On the Cover: The hard, rocky planets lead violent lives, bombarded from space, riven by tectonic forces, beset by volcanic eruptions, and their faces bear the scars. This is the Memnonia Fossae region on Mars. Here we see impact craters that have been weathered by wind and possibly water, partly filled in by lava from the great Tharsis volcanoes, and then, for the large crater at the top, cracked apart by tectonic forces. By determining the order in which such scars form, scientists piece together the history of a planet. (This image covers an area 206 kilometers, or 128 miles, across.) Alfred McEwen, U.S. Geological Survey
4 What is the Value of Space Exploration? Charlene Anderson presents the opinions of a powerful group of thinkers, addressing possibly the most difficult question to answer in our advocacy of planetary exploration.
6 Steps to Mars II: A Conference Report: Louis Friedmanpresents experts' reports from the second of the Society's Mars exploration conferences.
12 On Target: Galileo Approaches the Jovian System: Charlene Andersongives a brief guide to the mission to help you get the most from Galileo's anticipated discoveries.