The sound of rings

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.