According to a recent YouGov poll, 35% of Americans think Pluto is not a planet. But they are all wrong—kind of. To get to ...

NASA’s New Horizons mission changed our understanding of the outer solar system. After its famous Pluto flyby, it traveled ...

If planets had social media accounts, the solar system would showcase a frenzy of unique personalities. Mercury tweets at ...

Filmmaker Adam Nemoy helps celebrate the 90th anniversary of Pluto's discovery this month at the 6th annual 'I Heart Pluto' ...

Burrowing under soil opens up a whole new world, especially when that soil is on other planets. Getting under the top layer ...

Welcome to this month’s edition of “What’s up in the sky?” February has a nice lineup of planets and some eye-catching ...

The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

The organic ingredients to life, hints to where Earth’s water came from, and the fundamental building blocks of our planet ...

If it’s real, some may question whether something with a mass about three times Pluto’s counts as a planet at all.

NASA Voyager 1 probe discovers Saturn’s moon, Epimetheus. Saturn would be the last planet Voyager 1 would visit before ...

Stargazers, prepare for the parade of planets that will take place over the next few nights in the sky. Here's what you need to know.

Scientists have discovered a new type of planetary collision called “kiss-and-capture,” where Pluto and proto-Charon briefly ...