CERES

Largest Asteroid: Ceres is the largest object in the asteroid belt between Mars and Jupiter. It is classified as a dwarf planet and is the only one located in the inner solar system.

Composition and Size: Ceres is composed mostly of rock and ice, and it has a diameter of about 940 kilometers (590 miles). It accounts for about one-third of the total mass of the asteroid belt.

Water Ice and Possible Subsurface Ocean: Observations from spacecraft have revealed that Ceres has significant amounts of water ice on its surface, particularly in its polar regions. There is also evidence to suggest the presence of a subsurface ocean beneath its icy crust.