Turn a telescope to the eastern sky in the hours following midnight on Nov. 5 to see two colossal shadows darken the cloud tops of the gas giant Jupiter as the Galilean moons Io and Europa pass ...

Amazing views of Jupiter over the years via the Hubble Space Telescope. The moons of Io, Ganymede and hazy Uranus can be ...

ESA's Mars Express orbiter captured footage of the Mars' moon Deimos pass in front of Ganymede, Europa, Jupiter, Io and ...

When you buy through links on our articles, Future and its syndication partners may earn a commission. Io is the most volcanic world in the solar system, with around 400 volcanoes. Its extreme ...

Io is probably one of the most well-known moons in the solar system. Orbiting 422,000 kilometers above Jupiter, Io is the innermost of the four Galilean moons. Io, along with the other three Galilean ...

The hellish surface of a moon of Jupiter known as Io is riddled with hundreds of lava-spewing volcanoes that make the world one of chaos and violence. The brutal conditions also make Io intriguing to ...

Jupiter’s third-largest moon Io is covered by more than 400 active volcanoes, and it’s the most volcanically active world in our solar system. New radio images collected by an array of telescopes on ...

The spacecraft came to within 930 miles of Io's surface—the closest any spacecraft has flown by the Jovian moon in over 20 years. reading time 2 minutes The mutilated surface of Jupiter’s moon Io was ...

A NASA spacecraft is set to swing past one of Jupiter’s moons Thursday, giving astronomers a close-up view of one of the most volcanic spots in the solar system. The Juno probe, which has been ...

A NASA spacecraft made its closest-ever approach to Jupiter's moon Io, coming within 930 miles of the "surface of the most volcanic world," and the space agency released new images of the flyby. The ...

image: As the Cassini spacecraft gets closer to Jupiter, details heretofore not noticed are becoming obvious. The Great Red Spot, which only a week or two earlier appeared to lack features, is now ...

A global "ocean" of molten rock sloshes beneath the surface of Jupiter's moon Io, feeding the fiery satellite's prolific volcanism, a new study finds. Unlike Earth's magma, which tends to cluster in ...