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The first image of a black hole shadow is published

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The Event Horizon Telescope Collaboration released an image of M87* in simultaneous press conferences and a series of papers in the Astrophysical Journal Letters: an asymmetric bright ring about 42 microarcseconds across surrounding a dark centre. The dark region is the shadow cast by strong light bending near the photon sphere, not the horizon itself, and it is about two and a half times larger in diameter. The measured diameter yielded a mass of roughly six and a half billion suns, agreeing with the higher of two competing pre-existing estimates. Four imaging teams had worked independently and blind before comparing results.

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