14 October 2005
Vol 310, Issue 5746

About The Cover

Cover image expansion

COVER The collision of Deep Impact with the nucleus of Comet 9P/Tempel 1 as seen from the accompanying spacecraft. The nucleus is about 5 kilometers across, and several impact craters can be seen above the impact plume. Analysis of the debris plume by Deep Impact and dozens of telescopes worldwide showed that the nucleus had a low density and provided a view of the previously hidden interior of a comet. [Image: NASA/JPL/University of Maryland]