Description: (Swiss Astronomer Known For His Inference and Existence of Unseen 'Dark Matter' using Virial Theorem)
Fritz Zwicky, a Swiss astronomer, made significant contributions to theoretical and observational astronomy during his career at the California Institute of Technology in the United States. In 1933, he utilized the virial theorem to propose the existence of unseen dark matter, a groundbreaking discovery that led to the coining of the term "dunkle Materie." Zwicky's work in this field laid the foundation for further research and enhanced understanding of the universe's composition and structure.