SPACE PHOTOS THIS WEEK: Wavy Rings, Dark Dunes, More

SPACE PHOTOS THIS WEEK: Wavy Rings, Dark Dunes, More
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June 11, 2009--The tiny moon Daphnis carves waves into the edges of Saturn's rings inside the Kepler Gap, a 26-mile-wide (42-kilometer-wide) span within the planet's outermost rings.

Although the moon is a mere 5 miles (8 kilometers) across, its gravity pushes particles inside the rings to form structures as much as a mile (1.5 kilometers) high. The unique image above is possible only during Saturn's equinox, about every 15 years, when sunlight casts long shadows across the face of the rings.
—Image courtesy NASA/JPL/Space Science Institute
 
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