You can read lots of these - SkyNews', the ESA's, 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 Suzaku's loss of the X-ray Spectrometer. Oh, and one more category - what was, in 2005, the most serendipitous discovery in astronomy?