The discovery of giant X-ray bubbles above and below the centre of the Milky Way confirms that the central supermassive black hole was once more than 100 million times brighter than its current state.
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Kataoka, J. Activity bubbling up. Nat Astron 5, 11–12 (2021). https://doi.org/10.1038/s41550-020-01269-w
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DOI: https://doi.org/10.1038/s41550-020-01269-w
