White spots on Ceres
The surface composition of Ceres is broadly similar to that of C-type asteroids. Some differences do exist. The ubiquitous features of the Cererian IR spectra are those of hydrated materials, which indicate the presence of significant amounts of water in the interior.
Bright Spots on Ceres Likely Ice, Not Cryovolcanoes
by NANCY ATKINSON on MARCH 3, 2015
While cryovolcanoes have been bantered around as a possibility, during the briefing yesterday the science team downplayed that possibility, citing several pieces of evidence.
First, Raymond said the spots are consistent with highly reflective materials that may contain ice or salts...