Morning Edition for January 7, 2010 Hear the Morning Edition program for January 7, 2010

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A view of the central region of the Milky Way galaxy. Dark matter accounts for over 70% of the mass of the Milky Way, but because dark matter is invisible, all we see when we look up in the sky is a small amount of stars, planets and gas. AP/NASA hide caption

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Astronomers Map Dark Matter 'Beach Ball'

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