Mistaken Identity: Ceres' Mysterious Bright Spots Aren't Epsom Salt After All

It's a case of mistaken identity: The mysterious bright spots on the surface of the dwarf planet Ceres were thought to be composed of hydrated magnesium sulfate (similar to the magnesium sulfate sold as Epsom salt), but new work reveals a different chemical signature in these bright dots, cooked up in watery conditions beneath its crust.