In a landmark observation by a team of international researchers, NASA's Juno spacecraft has, for the first time, clearly ...

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 to ...

Jupiter hosts the brightest and most spectacular auroras in the solar system. Near its poles, these shimmering lights offer a ...

Slightly larger than Earth's moon, Io is the innermost of Jupiter's Galilean moons, which in addition to Io include Europa, Ganymede and Callisto. Locked in a gravitational "tug of war" among Jupiter, ...

It’s not a big moon relative to a few of its neighbors, but Jupiter’s Io is exceedingly active, with volcanoes by the hundreds spewing lava plumes dozens of miles above its surface, per NASA. Infrared ...

Saturn and Neptune reach opposition, looking their best for the year. Jupiter and Venus shine bright before dawn, as does the zodiacal light.

The most volcanic body in the solar system, Io is an infernal hellworld that constantly spits sulfurous magma into space. And a new study suggests that it’s been that way for a long, long time. The ...

Can ground-based telescopes obtain the same image resolution of planetary objects as space-based telescopes, or even spacecraft directly orbiting other worlds? This is what a recently submitted study ...

Io, Europa and Ganymede had already shown their footprints through earlier observations. But Callisto, the farthest Galilean moon, remained a mystery.

The autumn night sky in Ireland is an observer's treasure-trove and the first celestial event of the season arrives on ...

When NASA’s Juno mission flies by Jupiter’s fiery moon Io on Sunday, July 30, the spacecraft will be making its closest approach yet, coming within 13,700 miles (22,000 kilometers) of it. Data ...