The nature of ultraluminous X-ray astronomical sources has long been unclear. The latest observations of these rare systems provide some crucial clues, but still leave theorists scratching their heads. See Letters p.198 & p.202
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Gladstone, J. Small field with a large impact. Nature 514, 171–172 (2014). https://doi.org/10.1038/514171a
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DOI: https://doi.org/10.1038/514171a
