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The book describes man's discoveries of parts of planet Earth that were accidental or planned. The period from 50,000 years ago to today's efforts in space exploration is described.
Sometimes, however, even scientists grope in the dark because the Earth does not easily reveal all its remaining secrets. Reality, as it often happens, is more exciting than any novel.
The book explores the fascinating world of comets, with a focus on Halley's Comet, whose return in 1986 served as the impetus for the book. Calder explores the history of man's relationship with comets, from ancient myths to modern science.