Because Io is so close to its massive host planet, the moon is subjected to a tremendous gravitational pull as it orbits Jupiter once about every 42 hours, according to the Planetary Society.

Jupiter isn’t alone in this category; Saturn, Uranus, and Neptune are also gas giants, though Uranus and Neptune are often ...

What's more, a massive volcanic hot spot on the moon's southern hemisphere that Juno observed during its third-ever flyby of the moon on Dec. 27, 2024, appears to still be active, according to NASA.

Recent flybys of the fiery world refute a leading theory of its inner structure—and reveal how little is understood about geologically active moons.

Jupiter's second-largest moon has more impact craters on its surface than any other planetary body in the solar system, and it has tons of ice on its surface as well.

"Eight minutes later, the orbiter started receiving data from the descent probe, which slammed into the top of the Jovian atmosphere at a comet-like speed of 170,000 kilometers per hour," NASA ...

Observations from NASA’s Juno spacecraft reveal that Jupiter’s strong magnetic field and the unique properties of its plasma ...

The full buck moon will reach its peak illumination on Thursday, July 10. It’s just one of this month’s celestial highlights.

Lake Effect astronomy contributor Jean Creighton shares some myths behind some of our solar system’s most famous moons and ...