Experts postulated a new theory about the largest moon of the dwarf planet Pluto. The planet had five moons among which Charon was the largest and had a diameter of about 754 miles, just over half ...

The ringed gas giant Saturn has officially replaced Jupiter as the planet in our solar system with the most moons. The International Astronomical Union officially recognized 128 new moons orbiting ...

Here are the five most surprising things discovered ... deep canyon at the edge of the Solar System. But on Charon, Pluto's nearest moon, they found this most familiar of geological features.