Bright and dark layers on Phoebe

Bright and dark layers on Phoebe

Fig. 10.29 . Saturnís mid-sized, retrograde moon, Phoebe, is most likely an ice-rich body overlain with a thin layer of dark material. The sharply defined crater at above center exhibits two or more layers of alternating bright and dark material. The layering might have occurred during the crater formation, when material ejected from the crater buried the pre-existing surface that was itself covered by a relatively thin, dark deposit over an icy mantle. This image was taken from the Cassini spacecraft during its Phoebe flyby on 11 June 2004. (Courtesy of NASA/JPL/SSI.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University