Volume 16, number 4
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(Planetary Society members only)
6 Geology and Climate Change: Mechanisms of Extinction: Kevin Pope discusses the horrific processes that could have wiped out over half the species living on Earth.
7 Impact Processes: Reconstructing the Events: Michael Rampino gives an idea of what it would have been like to see the K/T object hit Earth (from a safe place!).
8 Mineralogy: Carved in Stone: Alfred Fischer describes how evidence can be found in the tiniest of details—in the types of rock and what they are made of.
10 Stratigraphy: Layers of Evidence: David King tells us how the rocks blasted out by the K/T impact can tell us much about its aftermath.
12 Comet Hyakutake: A Very Pleasant Surprise: Charlene Anderson presents stunning images of this surprise visitor that put on a magnificent show for nearly everyone on Earth.
14 Why Near-Earth Objects? Carl Sagan explains how NEOs are crucial to understanding the history and future of the solar system.
3 Members' Dialogue SETI debate.
15 World Watch Future missions for the ESA and NASA; Russian rockets.
16 News & Reviews Reporting on missions: Voyager vs. Galileo.
17 Society News Celebrating Viking's 20th anniversary; watching comets.
18 Basics of Spaceflight Electrical systems.
20 Q&A How do we know what types of signals detected by SETI warrant investigating?