One good cosmic measure

@article{Girardi2014OneGC,
  title={One good cosmic measure},
  author={L. Girardi},
  journal={Science},
  year={2014},
  volume={345},
  pages={1001 - 1002}
}
Radio-wave interferometry provides an accurate measurement of cosmic distances [Also see Report by Melis et al.] As Earth orbits around the Sun, nearby stars are seen to move against the background of more distant stars and galaxies. The angular amplitude of this motion is called parallax and provides a direct, trigonometric measurement of the stellar distances as compared to the size of Earth's orbit. A great achievement of the European Space Agency's satellite Hipparcos (1) was the… Expand

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