Fritz Zwicky

Fritz Zwicky (February 14, 1898 – February 8, 1974) was a Swiss astronomer. He created the idea of dark matter.[1] He worked at California Institute of Technology for most of his life.

Zwicky in 1947

References
  1. http://spiff.rit.edu/classes/phys440/lectures/gal_clus/gal_clus.html
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