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 ...

A new animation reveals an enormous lava lake on the surface of Jupiter's moon Io. The close-up view comes from NASA's Juno spacecraft, which swept within 930 miles (1,500 kilometers) of the ...