When1: 1933
When2: 1937
Who: Fritz Zwicky [Zwicky, Fritz]
What: astronomer
Where: Germany
Detail: He lived 1898 to 1974. Coma-cluster galaxies move so fast that the cluster would dissipate, so there must be more mass there [1933]. Gravitational lensing can test relativity, magnify distant objects, and find missing matter [1937].
Physical Sciences>Astronomy>History>Cosmology
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Date Modified: 2022.0224