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Mystery Solved? Ceres' Bright Spots Likely Made of Salt

The mysterious bright spots on the dwarf planet Ceres may be composed of the same basic stuff that makes a foot bath feel so good, a new study reports.

Observations made by NASA's Dawn spacecraft, which has been orbiting the dwarf planet since March, suggest that Ceres' many bright spots could be made primarily of hydrated magnesium sulfates.

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