Comet Hartley 2, the target for Deep Impact’s close flyby (now just six days away!) made its closest approach to Earth on October 20, at a distance of 17.7 million kilometers. Astronomers at the great Arecibo radio telescope are taking advantage of its proximity to perform radar imaging of the comet’s nucleus in an imaging campaign that began on October 24 and continues through today. This morning they released a set of twelve images of the ….
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