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Comet! Story Behind Halley’s Comet by Greg Walz Chojnacki HC 1985 EX-LIB
Comet! Story Behind Halleys Comet by Greg Walz Chojnacki HC 1985 EX-LIBEx-Library Book
Copyright 1985
Hard Cover
64 Pages
There are two reasons it's fun to look into the night sky. First, the patterns of light and motion we find beyond our planet
are among the most beautiful nature has to offer. Second, when we ask what those patterns of light really are, we discover some of the strangest and most fascinating things our minds can encounter.
A comet provides the perfect opportunity to enjoy the double fun of astronomy. Nothing matches the sight of a comet's glowing head and wispy tail hanging above the horizon. And because comets are so unusual, it's natural to wonder why they're so different. Why do they appear so suddenly - then disappear just as quickly? What are they really? Where do they come from?
In the following pages, you'll see that the mystery of comets matches their beauty. In fact, comets are among the most challenging puzzles of astronomy. As you find out what we know - and don't know - about comets, you'll see why astronomers are so excited about Comet Halley.
Of course, you're excited about the chance to see a comet! One aim of this book is to help you get the best possible look at Halley's Comet.
You may have heard that the coming appearance of Comet Halley is going to be disappointing. Nothing could be further from the truth. This may be the best return of Halley ever: With our ability to reach into space, we have the opportunity to make many new discoveries about comets. A second purpose of this book is to help you share the excitement of these discoveries.
As you observe Halley, you may discover a third - perhaps the most important - reason people enjoy stargazing. Looking into the vast universe, you may suddenly find yourself thinking about our own planet from a completely new and satisfying point of view. If you have this experience while observing Comet Halley, you'll find that this once-in-a-lifetime return is just the beginning of a lifetime of discovering the universe and our place in it.
While only the author's name appears on the cover of this book, most of the staff of AstroMedia Corp. contributed to this project; my thanks especially to Nancy Mack, Pat LaBrecque, Jane Borth Lucius, Mary Algozin, Susan Poole, and Mary MacAdam for their help (and patience!). Thanks also to my friend Frank Reddy for both his excellent maps and excellent advice. Dan Green of the Harvard Astrophysical Center contributed helpful comments on early drafts of the manuscript. Finally, special credit goes to Ruth Freitag of the Library of Congress, whose compilation of historical images proved so useful.
CONTENTS
Introduction4
An Ancient Puzzle5
What Is a Comet?11
Where Do Comets Come From?17
Do Comets Affect Earth?23
The Halley Missions29
The Return of Halley's Comet37
Projects
Build a Comet50
Looking for Meteors55
The View From Space60
Index62
Glossary64
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