On the Cover: Modern techniques of image enhancement have enabled scientists to bring out photographic details that are barely visible in the negative and disappear when printed. This image of Halley's Comet, enhanced from photographs taken May 25, 1910 at Helwan, Egypt, shows a jet (center) shooting out behind the comet. Daniel A. Klinglesmith III
4 Through History with Halley's Comet: Donald Yeomans looks at the history of this celestial visitor.
8 Looking Into Halley's Comet: Julian Loeweand the staff of The Planetary Report showcase the armada of spacecraft studying the comet.
12 A Talk with Fred Whipple: Kelly Beattysits down with one of the "greats" of the solar system.
15 The International Halley Watch: An Experiment in Cooperation: Jürgen Raheand Ray L. Newburn, Jr. explain how professional and amateur astronomers alike are working together.
18 News & Reviews Other worlds; hype, seriously reconsidered.
19 Society Notes Halley's Comet, comparing the planets, and the 1984 audit.
20 World Watch The pace of U.S. deep space exploration.
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