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Image Gallery > Image of the Week: December 17, 2008

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The one constant in the Universe: StarDate magazine
Unruly Flock 
Unruly Flock 
Saturn's rings curve gracefully around the giant planet in this view from the Cassini spacecraft, which is orbiting Saturn. The rings span almost a quarter-million miles, yet are only a few yards thick. The thousands of individual rings are held in check by the gravity of small moons, known as shepherds, that orbit between the rings. [NASA/JPL/SSI] For more information, see our December 17 program.

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