Early results on the fourth planet from the TRAPPIST-1 star suggest it lost its original atmosphere to space long ago, and it ...

Are eight planets enough? While Mars and Saturn dominate the evening sky, Venus and Jupiter pass near each other late in the month.

A quick guide to planets, including the eight in our solar system, how they form, and how many could be in the universe.

In a new study, researchers at the University of Chicago have discovered in simulations that a small body under half the size of the Earth would be able to cool a moon's subsurface ocean for more than ...

Learn facts about the planets and remember which order they go in with these interactive learning resources for Primary Science students from Horrible Science and BBC Bitesize.

Using data from NASA’s retired InSight lander, two separate teams of researchers found evidence of a sluggish Martian mantle ...

Did Pluto ever actually stop being a planet? Experts debate. It’s been 18 years since Pluto’s celestial status was called into question—yet the matter seems far from settled. We asked ...