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Nature 417, 905-906 (27 June 2002) | doi:10.1038/417905a

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Astronomy: Through a lens brightly

Edwin L. Turner

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Gravitational lensing of light from some of the most distant objects known could be more widespread than had been thought. If so, it could be good — and bad — news for cosmologists.

A massive object, such as a galaxy, that happens to lie near our line of sight from Earth to a distant astronomical source can gravitationally deflect the path of light from that source. As a result, the image that reaches us may be displaced, distorted, magnified and multiplied.