Giles Sparrow is a writer specializing in astronomy and space science.He has degrees in astronomy and science communication, and has worked for 15 years as an editor and author, writing on subjects ranging from particle physics to geography.An avid follower of the unfolding story of space exploration, he has written on space technology and the history of spaceflight in a wide range of books, including DK Publishing's bestselling Universe. ? Ian Ridpath is an award-winning writer, broadcaster, and lecturer on astronomy, having previously worked at the University of London Observatory. A fellow of the Royal Astronomical Society, he is the editor of the Oxford Dictionary of Astronomy and Norton's Star Atlas, which is considered by many to be the amateur astronomer's bible. He has written or edited more than 40 books, including several standard guides to the night sky, and many articles on astronomy.