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 ...

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, NASA's ...

In a landmark observation by a team of international researchers, NASA's Juno spacecraft has, for the first time, clearly detected the auroras of Jupiter's moon Callisto. This discovery completes the ...

Joe is a freelance journalist. It all started with a long-running affection for building his own PCs, which he did for the first time as a teenager. It evolved into a lifelong enjoyment of putting ...

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 ...

The Galilean moon Callisto disappears behind Jupiter in an occultation early this morning. The catch is that the event is only visible from the western half of the U.S., but observers farther east can ...

Tonight, all the action is over at Jupiter. The giant planet rises in Gemini around 8:30 P.M. local time; as soon as it’s visible above the horizon, East Coast observers will notice two dark shadows ...

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

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 ...