Mapping spiral structure on the far side of the Milky Way

@article{Sanna2017MappingSS,
  title={Mapping spiral structure on the far side of the Milky Way},
  author={Alberto Sanna and Mark J. Reid and Thomas M. Dame and Karl M. Menten and Andreas Brunthaler},
  journal={Science},
  year={2017},
  volume={358},
  pages={227 - 230}
}
Measuring the far side of the Galaxy Direct measurements of distances to astronomical sources rely on parallax, which can usually only be measured for relatively nearby objects. The far side of the Milky Way has been impossible to measure accurately, because the parallax is very small and interstellar dust blocks optical light from those regions. Sanna et al. used radio interferometry to directly determine the parallax distance to a star-forming region on the far side of the Galaxy. They also… Expand
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