Io and Jupiter,Cassini image. Io,the round object at left,is one of the largest of the moons of Jupiter. Clouds in Jupiter's atmosphere form the backdrop to this image. Io has a diameter of 3642 kilometres,but Jupiter,the solar system's largest planet,dwarfs its moon,with a diameter of 142,984 kilometres. Io is the innermost of the four Galilean moons,orbiting Jupiter at a distance of 350,000 kilometres from its cloudtops. Image obtained on 1 January 2001 by Cassini's Imaging Science Subsystem (ISS) |