A recently discovered "super Earth" located around 25 light-years from our planet is not as massive as previously thought, ...

The size of a planet is a major factor that determines if life can gain a foothold on it, even if it's in the habitable zone of its star.

If you were hoping we’d find alien life hanging out on a cozy, pint-sized planet anytime soon, then you should know that ...

For a world to maintain an atmosphere long enough for life to gain a foothold, it seems it needs to be at least as big as Mars.

NASA plans to launch the Habitable Worlds Observatory in the 2040s, a mission whose goal is “to image Earth-like planets around other sun-like stars,” according to NASA’s website.