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The nucleus of Comet Wild 2 is shown in this image taken by the Stardust navigation camera during the spacecraft's closest approach to the comet Friday Jan. 2, 2004. Stardust swooped past the comet, flying though the bright halo of gas and dust that envelops it to scoop up for return to Earth less than an thimbleful of primitive leftovers from the formation of our solar system. (KEYSTONE/AP Photo/NASA/JPL) === BEST QUALITY AVAILABLE ===