Reviews Cosmic Challenge: The Ultimate Observing List for Amateurs by Philip S. Harrington Share this:EmailFacebookTwitterPinterestPocketRedditPrint By Science News April 8, 2011 at 9:48 am This guide to observing the heavens beckons backyard astronomers to find 187 targets using instruments ranging from binoculars to monster scopes. Cambridge Univ. Press, 2011, 469 p., $45.