This image provided by NASA/JPL-Caltech shows an artist's conception of NASA's Deep Impact spacecraft that has an appointment with comet Hartley 2 on thursday Nov. 4, 2010. The encounter will mark ... more 
This image provided by NASA/JPL-Caltech shows an artist's conception of NASA's Deep Impact spacecraft that has an appointment with comet Hartley 2 on thursday Nov. 4, 2010. The encounter will mark only the fifth time a comet has been photographed up close -- and the first time two comets have been imaged by the same instruments and same spatial resolution, according to Jet Propulsion Laboratory. less 
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Associated Press | Photo By NASA/JPL-Caltech
Sat, Nov 6, 2010 3:16 AM EDT