The solar system lost its ninth planet back when Pluto was demoted to a dwarf planet, but research might indicate that there ...

Pluto, once thought to be a frozen and lifeless world drifting on the edge of our solar system, may be harboring one of its ...

Though Pluto has formally been considered a dwarf planet for almost two decades, it still has many lessons left for planetary scientists — including hints about how the solar system formed.

A new trans-Neptunian object, 2017 OF201, has been found with a vast orbit and potential dwarf planet size. The finding hints ...

On Feb. 11, 1999, Pluto moved back outside Neptune’s orbit, once again becoming the furthest planet in the Solar System. Far out!

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

On July 14, 2015, NASA's New Horizons spacecraft arrived at Pluto for the first time. The craft flew within 7,700 miles of the planet and is sending back reams of data and the highest resolution ...

Pluto's largest moon, Charon. (Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute) Labroots recently explored Saturn’s sponge-like moon, Hyperion, with its ...