Size: Io has a mean radius of 1,131.7 miles (1,821.3 km) making it slightly larger than Earth's moon. It has a slightly elliptical shape, with its longest axis directed toward Jupiter.

T he acid yellow moon Io that orbits Jupiter may be less than 30% the size of Earth, but is considered the most volcanic body in our solar system. As demonstrated by explosive news from NASA on ...

Io is Jupiter's third-largest moon, spanning roughly 2,300 miles (3,700 kilometers) ... Based on the size of the mysterious surface feature and the levels of thermal radiation, ...

On Dec. 27, 2024, NASA's Juno spacecraft swooped by the volcanic world Io.It witnessed a giant eruption. As the space agency's basketball court-sized craft orbits Jupiter, it swings near the gas ...

Jupiter moon of Io is famed for its volcanoes. NASA just spotted the most powerful one yet Not only was the hot spot larger than Earth’s Lake Superior, but it also was seen belching out ...

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

Similar in size to Earth’s moon, Io has an estimated 400 volcanoes that continuously release plumes and lava that coat that moon’s surface. Designated Northwest Africa ...

Io is Jupiter's third-largest moon, spanning roughly 2,300 miles (3,700 kilometers) ... Based on the size of the mysterious surface feature and the levels of thermal radiation, ...