Volume 5, number 1
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(Planetary Society members only)
3 Planets and Perils: Owen B. Toon takes us on a tour of of catastrophic events in Earth's history.
4 Volcanoes and Atmospheres: Catastrophic Influences on Planets: Susan Werner Kieffer discusses the lessons of volcanic eruptions on Earth and elsewhere in the solar system.
7 A Talk With Eugene Shoemaker: Charlene Anderson sits down with one of the world's experts in impact cratering events to discuss the impact thought to have killed the dinosaurs.
12 Greenhouses and Glaciers: Climate Change and the Continuously Habitable Zone Around the Sun: James F. Kasting looks at the complicated factors of habitability.
16 Precessing Worlds: Planetary Spin and Climatic Stability: William R. Ward explains the effects of a wobbling planet.
20 Intelligence and Catastrophe: The Cosmic Quarantine Hypothesis: Why haven't we discovered any extraterrestrial civilizations? Steven Soter investigates.
11 News & Reviews Triton and Pluto; Ionian volcanism.
18 World Watch Europe and the U.S. propose joint space ventures.
19 Society Notes Hans Mark rejoins board; New Millennium Committee scholarships.