Pluto's 'Hulk-Like' Moon Charon Is Bursting with a Frozen Ocean

A frozen subsurface ocean may have caused Pluto's largest moon, Charon, to begin bursting at the seams, much like Marvel's green superhero the Hulk. A newly released image of Charon from NASA's New Horizons spacecraft suggests that some of the fractures on that moon's surface may be the result of a once-liquid ocean beneath the surface freezing over time. The largest of Pluto's five moons, Charon is about 750 miles (1,200 kilometers) in diameter, about half as wide as Pluto.