Scientists have to explain how salt got to Ceres' surface, beside explaining other features including unusual crates and a tall peak with shinning slopes.
Dawn recently shared images of Ceres from an altitude of 915 miles showing the spots to be a cluster on the dwarf planet's landscape.
No crater was found around the mountain, surprising Ceres investigators. The mystery over the origin of the bright spots continues.
Images taken earlier this month by Dawn from an altitude of 2,700 miles above Ceres show the spots in greater detail than before.
