If there was a contest for the most interesting moon in our solar system, Callisto would be a contender. Jupiter's ...

If there was a contest for the most interesting moon in our solar system, Callisto would be a contender. Jupiter's second-largest moon has more impact craters on its surface than any other ...

March's full moon, known as the Worm Moon, will bring a stunning total lunar eclipse, turning the Moon a deep reddish hue in ...

More pocked with craters than any other object in our solar system, Jupiter's outermost and second-biggest Galilean moon, Callisto, appears geologically unremarkable. In the 1990s, however ...

New evidence from an old NASA mission supports the theory that Jupiter's moon Callisto is in fact an ocean world. Credit: NASA / JPL / DLR A moon of Jupiter about the size of Mercury likely has a ...

Callisto is also thought to have liquid water, too. The small, rocky body is constantly being stretched and compressed by Jupiter’s huge gravitational force, keeping the moon ‘malleable ...

A stunning Blood Moon March 13/14 caps off plenty of planetary action and sparkling stars in the sky this week.

The dwarf planet 1 Ceres is in conjunction with the Sun at 5 P.M. EST today. While this means we can’t see Ceres for now, we can see Venus — which is at its brightest, reaching greatest ...

NASA's Europa Clipper is about to use Mars' gravitational pull to slingshot itself towards Jupiter's smallest moon later this ...

Callisto, Jupiter's second-largest moon, may have a rocky surface with an ocean beneath the surface.