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Nature 427, 613-615 (12 February 2004) | doi:10.1038/nature02279;
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The central image of a gravitationally lensed quasar
A galaxy can act as a gravitational lens, producing multiple images of a background object. Theory predicts that there should be an odd number of images produced by the lens, but hitherto almost all lensed objects have two or four images.
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