Explains what comets are, how they are formed, and how their unusual orbits bring them into earth's view at predictable intervals, with a special focus on Halley's comet.

Comets 1990, Caedmon

ISBN-13: 9781559942430

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Comets 1989, HarperCollins Publishers

ISBN-13: 9780064450881

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Comets 1985, HarperCollins Publishers

ISBN-13: 9780064450171

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Comets 1984, Crowell, New York, NY

ISBN-13: 9780690044140

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Comets 1984, Crowell, New York, NY

ISBN-13: 9780690044157

Hardcover

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