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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<\/p>\n
The Event Horizon Telescope (EHT) collaboration wowed the world in 2019 with the first picture ever taken of a black hole\u2019s shadow. Some researchers were unconvinced, arguing that the circular shape seen in that shot was an artefact of the team\u2019s image-reconstruction techniques. Now, an independent group has reanalysed the EHT data, and its results, published on 11 November in Nature \u2014 including new images of the black hole \u2014 largely corroborate the original findings1<\/a>.<\/p>\n 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 an image with the same level of detail, or resolution, that would be achieved with a single radio dish as wide as Earth. <\/p>\n Although blurry, the EHT shot of a supermassive black hole at the centre of the M87 galaxy was consistent with astrophysical models based on Albert Einstein\u2019s general theory of relativity, which first predicted the existence of black holes. The image had a bright ring of roughly the correct radius, given what was known about the size of the black hole, with a darker disk at the centre. <\/p>\n