What color is moonlight typically, and what other colors can moonlight look like from our perspective on Earth?

The hellish surface of a moon of Jupiter known as Io is riddled with hundreds of lava-spewing volcanoes that make the world one of chaos and violence. The brutal conditions also make Io intriguing ...

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

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 ...

NASA's spacecraft Juno did a flyby of Jupiter's moon Io to learn more about the lunar body's volcanic activity.

But now, it appears that Io’s hell has vanished — or rather, it was never there to begin with. During recent flybys of the volcanic moon by NASA’s Juno spacecraft, scientists measured Io’s ...

There are new, high-quality images of Jupiter's moon, Io, thanks to the nearest flyby of the celestial body by a spacecraft in decades. NASA released images Saturday taken by the Juno spacecraft ...

NASA's Juno mission has captured stunning new views of Jupiter's moon Io and its lava-scarred surface.

Scientists say Earth's Moon went through a period when it was a lot like Io, a moon of Jupiter that's full of volcanic activity.

NASA's Juno spacecraft will come closer to Jupiter's moon Io on Dec. 30 than any spacecraft has in 20 years, getting a good look at the solar system's most volcanic body.

In anticipation of capturing new Io views, NASA released a spectacular infrared image of Io that Juno snapped back in July from a distance of 50,000 miles (80,000 kilometers).