Physicists used an algorithm to combine telescope measurements of a black hole in a different way to the original analysis.Credit: S. Lai, N. Thyagarajan, O. I. Wong, and F. Diakogiannis; Commonwealth Scientific and Industrial Research Organisation The Event Horizon Telescope (EHT) collaboration wowed the world in 2019 with the first picture ever taken of a black hole's shadow. Some researchers were unconvinced, arguing that the circular shape seen in that shot was an artefact of the team's image-reconstruction techniques. Now, an independent group has reanalysed the EHT data, and its results, published on 11 November in Nature ' including new images of the black hole ' largely corroborate the original findings1. To image black holes, the international EHT collaboration stitches together data it collects simultaneously from an array of ground-based radio telescopes that stretches across several continents. The reconstruction is extremely challenging, but in principle the result is...
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