Callisto, Jupiter's second-largest moon, may have a rocky surface with an ocean beneath the surface. If there was a contest for the most interesting moon in our solar system, Callisto would be a ...

Jupiter reaches opposition, making it brighter and larger than at any other time this year. A rare transit of its moon Callisto adds to the event, visible with binoculars or a small telescope.

There’s no mistaking Jupiter in the sky these Pottsville winter evenings, rising in the southeast as evening twilight ends.

What exists beneath the surface of Jupiter's icy moon, Callisto? This is what a recent study accepted by The Planetary ...

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 ...

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 ...

Sky This Week is brought to you in part by Celestron. Friday, January 9Mars is in conjunction with the Sun at 7 A.M. EST, ...

On January 7, 1610, the Italian astronomer Galileo discovered three of Jupiter's moons: Callisto, Europa and Io. When he looked at Jupiter through his telescope, he saw what he thought were three tiny ...

The wolf moon is spectacular enough, but look east and you’ll see a celestial titan the size of a pinprick ...

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 ...