"NASA's <a href=""http://www.nasa.gov/mission_pages/dawn/main/index.html"" target=""_blank"">Dawn</a> spacecraft began orbiting the dwarf planet Ceres in March. Scientists were surprised by the large white spots shining on Ceres, seen above. On its way to Ceres, Dawn spent time studying the proto-planet Vesta in 2001. Ceres and Vesta are the two most massive bodies in the main asteroid belt between Mars and Jupiter. The mission, launched in 2007, is giving scientists new knowledge of how the solar system formed and evolved."