The largest asteroid, Texas-size Ceres, may be a mini-planet with a water-rich mantle. The Hubble Space Telescope imaged Ceres in December 2003 and January 2004, revelaing never-before-seen detail. Top: This contrast-enhanced false-color composite of Ceres is made from Hubble Space Telescope visible and ultraviolet images. Bottom: Surface features change position as Ceres rotates in this sequence of visible image. Hubble tracked Ceres through multiple 9-hour rotations.
NASA/ESA/STScI/J. Parker, P. Thomas, and L. McFadden; composite: Francis Reddy