On the Cover: We glimpse the ancient past through rocks that have survived their fall through Earth's atmosphere. Some of these meteorites, a type called carbonaceous chondrites, contain material virtually unaltered since the formation of our solar system. In this sample from the Allende meteorite, which fell in 1969, the 0.5-millimeter spherical chondrules appear in a dark, carbon-rich matrix. Some carbonaceous chondrites contain complex organiC molecules, including amino acids, the building blocks of carbon-based life.
4 Killer Rocks and the Celestial Police: The Search for Near-Earth Asteroids: Donald Yeomans looks at the history and future of monitoring for potential suspects.
8 Asteroids and Comets in Near-Earth Space: Richard Binzel discusses how studying these seemingly unrelated bodies can tell us about the origins of our solar system.
16 The Sky is Falling: The Hazard of Near-Earth Asteroids: John Pike explains the potential threat of our flyby neighbors.
3 Members' Dialogue Commentary on Russian and European space efforts.
23 World Watch Freedom vs. space missions, Galileo's antenna, and the Kamchatka rover tests.
25 State of The Planetary Society A report to our members.
26 News & Reviews Cosmic catastrophes.
27 Society Notes Asteroid contest winner; help with the Mars rover test in the Mojave Desert.