by Ken Croswell
New observations now allow the seemingly impossible: measuring the speeds of some stars along the line of sight without ascertaining their Doppler shifts. The new method can deliver 1 kilometer-per-second accuracy for some of our nearest neighbors, including Proxima Centauri, Barnard's Star, Lalande 21185, and Kapteyn's Star.
Link: Proceedings of the National Academy of Sciences
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