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 ...

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 ...

The waning moon shines close to the king of the planets on Dec. 7. Don't miss Jupiter shining close to the waning gibbous ...

Witness the celestial spectacle of Jupiter shining brightly near the waning gibbous moon in the Gemini constellation on ...

Jupiter's four Galilean moons will line up in front of Jupiter in the early morning sky on Aug. 8. The predawn hours of Aug. 8 present a perfect opportunity to see Jupiter's four largest moons line up ...

Eight distant worlds hold secrets that still puzzle scientists and spark endless curiosity. Each moon offers a strange allure ...

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 ...