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Last updated on April 20, 2014 at 21:20 EDT

Prometheus Seen Throwing Snowballs Into Saturns F Ring

July 26, 2010

While orbiting Saturn for the last six years, NASA’s Cassini spacecraft has kept a close eye on the collisions and disturbances in the gas giant’s rings. They provide the only nearby natural laboratory for scientists to see the processes that must have occurred in our early solar system, as planets and moons coalesced out of disks of debris. Credit: NASA