The reason Pluto's relationship with Charon has been challenging to scientists is because of the relatively small difference ...

In contrast, Pluto's moon Charon has an estimated diameter of 744 miles (1,200 km). But the object could be smaller if it reflects more light than anticipated. One alternative measurement places ...

An curved arrow pointing right. NASA's New Horizons spacecraft took us to Pluto for the first time in July 2015. Scientists are astonished by the incredible features they've observed on the dwarf ...

This story appears in the July 2015 issue of National Geographic magazine. Small, cold, and absurdly far away, Pluto has always been selfish with its secrets. Since its discovery in 1930, the ...

An curved arrow pointing right. See what's so weird about Pluto and its moons. Produced by Emmanuel Ocbazghi. Original reporting by Jessica Orwig. Follow BI Video: On Facebook More from Science ...

Pluto is a mystery to scientists. Speculation abounds as to whether it is a planet in its own right, part a double planet with its companion Charon, a large asteroid or a burnt-out comet.

By measuring the size of the shadows ... was a six-mile deep canyon at the edge of the Solar System. But on Charon, Pluto's nearest moon, they found this most familiar of geological features.

Pluto and Charon formed from a “kiss and capture” collision, a new study from the University of Arizona reveals, rewriting theories of planetary formation. Unlike catastrophic impacts ...