You can read lots of these - "http://skyandtelescope.com/news/article_1649_1.asp" [Broken], for example - I thought it might be fun to take a different view! What were the most notable non-discoveries for 2005? What were the most outstanding failures? I'll go first. In the second category, I nominate "http://skyandtelescope.com/news/article_1564_1.asp" [Broken]. Oh, and one more category - what was, in 2005, the most "http://www.m-w.com/cgi-bin/dictionary?book=Dictionary&va=serendipity" [Broken] discovery in astronomy?