Title:[0319] Jupiter and its Galilean satellites Caption:Jupiter and its four planet-sized moons, called the Galilean satellites, were photographed in early March 1979 by Voyager 1 and assembled into this collage. They are not to scale but are in their relative positions. Reddish Io (upper left) is nearest Jupiter; then Europa (center); Ganymede and Callisto (lower right). Twelve other smaller satellites circle Jupiter, four inside Io's orbit and the others millions of miles from the planet. Not visible is Jupiter's faint ring of particles, seen for the first time by Voyager 1. Copyright: Credit:NASA

Title:[0350] Jupiter's Galilean satellites Caption:Jupiter's four largest moons as seen by the Voyager spacecraft at the correct relative scale. Copyright: Credit:NASA

Title:[4024] Family Portrait of Jupiter's Great Red Spot and the Galilean Caption:This "family portrait," a composite of the Jovian system, includes the edge of Jupiter with its Great Red Spot, and Jupiter's four largest moons, known as the Galilean satellites. From top to bottom, the moons shown are Io, Europa, Ganymede and Callisto. Copyright: Credit:NASA/JPL