Volcanic Io
When NASA’s Voyager 1 mission zipped by the Jupiter system in 1979, it discovered that far from the sun were worlds of unimaginable activity. In particular, it shot spectacular pictures of the moon Io, which was covered in volcanoes and is now known to be one of the most geologically active places in the solar system. This image shows a plume from a volcano on Io’s surface.
Image: NASA/JPL
