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An unread, unused copy: no writing or highlighting, and no missing or damaged pages. Every book we sell is brand new, including our lowest-priced titles.
The six volumes in this latest installment of Isaac Asimov's 21st Century Library of the Universe--Fact and Fantasy--transport young astronomers into a realm of speculation, hypothesis, and at times outright conjecture. Each title invites the reader to alight on a continuum of possibility ranging from the probable and plausible to fantasy, folklore, fiction, and even, in the case of UFOs, fraud.