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 ...

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 ...

Jupiter officially reaches opposition at 4 A.M. EST, and its moon Callisto is helping us usher in the big moment with a transit — moving simultaneously with its shadow across the face of the gas giant ...

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 ...