The sound of rings
By Ron Cowen, 15:51 PM April 15, 2008
Arriving at Saturn on June 30, the Cassini spacecraft sped through a 24,730-kilometer gap in the giant planet's rings. Three hours later, it crossed back in the other direction (SN: 7/10/04, p. 22: Available to subscribers at Titanic Images, Groovy Shots: Cassini arrives at Saturn). These pinpoint crossings helped shape the craft's orbit about Saturn.
The ring gap that Cassini traversed isn't entirely empty. It contains bits of dust, which Cassini plowed into at a speed of roughly 20 km per s...
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