Free Astronomy Magazine November-December 2017

Cassini looks over the heavily cratered surface of Rhea during the spacecraft's flyby of the moon on March 10, 2012. [NASA/JPL/Space Science Institute] Saturn's largest and second largest moons, Titan and Rhea, appear to be stacked on top of each other in this true-color scene from NASA's Cassini spacecraft. [NASA/JPL/Space Science Institute] Saturn's rings and small moon Prometheus obscure the Cassini spacecraft's view of the planet's second largest moon, Rhea. Prometheus, which orbits in the Roche Di- vision between the main rings and the thin F ring, can be seen just below the center of the image, in front of Rhea. [NASA/JPL/Space Science Institute] RHEA NOVEMBER-DECEMBER 2017 SATURN