page_title: Fritz Zwicky
section_title: Scientific work
hierarchical_section_title: Fritz Zwicky / Scientific work
caption_attribution_description: Български: Паметна плоча на родната къща на швейцарско-американския астроном Фриц Цвики English: The memorial plaque on the house in Varna where was born the helveto-american astrophysicist Fritz Zwicky Français&#160;: Plaque commémorative sur la maison de Varna (Bulgarie) où est né l'astronome américano-suisse Fritz Zwicky
context_page_description: 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".
context_section_description: Fritz Zwicky was a prolific scientist and made important contributions in many areas of astronomy.
caption: The memorial plaque on the house in Varna where Zwicky was born. His contributions to the understanding of the neutron stars and the dark matter are explicitly mentioned.
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