On the Cover: The still-mysterious planet Mars appears in this digital mosaic composed of 104 images taken by <i>Viking Orbiter 1</i> on February 11, 1980. It was early northern summer on Mars and white clouds thinly veiled parts of the northern hemisphere. The southern winter is manifested in the carbon-dioxide-frosted polar cap, which appears blue in this color-enhanced image. A geologic boundary cuts across Mars, dividIng it into ancient cratered highlands in the south and a younger, heavily reworked surface In the north. We still have much to learn about this most Earth-like of our neighboring planets: How do the clouds form? How are the polar caps made? Why are the northern and southern hemispheres so different? We are still far from answering the most intriguing question of all: Was there ever life on Mars?
6 Planets Around Other Stars? Some Exciting New Evidence: Bruce Campbell gives an update on the hunt for extrasolar planets.
9 Tracking Asteroids—The Planetary Society Supports Astrometry Project: Jeremy Tatum announces a new Society-funded project to hunt for near-Earth objects.
12 Some Mysteries of Planetary Science: Carl Sagan takes a look at the current state of our understanding of planetary science, and the questions that remain.
3 Members' Dialogue Notes to President Reagan; NASA's space station.
17 World Watch CRAF and Cassini, Regan's Presidential Directive on Space Policy, and Soviet Mars missions.
18 News & Reviews Planetary climates compared, and the greenhouse threat.
19 Society Notes Lunar base perspectives, Mars, and activities down under.
20 Q&A Why can't Voyager 2 visit the Pluto/Charon system?