Explanation: Saturn's ragged moon Rhea has one of the oldest surfaces known. Estimated as changing little in the past billion years, Rhea shows craters so old they no longer appear round their edges have become compromised by more recent cratering. Like Earth's Moon, Rhea's rotation is locked on Saturn, and the above image shows part of Rhea's surface that always faces Saturn. Rhea's leading surface is more highly cratered than its trailing surface. Rhea is composed mostly of water-ice but is thought to include about 25 percent rock and metal. The above image was taken by the robot Cassini spacecraft now orbiting Saturn. Cassini swooped past Rhea last month and captured the above image from about 350,000 kilometers away. Rhea spans 1,500 kilometers making it Saturn's second largest moon after Titan. Several surface features on Rhea remain unexplained including large light patches like those seen near the image top.

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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: Rhea - cassini spacecraft - KA Kassini Publikacii so slovami: Rhea - cassini spacecraft - KA Kassini
Sm. takzhe: Polumesyac Encelada Sputnik Saturna Elena v cvete Kassini smotrit na Saturn Saturn v infrakrasnom svete ot "Kassini" Morya na Titane otrazhayut solnechnyi svet Kassini priblizhaetsya k Saturnu "Kassini" peresekaet ploskost' kolec Saturna Vse publikacii na tu zhe temu >>