SAN FRANCISCO — NASA’s Cassini spacecraft has spotted an object located right at the edge of Saturn’s A ring that is confounding scientists. Its name? Peggy.
This strange something was spotted by accident on April 15 when Cassini’s cameras were aimed at a tiny moon named Prometheus that orbits just inside another of Saturn’s rings. A member of the mission’s imaging team, astronomer Carl Murray of Queen Mary University of London, noticed an odd kink at the A ring’s edge that jutted outward.