apr 8, 1934 - Swiss-American astronomer Fritz Zwicky and the German-American Walter Baade

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coin the term “supernova” and hypothesize (correctly) that they are the transition of normal stars into neutron stars, as well as the origin of cosmic rays. Zwicky also uses the virial theorem to deduce the existence of unseen matter (what is now called dark matter) in the universe, as well as the effect of gravitational lensing.

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