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16th of May 2022
Event Horizon Telescope image of Sgr A*
Last week, the Event Horizon Telescope collaboration released their image of the supermassive black hole at the centre of our Galaxy. Sagittarius A was the name given to the brightest radio source in the constellation of Sagittarius, and when higher angular resolution revealed that source contained several components, Sgr A* was the name given to the brightest, which coincides with the centre of the Milky Way. The Event Horizon Telescope used the technique of Very Long Baseline Interferometry and high frequency of 230 GHz (wavelength of 1.3mm) to achieve the angular resolution required to see the shadow the the black hole. This result follows earlier results from the EHT Collaboration for M87 and for Centaurus A. There are articles in The Conversation explaining how the team made this image and why it is such a big deal.

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