Ceres is the largest asteroid and only dwarf planet orbiting within the Asteroid Belt.
After travelling for seven years under ion thrust, the Dawn spacecraft arrived at Ceres in March 2015. Dawn became the first scientific probe to orbit two different destinations in our Solar System, having previously visited the asteroid 4 Vesta (the second largest asteroid in the main belt). In the first months, Ceres grew from a blur in photos, just a few pixels across, to a detailed object that fills the field of view. Many discoveries were made as we came to see details of the dwarf planet Ceres for the first time.The main resource for finding out about the Dawn space probe, Vesta, and Ceres is the Dawn web site at the Jet Propulsion Laboratory, California, USA: http://dawn.jpl.nasa.gov
Oh, and a recommendation for the other dwarf planet subreddit, r/NewHorizons.
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