On the Cover: Photographing Saturn's rings is only one way to study them. This image was generated by a computer using data gathered by <i>Voyager 2</i>'s photopolarimeter while the rings occulted the star Delta Scorpii on August 25, 1981. The rings appear brightest where they are most opaque. The insert shows the F-ring with a resolution of one kilometer. This experiment, and the radio occultation experiment (pages 4–7), revealed details of the rings invisible to the spacecraft's cameras.
10 Twenty-five Years of Searching: SETI Scientists Celebrate an Anniversary: Woodruff T. Sullivan, III looks back on the history of the Search for Extraterrestrial Intelligence.
3 Q&A What are Syrtis Major and the other dark markings on Mars?
13 World Watch The Planetary Society's political advocacy efforts.
14 News & Reviews Echoes from a dead comet?
15 Society Notes "Steps to Mars" a success; dedicated volunteers help SETI.