New images of the largest asteroid Ceres taken by the Dawn spacecraft show that one of the mysterious bright spots is actually a cluster of smaller spots. The image above shows the spots.
Dawn was just under 14,000 kilometers from Ceres when it took this shot, and the resolution is 1.3 kilometers per pixel. It’s hard to say exactly what the structure of these things is; they may be a couple of big spots with lots of little ones, or they could be closely packed small bright areas. The bigger one is clearly ragged around the edges, so there’s certainly more structure to be seen on smaller scales here. Source: Ceres: New images show many many bright spots. Photo by NASA/JPL-Caltech/UCLA/MPS/DLR/IDA