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Nature 426, 781-782 (18 December 2003) | doi:10.1038/426781a

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Astronomy: Wide-angle lens

Joachim Wambsganss1

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Gravitational lenses produce multiple images of single astronomical objects. The most widely separated images of a quasar ever found reveal the dark-matter content of the lensing galaxies.

Record-breaking is usually gently incremental, each record a slight improvement on the last. It's rare that a new record more than doubles the old record-holding value, particularly one that had stood for more than two decades.

  1. Joachim Wambsganss is at the Physics Institute, University of Potsdam, Am Neuen Palais 10, 14469 Potsdam, Germany.
    Email: jkw@astro.physik.uni-potsdam.de