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 …

Feb 4, 2025 · 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 …

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 …

Apr 18, 2024 · Jupiter's moon Io is the solar system's most volcanic body thanks to a gravitational tug of war that rages below its surface. But now scientists know the violent moon has always …

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 …

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 …

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 …

Feb 7, 2024 · NASA’s Juno spacecraft just made the closest flybys of Jupiter’s moon Io that any spacecraft has carried out in more than 20 years. An instrument on this spacecraft called …

Feb 3, 2025 · Io’s extreme volcanic activity is driven by the immense gravitational forces of Jupiter. Roughly the size of Earth’s Moon, Io follows an elliptical orbit around the gas giant, …

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 …