Photo captures an ongoing volcanic eruption on Io, one of Jupiter's moons. Hot lava, plateaus and valleys are visible in representative color.

Find pictures of Jupiter's moon, and analysis of its surface, volcanic, and energy activities.

National Space Science Data Center offers full-color images and composites of the moon and its volcanoes. Read official press-release captions.

Features findings about this Jupiter moon, plus an interior model, quick-look statistics, and animations.

University of Oregon's Institute of Theoretical Science explains why Io's volcanoes resemble geysers.

Explore news and images from the Galileo spacecraft's observations of Io. Find feature stories, classroom materials and real-time data.

Guide to volcanic activity on Io, one of Jupiter's Galilean satellites. Learn about recent eruptions and the composition of Io.