the Jet Propulsion Laboratory
This site discusses the mission that successfully crashed a man-made object into a comet to determine its inner structure. The site includes the objectives of the mission, descriptions of the instruments used, definitions of terms used, animations, and educational materials related to the topic.
In particular, the Image Gallery has images taken before and after the crash, and Mission Update gives the latest interpretation of the images and other data collected.
%0 Electronic Source %A A'Hearn, Michael %D October 2, 2007 %T Deep Impact Comet Mission %I Jet Propulsion Laboratory %V 2015 %N 27 November 2015 %8 October 2, 2007 %9 text/html %U http://solarsystem.nasa.gov/deepimpact/index.cfm
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