Return to Science     NASA Image Gallery Return to NASA Thumbnails     1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Solar System - Jupiter and its four planet-size moons Jupiter and its four planet-size moons, called the Galilean satellites, were photographed and assembled into this collage. They are not to scale but are in their relative positions. Image Credit: NASA/JPL