Io (/ ˈ aɪ. oʊ /), or Jupiter I, is the innermost and second-smallest of the four Galilean moons of the planet Jupiter. Slightly larger than Earth 's moon , Io is the fourth-largest moon in the Solar System , has the highest density of any moon, the strongest surface gravity of any moon, and the lowest amount of water by atomic ratio of any ...

6 days ago · Io is Jupiter's third-largest moon, spanning roughly 2,300 miles (3,700 kilometers) across, which makes it slightly bigger than Earth's moon. It orbits Jupiter at a distance of around 262,000 ...

Jan 29, 2025 · Jupiter’s moon Io is the most volcanically active world in the solar system, with hundreds of volcanoes, some erupting lava fountains dozens of miles (or kilometers) high.

Oct 26, 2022 · Io — Jupiter's fifth moon — is the most volcanically active body in the solar system. Io's surface is peppered with hundreds of volcanoes, some spewing sulfurous plumes hundreds of miles high.

Io is the fifth moon of Jupiter and the fourth largest moon in the solar system. It is the innermost of the Galilean moons that orbit Jupiter. Io is the most volcanically active body in the solar system, spewing out sulphur as high as 300 km (190 miles) in the air.

Io is the innermost of Jupiter’s four largest moons, which are also known as the Galilean moons (Europa, Ganymede, and Callisto are the remaining three). Because it’s the closest moon to its massive host planet, Io feels a strong gravitational pull as it orbits Jupiter.

Jan 2, 2024 · Passing within around 930 miles (1,500 kilometers) of Io, the most volcanic body in the solar system, on Saturday, Dec. 30, 2023, Juno was able to capture stunningly detailed images of the Jovian...

Dec 27, 2023 · NASA’s Juno spacecraft will on Saturday, Dec. 30, make the closest flyby of Jupiter’s moon Io that any spacecraft has made in over 20 years. Coming within roughly 930 miles (1,500 kilometers) from the surface of the most volcanic world in our solar system, the pass is expected to allow Juno instruments to generate a firehose of data.

Nov 4, 2024 · Io: Exploration. Most of what we know about Io comes from Galileo spacecraft, which made a detailed study of the Jupiter system—including Io—from orbit from December 1995 to September 2006, but it was Voyager 1 that spotted the first signs of the little moon’s powerful volcanism in 1979.

Apr 18, 2024 · Jupiter's moon Io is a volcanic hellscape—and has been since the solar system began Io is the most volcanic body known to science, and researchers have puzzled over its history for years. A...