Dawn spacecraft with a nebula in the background
Dawn spacecraft with a nebula in the background
About four and a half billion years ago, the Main Belt asteroids formed from a disk of dust and ice particles over the course of only about 10 million years. They include Ceres (right), the largest dwarf planet in the main asteroid belt – with a diameter of nearly 1000 kilometres, and Vesta (to the left of the Dawn spacecraft), the third largest body. The representations of the two asteroids are based on images acquired by the Hubble Space Telescope, artistically modified in accordance with scientific criteria. The background image is also based on realistic assumptions and was created by the planetary researcher William Hartmann from the Planetary Science Institute in Tucson (Arizona).
