NASA scientists still don’t have a clear picture of the bright spots showing up on the surface of Ceres, a minor planet in the asteroid belt.

The Dawn spacecraft has delivered a glimpse of Ceres, the largest body in the main asteroid belt, in a new image taken 740,000 miles (1.2 million kilometers) from the dwarf planet. This is Dawn’s best image yet of Ceres as the spacecraft makes its way toward this unexplored world.