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Seeing dark matter in the Andromeda galaxy

By Vera Rubin, from the archives, via @physicstoday

This is a story of why and how Kent Ford and I studied the orbital velocities of stars in the Andromeda galaxy 40 years ago. Our study was influential in the later conclusion that most of the matter in the universe is dark.

https://pubs.aip.org/physicstoday/article/59/12/8/387114/Seeing-dark-matter-in-the-Andromeda-galaxy

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