SUMMARY: NASA's Cassini spacecraft has obtained the most detailed images ever taken of Saturn's rings, including new details about its B ring, of which little was known previously. Cassini went behind Saturn's rings on May 3, 2005, and this gave scientists on Earth a chance to probe the ringst. Cassini sent a series of radio signals as it traveled behind the rings; the weaker the signal, the more dense the material in the rings. This allowed scientists to determine the thickness and size of particles at each point in the rings.

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