Io’s long-debated magma ocean may not exist. Juno spacecraft data reveals that tidal forces deform the moon differently than ...

The gas giants outside our solar system are not capable of hosting extraterrestrial life, but do offer clues in a lingering ...

The flowing water likely wraps around a solid rocky core. If true, that would make Callisto a close sibling to Europa, another moon of Jupiter ... 150 miles beneath the surface.

"Scientifically there's a huge amount we can learn from asteroids," says Alan Fitzsimmons, an astronomer at Queens University ...

increasing the movement of particles and a higher likelihood of interesting things happening under the surface. Callisto, the outermost of Jupiter’s 95 moons, first caught NASA’s attention ...

Jupiter and Saturn are believed to have first formed from a "bottom up" process in which a bunch of tiny, icy particles came together into a solid core ... peroxide on the surface of Charon ...

My apologies for the delay here. This is a week of lengthier interviews as we prepare for the season preview special section ...

In the 1990s, however, NASA's Galileo spacecraft captured magnetic measurements near Callisto that suggested that its ice shell surface—much like that of Europa, another moon of Jupiter—may ...