View Full Version : Keeping the Rings In Line

2005-Sep-11, 02:18 PM
SUMMARY: This is an image of Saturn's tiny moon Prometheus, which shepherds the inner edge of Saturn's F ring. The irregular moon is only 102 km (63 miles) across but its gravity defines the edge of the ring, essentially keeping it in line. The image was taken by NASA's Cassini spacecraft on August 5, when it was 8.2 million km (5.1 million miles) from the planet.

View full article (http://www.universetoday.com/am/publish/keeping_the_rings_inline.html)
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