"Charon is HUGE relative to Pluto, to the point where they are actually a binary," Denton explained. "It's half Pluto's size and 12% of its mass, which makes it much more similar to the Earth's moon ...

Both systems include a moon that is a large fraction of the size of the main body, unlike other moons in the solar system. The scenario also could support Pluto's active geology and possible ...

Find out about the solar system and learn the order of the planets with a song in this video ... and dwarf planets such as Pluto.