Portrays geologist Eugene Shoemaker and explains the scientific reasoning that led him to construct his "impact theory," in which collisions with comets created

David Levy brings these "ghostly apparitions" to life. With fascinating scenarios both real and imagined, he shows how comets have wreaked their special havoc o

It was a lucky twist of fate when in the early1980s David Levy, a writer and amateur astronomer, joined up with the famous scientist Eugene Shoemaker and his wi

David Levy has held a lifelong passion for comets, and is one of the most successful comet discoverers in history. In this book he describes the observing techn

In this highly accessible book David Levy teaches the reader how variable stars work, and how to observe them.