A professor of astronomy at the University of Illinois, he is the author of Stars and Their Spectra (Cambridge), Stars (Freeman/Scientific American Library), Cosmic Clouds (Freeman/Scientific American Library), and numerous articles for popular and professional astronomy magazines.
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A professor of astronomy at the University of Illinois, he is the author of Stars and Their Spectra (Cambridge), Stars (Freeman/Scientific American Library), Cosmic Clouds (Freeman/Scientific American Library), and numerous articles for popular and professional astronomy magazines.
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