Explanation: Iapetus has an unusual surface, one half of which is very dark, the other half very light. This caused it's discoverer Cassini to remark that Iapetus could only be seen when on one side of Saturn but not the other. The reason for the difference between hemispheres is presently unknown. Iapetus is the third largest of Saturn's moon behind Titan and Rhea. Iapetus is composed predominantly of water ice.

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Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (USRA)
NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.

Publikacii s klyuchevymi slovami: Saturn - sputniki Saturna Publikacii so slovami: Saturn - sputniki Saturna
Sm. takzhe: Polyarnoe siyanie vokrug severnogo polyusa Saturna Saturn noch'yu Luna zatmevaet Saturn Cveta Saturna ot "Kassini" Stereo-Elena Vremena goda na Saturne Severnyi shestiugol'nik na Saturne Vse publikacii na tu zhe temu >>