A group of scientists from NASA's Dawn mission suggests that when sunlight reaches Ceres' Occator Crater, a kind of thin haze of dust and evaporating water forms there. This haze only becomes dense enough to be seen by looking at it laterally, as in this image, the scientists wrote in the journal Nature in December 2015.
Occator measures about 60 miles (90 kilometers) wide, and contains the brightest material seen on Ceres.
http://photojournal.jpl.nasa.gov/catalog/PIA20181
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