This is a NASA Hubble Space Telescope color image of Ceres, the largest
object in the asteroid belt.
Astronomers enhanced the sharpness in these Advanced Camera for Surveys
images to bring out features on Ceres' surface, including brighter and
darker regions that could be asteroid impact features. The observations
were made in visible and ultraviolet light between December 2003 and
January 2004.
The colors represent the differences between relatively red and blue
regions. These differences may simply be due to variation on the surface
among different types of material.
Ceres' round shape suggests that its interior is layered like those of
terrestrial planets such as Earth. Ceres may have a rocky inner core, an
icy mantle, and a thin, dusty outer crust inferred from its density and
rotation rate of 9 hours. Ceres is approximately 590 miles (950
kilometers) across and was first discovered in 1801.