'Do all aliens really need sunlight?' ...

Astronomers have spent decades hunting for life where it seemed to make sense: on Earth-like planets orbiting Sun-like stars at just the right distance. But a new study from a team of European ...

Add Yahoo as a preferred source to see more of our stories on Google. An artist's impression of a habitable exomoon. (NASA GSFC/Jay Friedlander and Britt Griswold) Planets drifting unmoored through ...

Billions of stars in our Milky Way galaxy have captured rogue alien planets that once cruised freely through interstellar space, a new study suggests. Many wandering alien worlds, which were ejected ...