The Galilean moon Io has already lost sextillions of tons of sulfur, and will someday run out of this element. ... Jupiter’s moon Io has likely been active for our solar system’s entire history.

As the innermost of Jupiter’s four Galilean moons, Io is stuck between the planet’s immense gravitational force and the gravitational tug of its sister moons Europa and Ganymede.

NASA spotted something moving in one of the moons of Jupiter. Some natural satellites have similar structures to the Earth, ...

Io is one of Jupiter’s four Galilean moons. In its close orbit around the titan, Io is at the mercy of a mighty gravitational influence, and is baked by the planet’s radiation.

Ganymede and Io are one-half of the Galilean moons, discovered by Galileo Galilei in the 17th century. They’re quite different from one another: Ganymede is icy, and Io is volcanic.

Researchers reported auroras around Jupiter’s two largest Galilean moons for the first time and found new features in the auroras of volcanic Io and icy Europa. By Robin George Andrews A ...

Jupiter has 95 known moons and the four largest – Io, Europa, Ganymede and Callisto – are known as the Galilean moons. Juno flew within 352 kilometres of Europa last year and provided the ...

Io, one of Jupiter's four Galilean moons, is the most volcanically active body in the solar system, boasting over 400 active volcanoes that erupt continuously.

It has 95 known moons and its four largest–Io, Europa, Ganymede, and Callisto–are called the Galilean moons. Io is most volcanically active.

NASA's recent flybys of Io, however, have revealed that it likely doesn't contain a global magma ocean beneath its surface, as determined by new observations of the moon's gravity. Instead, each ...

NASA has eight more flybys of Io planned for Juno over the next 18 months, including two that will pass within 930 miles (1,500 kilometers) of the surface to provide perhaps our best view yet of ...