Àdàkọ:POTD/2008-02-28
| Àwòrán Ọjọ́ Òní | |
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False-color mosaic shows the entire hemisphere of Iapetus (1,468 kilometers or 912 miles* across) visible from the Cassini orbiter on the outbound leg of its encounter with the two-toned moon of Saturn in September 2007. The central longitude of the trailing hemisphere is 24 degrees to the left of the image's center. It is hypothesized that the moon's two-toned nature is due to the sublimation of various ices evaporated from the other hemisphere, which faces the sun. Photo credit: Cassini orbiter |