Pluto has long been one of the most debated celestial bodies in our solar system. Once classified as the ninth planet, it was ...

Two of Pluto's midsize moons may be made of the guts of its largest moon, Charon, new research suggests.

NASA's New Horizons spacecraft has beamed back the first color image of Pluto and its largest moon, Charon.

The first color movies from NASA’s New Horizons mission show Pluto and its largest moon, Charon, and the complex orbital dance of the two bodies, known as a double planet. “It’s exciting to ...

New Horizons scientists use enhanced color images to detect differences in the composition and texture of Pluto’s surface. When close-up images are combined with color data from the Ralph ...

The astronomers at Lowell Observatory in Arizona are showing Pluto some love on the 95th anniversary of its discovery, regardless of whether we call it a planet or not.

Pluto may have lost its status as a planet more than 13 years ago, but don't tell that to NASA Administrator Jim Bridenstine.

It confirmed the tiny planet harbored an ocean beneath its thick, icy shell. When did Pluto stop being a planet, and why? Pluto was always in a tough spot when it came to being a planet.