The Nobel Prize in Physics recognises black holes twice over

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The Royal Swedish Academy of Sciences awarded half of the prize to Roger Penrose for showing that black hole formation is a robust prediction of general relativity, and the other half jointly to Reinhard Genzel and Andrea Ghez for the discovery of a supermassive compact object at the centre of the Milky Way. The division is itself the structure of the subject: one half for the theory that said such things must exist, one half for the decades of measurement that found one.

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