The mass of a black hole beyond our Galaxy has been calculated, thanks to the presence of an associated star. The hole is the weightiest yet, placing intriguing constraints on how this binary system developed.
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W. PIETSCH, MPE/ESA
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Bulik, T. Black holes go extragalactic. Nature 449, 799–801 (2007). https://doi.org/10.1038/449799a
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DOI: https://doi.org/10.1038/449799a
