Space is still the final frontier, and NASA has announced that the frontier is more vast than we realized. The NASA Kepler mission has discovered 715 planets set up in multiple-planet systems a lot ...

Kepler 452b appears to have many similarities to Earth, but is 1,400 light years away. Astronomers hunting for another Earth have found the closest match yet—a potentially rocky planet circling its ...

Scientists have long assumed that, like rocky planets such as Earth, sub-Neptunes begin with molten magma oceans. Their thick hydrogen-rich atmospheres were thought to trap heat efficiently, allowing ...