Astronomers Discover Planet Not In Any Solar System

First time they're sure

Eighty light-years from Earth, there's a world that's just six times more massive than Jupiter, floating all alone without a sun to keep it warm, astronomers reported Wednesday.

Such free-floaters have been reported before, but in the past, it hasn't always been clear whether these were orphaned planets or failed stars. This time, the scientists say they're sure it's a planet.