Dawn misson pages have plenty to explore. Only some highlights are included here below.
Dawn NASA mission home page [link]
Dawn NASA's JPL mission home page [link]
(For help nanigating NASA sites see this [link])
Dawn has been orbiting Ceres for months. The latest up-close photos are striking:
Dawn at Ceres [video link]
Dawn is an experimental spacecraft using novel ion propulsion:
Dawn ion propulsion [video link]
Recently Dawn saw on Ceres permanent shadows which might harbor water ice. Dawn's mission was recently (Jul 2016) extended so this can be explored further.
Shadows [video link]
More about the shadows and other Dawn news [link]