We now have some idea of what those bright spots on the surface of Ceres are. In an article published last month in Nature, scientists report that the spots’ spectral readings are consistent with sodium carbonate. (They had initially been thought to be made up of hydrated magnesium sulfate.) Sodium carbonate suggests the existence of subsurface water or ice that was brought to the surface by an impact (the bright spots are all in impact craters; the brightest are found in Occator, a crater 92 km wide); the carbonates would have been left behind after the water boiled off. JPL, Scientific American.
Image credit: NASA/JPL-Caltech/UCLA/MPS/DLR/IDA/IAPS/INAF.
Previously: A Closer Look at Ceres’ Bright Spots.