Rocky worlds larger than Earth are commonplace in the galaxy, and a few of them may even be habitable. Which poses an interesting question: How difficult would it be for aliens living on these ...

Aliens living on distant planets may be trapped there by gravity, according to new research. Scientists looked into how difficult it would be to launch a rocket from a super-Earth - huge worlds up to ...

A multi-media simulation of a “super-Earth” astronomers found more than 20 light years away. MARTIN BERNETTI/AFP/Getty Images Of those 53 planets and counting, about 30 are known as ...

Gravity has its dark side, as anyone who has fallen down a flight of stairs is painfully aware. But if you think gravity is annoying here on Earth, be grateful you don't live on a more massive planet, ...