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David W. Hughes is Professor of Astronomy at the University of Sheffield and a VP of the RoyalAstronomical Society. Hughes was a co-investigator on the European Space Agency's Giottomission to Halley's comet. He has written widely on the history of astronomy and has served onmany space advisory committees.Carole Stott was formerly a professional astronomer--she was Curator of Astronomy at theRoyal Observatory, Greenwich, UK--and is now a full-time writer on space. Carole has writtenmore than 20 books and contributed to many encyclopedias and journals.