Comet's Green Halo
Photograph courtesy Gregg L. Ruppel
Blurred stars seem to cut through the green halo of comet 103P/Hartley 2 in a five-minute-exposure photograph taken through a backyard telescope in the United States on Saturday. In recent weeks the comet has been drawing closer to Earth, and Hartley 2 will make its closest pass tomorrow, offering prime viewing via binoculars and telescopes. Read on...
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