Vera Rubin

Vera Florence Cooper Rubin (/ˈruːbɪn/; July 23, 1928 – December 25, 2016) was an American astronomer who pioneered work on galaxy rotation rates.[1] She uncovered the discrepancy between the predicted angular motion of galaxies and the observed motion, by studying galactic rotation curves. This phenomenon became known as the galaxy rotation problem, and was evidence of the existence of dark matter.[2] Although initially met with skepticism, Rubin's results were confirmed over subsequent decades. Her legacy was described by The New York Times as "ushering in a Copernican-scale change" in cosmological theory.[1][3]
 
https://en.wikipedia.org/wiki/Vera_Rubin

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