A geometric distance to the galaxy NGC4258 from orbital motions in a nuclear gas disk

@article{Herrnstein1999AGD,
  title={A geometric distance to the galaxy NGC4258 from orbital motions in a nuclear gas disk},
  author={J. Herrnstein and J. Moran and L. Greenhill and P. Diamond and M. Inoue and N. Nakai and M. Miyoshi and C. Henkel and A. Riess},
  journal={Nature},
  year={1999},
  volume={400},
  pages={539-541}
}
The accurate measurement of extragalactic distances is a central challenge of modern astronomy, being required for any realistic description of the age, geometry and fate of the Universe. The measurement of relative extragalactic distances has become fairly routine, but estimates of absolute distances are rare. In the vicinity of the Sun, direct geometric techniques for obtaining absolute distances, such as orbital parallax, are feasible, but such techniques have hitherto been difficult to… Expand
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