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

Add Yahoo as a preferred source to see more of our stories on Google. This rogue planet likely formed within a traditional planetary system before gravitational interactions—perhaps with a massive ...

Moons orbiting rogue planets, worlds flung from their parent star systems into the cold of interstellar space, could maintain liquid water on their surfaces for billions of years if wrapped in a dense ...

A mysterious "rogue planet" has been observed gobbling 6 billion tons of gas and dust a second — an unprecedented rate that blurs the line between planets and stars, astronomers said Thursday. Unlike ...

Astronomers have detected a massive, lonely world drifting through the darkness without a star to call home. This Saturn-sized rogue planet was discovered by an international team of scientists using ...