Impact craters Figure 6: Degraded craters on Enceladus, imaged by Cassini , February 17, 2005. The Hamah Sulci can be seen running from left to right along the bottom quarter of the image. Craters from Enceladus's ct 2 and cp cratered units are visible above them. Impact cratering is a common occurrence on many solar system bodies. Much of Enceladus's surface is covered with craters at various densities and levels of degradation. From Voyager 2 observations, three different units of cratered topography were identified on the basis of their crater densities, from ct 1 and ct 2 , both containing numerous 10–20 km-wide craters though differing in the degree of deformation, to cp consisting of lightly cratered plains.  This subdivision of cratered terrains on the basis of crater density (and thus surface age) suggests that Enceladus has been resurfaced in multiple stages. Recent Cassini observations have provided a much closer look at the ct 2 and cp cratered units. These high-resolution observations, like Figure 6, reveal that many of Enceladus's craters are
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This note was uploaded on 12/15/2011 for the course AST AST1002 taught by Professor Emilyhoward during the Fall '10 term at Broward College.