Out of all the moons circling Jupiter, one stands out as the most realistic place for humans to build a base. It is called ...

Long posited as a potential human outpost in science fiction, Jupiter’s icy moon of Callisto largely remains a mystery to real life planetary scientists. As one of the least studied of Jupiter and ...

A recent analysis finds up to 1,000 times more molecular oxygen than can be explained by prevailing theories about where it comes from. Jupiter’s four largest moons are some of the solar system’s most ...

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 planetary ...

The highest-resolution images of Callisto have revealed a moon far more complex than scientists assumed. Beneath its ancient scars lie patterns that don’t match typical impact structures, hinting at ...

Seven years from now, in April 2031, ESA's Juice mission will fly past Jupiter's moon Callisto, offering scientists a tantalizing glimpse at the mysterious, cratered alien world. That might seem far ...

Add Yahoo as a preferred source to see more of our stories on Google. Callisto, Jupiter's second-largest moon, may have a rocky surface with an ocean beneath the surface. If there was a contest for ...