Do black holes exist? Observations at the finest resolution so far indicate that only gross deviations in the behaviour of gravity from that predicted by general relativity can invalidate the case that they do.
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Reynolds, C. Bringing black holes into focus. Nature 455, 39–40 (2008). https://doi.org/10.1038/455039a
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DOI: https://doi.org/10.1038/455039a
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