Io (/ ˈaɪ.oʊ /), or Jupiter I, is the innermost and second-smallest of the four Galilean moons of the planet Jupiter.

5 days ago · 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.

6 days ago · Even by the standards of Io, the most volcanic celestial body in the solar system, recent events observed on the Jovian moon are extreme. Scientists with NASA’s Juno mission have discovered a volcanic hot spot in the southern hemisphere of Jupiter’s moon Io. The hot spot is not only larger than Earth’s Lake Superior, but it also belches out eruptions six times the total energy of all the ...

3 days ago · Juno was sent to Jupiter to study the giant planet, but that primary mission ended, and NASA extended the mission. Currently, it is performing flybys of three of the Galilean moons: Ganymede, Europa, and Io. We've reported on Juno's Io flybys previously.

Oct 26, 2024 · Io is Jupiter’s third largest moon, and the most volcanically active world in the solar system. Io was discovered on Jan. 8, 1610, by Galileo Galilei, along with Jupiter’s three other largest moons: Europa, Ganymede. and Callisto.

6 days ago · Even by the standards of Io, the most volcanic celestial body in the solar system, recent events observed on the Jovian moon are extreme.

Nov 4, 2024 · 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 …

Dec 14, 2024 · Flybys of Jupiter’s fiery moon Io, carried out by NASA’s Juno spacecraft, are helping to solve the enduring mystery of why the small moon is the most volcanically active body in our solar system.

Io is the innermost and third-largest of Jupiter’s four Galilean moons. Io is covered in hundreds of volcanoes. It is the most volcanically active world in the Solar System. Io can help us understand volcanism and tidal heating throughout the Solar System.

Apr 18, 2024 · Io is the most volcanic object known to science. A rust-hued orb, its rocky seas of lava are larger than cities and its eruption plumes arc across the sky like infernal umbrellas. Yet until...