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Comet Big chunks of ice that have a cloudy tail and orbit the sun Asteroid Large (800km) or small (0.1km) rocks and metal that orbit around the sun. Meteoroids Small rocky bodies that revolve around the sun Meteorite Meteoroids that do not burn up completely and hit the ground. Meteor A visible path of a meteoroid that has entered the Earth's (or other bodies) atmosphere Moon Natural Satellite that revolves and rotates around a planet, usually made of rock or metals Galilean Moons Io, Europa, Ganymede, Callisto Io most volcanically active in solar system Europa smallest of Galilean moons Ganymede only moon to have its own magnetic field Callisto rocky core, icy mantle