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.
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Wambsganss, J. Wide-angle lens. Nature 426, 781–782 (2003). https://doi.org/10.1038/426781a
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DOI: https://doi.org/10.1038/426781a