Ceres, Queen of the Asteroid Belt Ceres is the closest dwarf planet to the sun and the largest object in the main asteroid belt between Mars and Jupiter, with an equatorial diameter of about 600 miles. It became the first dwarf planet to be explored by a spacecraft when Nasa’s Dawn probe arrived in orbit last year to learn more about this world of ice and rock All photographs: Nasa/JPL/Rex Shutterstock and free to download from the Nasa site