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Cassini Images Ring Arcs Among Saturn's Moons
NASA's Cassini spacecraft has detected a faint, partial ring orbiting with one small moon of Saturn, and has confirmed the presence of another partial ring orbiting with a second moon. This is further evidence that most of the planet's small, inner moons orbit within partial or complete rings.
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+ More on Saturn's Moons
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Video: Four Years of Discovery
Memorable findings from the first four years of Cassini's sweeping exploration of Saturn are highlighted in this video.
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Tracking the Shepherd
The Cassini spacecraft tracks the shepherd moon Prometheus as it orbits Saturn.
This image is part of a sequence designed to monitor the evolution of a streamer of material in the F ring for nearly a full orbit, as it follows Prometheus. Here, Prometheus is just about to pass behind the planet.
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Southern Face of Tethys
Five hours after acquiring Ancient Rift, the Cassini spacecraft turned its cameras back to Tethys for a more southerly view. The southern reaches of Ithaca Chasma are seen here, along with the large crater Telemus just right of center.
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Opening a Channel
As Prometheus pulls away from an encounter with Saturn's F ring, its immediate effects on the ring material are clear. The moon has pulled toward it a faint streamer of material from the inner, flanking ringlet and even created a modest bulge in the ring's bright core.
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+ More on Prometheus
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Enceladus
25.0 km (15.5 mi)
Oct. 9, 2008 (SCET)
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