The sharpest images ever taken of matter around the probable black hole at the centre of our Galaxy bring us within grasp of a crucial test of general relativity — a picture of the black hole's ‘point of no return’.
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Reynolds, C. Light on a dark place. Nature 438, 32–33 (2005). https://doi.org/10.1038/438032a
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DOI: https://doi.org/10.1038/438032a
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