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

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

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 ...

Observations made of Jupiter’s moon Io during the Juno mission’s flybys helped astronomers confirm how and why Io became the most volcanic world in the solar system.

The north polar region of Jupiter’s volcanic moon Io was captured by NASA’s Juno during the spacecraft’s 57th close pass of the gas giant on Dec. 30, 2023.

Io fast facts. Age: Io is about 4.5 billion years old, about the same age as Jupiter. Distance from Jupiter: Io is the fifth moon from Jupiter. Its average orbital distance is about 262,000 miles ...

The dense moon is the fourth largest satellite within the solar system, and unlike most of Jupiter and Saturn’s moons, Io is covered in a hellish landscape of more than 400 active volcanoes.

The volcanic moon, which orbits the gas giant Jupiter, has long been written off as a possible home for alien life, as its extreme temperature and lava-covered surface make it wholly inhabitable ...

Unlike Jupiter's famously erupting moon Io, which appears yellow due to an abundance of sulphur, the Moon would still have looked gray, he says, although the molten rock would have been bright red.

Observations made of Jupiter’s moon Io during the Juno mission’s flybys helped astronomers confirm how and why Io became the most volcanic world in the solar system.