"This fine translation is a god-send. . . . Surely you want to read what Galileo wrote. If so buy this book. Van Helden's introduction is scholarly; no one knows more about Galileo's telescope; the translation is superb; Van Helden's review of the reception of the Sidereal Messenger is profound; the bibliography is extensive. What more can I say?"--David W. Hughes, The Observatory " Sidereus nunclus] has never before been...