Reviews Cosmic Challenge: The Ultimate Observing List for Amateurs by Philip S. Harrington Share this: Share via email (Opens in new window) Email Click to share on Facebook (Opens in new window) Facebook Click to share on Reddit (Opens in new window) Reddit Click to share on X (Opens in new window) X Click to print (Opens in new window) Print 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.