Astronomy: Black holes go extragalactic

@article{Bulik2007AstronomyBH,
  title={Astronomy: Black holes go extragalactic},
  author={Tomasz Bulik},
  journal={Nature},
  year={2007},
  volume={449},
  pages={799-801}
}
  • T. Bulik
  • Published 18 October 2007
  • Physics, Medicine
  • Nature
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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