sentence: Asteroids are assigned a type based on spectral shape, color, and sometimes albedo.
sentences_after: These types are thought to correspond to an asteroid's surface composition. For small bodies which are not internally differentiated, the surface and internal compositions are presumably similar, while large bodies such as 1 Ceres and 4 Vesta are known to have internal structure.
concept_name: asteroid
headings: Asteroid spectral types
categories: Asteroids