Almost 10 years ago, a NASA spacecraft was able to take several photos of Pluto, known for decades as a planet before it was ...

a moon that is half the size of Pluto, came to orbit the dwarf planet. Traditional theories involving debris or gravitational pull did not seem to fit the unusual size ratio between Pluto and Charon.

Pluto was once called the ninth planet, but in 2006, scientists changed its status to a dwarf planet. A planet must clear its orbit of other objects, but Pluto shares its space with many small icy ...

Pluto and Charon orbit a shared center of mass, much like figure skaters spinning together, a result of their unique collision process. The collision deposited internal heat into both bodies ...