Jupiter's moon Io may be small (roughly the size of Earth's moon) compared to the planet (more than 1,300 Earths could fit inside Jupiter), but the moon still has a mighty impact on its parent ...

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.

Io completes one orbit around the planet every 42.5 hours. Jupiter’s massive gravitational influence squeezes Io as it orbits the planet, like a hand squeezing a rubber ball, ...

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.

NASA's Voyager 2 spacecraft made its closest approach to Jupiter. It came within 354,000 miles (570,000 kilometers) of the ...

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

These are some of the new eye-opening observations Juno has made while orbiting the gas giant planet, some 544 million miles away in space.The findings, presented at the European Geosciences Union ...

In March and April 2025, internet users shared a striking image that they claimed showed "Steeple Mountain," a massive point of interest on Jupiter's moon Io. NASA Jet Propulsion Laboratory ...

These are JunoCam images of Jupiter’s moon Io from its 3 February 2024 encounter. The first two images show Io illuminated by Jupiter-shine, and the rest are lit up by sunlight.