Mystery of the bright spots on Ceres

This image, taken by Dawn from an altitude of 2,700 miles (4,400km) and released today, shows how multiple bright spots are scattered over a region that measures about 55 miles (90 kilometres) across.
In early August, the spacecraft will be 900 miles (1,450km) above the surface when the bright spots will be more clearly in view.
And in December it will reach an altitude of just 225 miles (260km) above the surface, with images 100 times better than those taken previously.By this point, the origin of the bright spots should hopefully be discovered. 
Can you guess what's creating those unusual bright spots on Ceres? On March 6, NASA's Dawn spacecraft began orbiting Ceres, the largest body in the main asteroid belt between Mars and Jupiter. Even before the spacecraft arrived at the dwarf planet, images revealed mysterious bright spots that captivated scientists and observers alike. Until Dawn gets a closer look over the next few months, it's anyone's guess what those spots could be. So, go ahead! Cast your vote here :
http://www.jpl.nasa.gov/dawn/world_ceres/ 
 

Can you guess what's creating those unusual bright spots on Ceres? On March 6, NASA's Dawn spacecraft began orbiting Ceres, the largest body in the main asteroid belt between Mars and Jupiter. Even before the spacecraft arrived at the dwarf planet, images revealed mysterious bright spots that captivated scientists and observers alike. Until Dawn gets a closer look over the next few months, it's anyone's guess what those spots could be. So, go ahead! Cast your vote below. - See more at: http://www.jpl.nasa.gov/dawn/world_ceres/#sthash.FEDMwm39.dpuf