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.

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 ...

On the fiery Io, the innermost and third-largest of Jupiter’s four Galilean moons, Juno's observations have provided more insights about its incessant volcanic activity.

Because Io is so close to its massive host planet, the moon is subjected to a tremendous gravitational pull as it orbits ...

On March 9, 1979, Linda Morabito discovered a volcanic plume on Io, a moon of Jupiter, in one of the photos from Voyager 1. She wrote, “I could feel tears begin to roll down my face at the sight ...

If you look at the gas giant with a telescope as it’s rising, you’ll spot three of its Galilean moons: Io alone to the west, with Ganymede (closer) and Callisto (farther) to the east.

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.

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.

But it did not just get up close and personal to the planet on May 16, it also flew by Io, getting as close as 35,500 kilometers (22,060 miles), and taking its closest pictures yet of the volcanic ...

An hour after the shadow transit begins (12:18 A.M. EDT, on the 27th in the Eastern time zone only), Jupiter is very low from the East Coast as Io's shadow is nearly to the center of the disk and ...

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 ...

In the latest of more than 50 flybys, NASA's Juno spacecraft is slated to pass Jupiter's volcanic moon Io on Tuesday. The agency said this will be the closest flyby to date.