Rhea is the second largest moon of Saturn, behind Titan, and the largest without an atmosphere. It is composed mostly of water ice, but has a small rocky core. Rhea's rotation and orbit are locked together (just like Earth's Moon) so that one side always faces Saturn. A consequence of this is that one side always leads the other. Rhea's leading surface is much more heavily cratered than its trailing surface. The above photograph was taken with the Voyager 1 spacecraft in 1980.
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NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.
Based on Astronomy Picture Of the Day
Publications with keywords: Saturn - Rhea
Publications with words: Saturn - Rhea
- A Lunar Corona with Jupiter and Saturn
- Jupiter and Saturn Great Conjunction: The Movie
- Great Conjunction: Saturn and Jupiter Converge
- Saturn and Jupiter in Summer 2020
- Great Conjunction over Sicilian Lighthouse
- Saturn and Jupiter over Italian Peaks
- APOD: 2020 August 13 Á Jupiter and Saturn Rising Beyond Alien Throne Rock