The power of a cosmic lens to magnify and split the light from a distant, mass-accreting giant black hole into four components has allowed researchers to measure the black hole's spin. See Letter p.207
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ACS & NICMOS/ESA/HST/STSCI/AURA/NASA/Ref. 10
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Risaliti, G. Cosmic lens reveals spinning black hole. Nature 507, 173–174 (2014). https://doi.org/10.1038/nature13209
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DOI: https://doi.org/10.1038/nature13209
