This composite image of Pluto, right, and Charon, its largest moon, showcases photos captured by NASA’s New Horizons spacecraft in July 2015. Unlike how scientists believe Earth's moon formed billions ...

When NASA’s New Horizons spacecraft flew past Pluto in 2015, it revealed a world far more active and complex than scientists expected. Researchers later found evidence that a liquid ocean may exist ...

Pluto, once thought to be a frozen and lifeless world drifting on the edge of our solar system, may be harboring one of its most intriguing secrets: a vast underground ocean. A landmark study ...

Scientists have been blown away by Pluto’s complex geology in the months following NASA’s historic flyby of the dwarf planet. But it’s not the only interesting world in its system: Charon, Pluto’s ...

Yet Pluto has some geological oddities — in particular, a large number of cracks discovered on the far side — that add support to the existence of a hidden ocean, and even shed light on how it formed.

CAPE CANAVERAL, Fla. -- Evidence is mounting for an ocean at Pluto, buried beneath its frozen heart. Scientists said Wednesday that Pluto may have rolled over on its axis eons ago, the result of tidal ...

A researcher has used advanced models that indicate that the formation of Pluto and Charon may parallel that of the Earth-Moon system. Both systems include a moon that is a large fraction of the size ...