White young crater on Rhea

Caption NASA originale:"Looking closely at Saturn's moon Rhea during a distant flyby, Cassini provides this view of what appears to be a bright, rayed and therefore relatively young crater. This crater was also observed by Cassini at much lower resolution in the fall of 2004 and in spring of 2005. For comparison, viewing the same crater near the terminator (the line between day and night) would highlight the crater's topography (vertical relief), compared to its brightness, which is highlighted in this view where the Sun is at a higher angle.
North on Rhea is up and rotated about 15° to the left. This view shows principally the leading hemisphere on Rhea".

Nota: guardate molto bene il bordo di Rhea e poi chiedeteVi se esso sembri di più il bordo di una 'sfera' o di uno 'sferoide'. Poi, se avete tempo e voglia, provate a rileggere i commenti del Prof. Hoagland sulla forma di Giapeto e sulle sue possibili cause ed implicazioni.