy in person..with powers that baffled the advanced science of those future days.