The moons that orbit Saturn may be increasing by one -- an icy, pint-sized object that astronomers have named “Peggy.” NASA’s Cassini spacecraft has spotted evidence that a mysterious object measuring perhaps half a mile across is disturbing the outer edge of Saturn’s large, bright A ring. The object’s gravity seems to have roughed up the ring’s usually smooth profile. As a result, a stretch of the A ring that measures 750 miles long and 6 miles wide is now about 20% brighter than it would typically appear. The fuzzy blob on the A ring’s edge was imaged by Cassini’s...
