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 ...

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 ...

The gas giant Jupiter still dominates the constellation Taurus as it sets in the west after sunset. Jupiter now stands just to the right of Alheka (Zeta Tauri), one of the tips of the Bull’s two horns ...

What exists beneath the surface of Jupiter's icy moon, Callisto? This is what a recent study accepted by The Planetary Science Journal hopes to address as a team of researchers investigated the ...

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 ...

Jupiter hosts the brightest and most spectacular auroras in the solar system. Near its poles, these shimmering lights offer a glimpse into how the planet interacts with the solar wind and moons swept ...

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 ...