Fritz Zwicky — Swiss Scientist born on February 14, 1898, died on February 08, 1974

Fritz Zwicky was a Swiss astronomer. He worked most of his life at the California Institute of Technology in the United States of America, where he made many important contributions in theoretical and observational astronomy. In 1933, Zwicky was the first to use the virial theorem to infer the existence of unseen dark matter, describing it as "dunkle Materie"... (wikipedia)

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