Discover published sets by community

Size: 4,821 kilometers in diameter. Interesting Facts: Callisto's surface is heavily cratered and it's thought to be the oldest landscape in the solar system. It has a very weak magnetic field.

Size: 3,121.6 kilometers in diameter. Interesting Facts: Europa's surface is mostly water ice, and it is believed to have an ocean of liquid water beneath its surface, potentially harboring extraterrestrial life.

Size: 3,643.2 kilometers in diameter. Interesting Facts: Io is the most volcanically active body in the solar system, with over 400 active volcanoes. Its volcanic activity is due to the intense tidal heating from Jupiter's gravity.