Astronomers noticed something curious about the center of a galaxy 600 million light-years away. A central blast of radiation, a quasar, seemed to have an engine of bumper-sized proportions. Not one, but two black holes circling each other.
The theory of panspermia is a controversial one. It has various forms, but the crux is this: Life originated beyond the Solar System and was spread through the galaxy, perhaps via drifting microbes, asteroids or even artificially by intelligent beings.