Interplanetary Exploration
The Asteroid Belt is a circumstellar disk of the Solar System that lies between the orbits of Mars (1,5 AU) and Jupiter (5,2 AU). It houses a multitude of irregularly shaped astronomical objects, called asteroids, and the dwarf planet Ceres. This region is also called the main belt in order to distinguish it from other minor body groupings in the Solar System, such as the Kuiper Belt or the Oort Cloud, as well as the trojans and centaurs. An asteroid is a rocky celestial body in the Solar System, smaller than a planet and larger than a meteoroid. The main objects of the belt are Ceres (which, as mentioned, is considered a dwarf planet and not an asteroid), Vesta, Pallas, Hygiea and Juno.