Stephen P. Maran worked at NASA for more than 35 years, on projects including the Hubble Space Telescope. He is the author of more than 10 books, including The Astronomy and Astrophysics Encyclopedia and Astronomy for Dummies, and is the press officer for the American Astronomical Society. He has an asteroid named for him and has been awarded the NASA Medal for Exceptional Achievement, the George Van Biesbroeck Prize of the American Astronomical Society, and the Astronomical Society of the Pacific's Klumpke-Roberts Award. He lives in Chevy Chase, MD. Laurence A. Marschall is the WKT Sahm Professor of Physics at Gettysburg College and the author of The Supernova Story. He is a regular columnist for Natural History, a contributing editor of Smithsonian Air and Space, and an astronomy contributor for The World Book Encyclopedia. He is the deputy press officer of the American Astronomical Society and has been published in numerous publications, including Astronomy, Discover, Harper's, Newsday, and The New York Times Book Review. He lives in Gettysburg, PA.