Fritz Zwicky
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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
Zwicky in c. 1970
Zwicky in c. 1960
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.
Presentation of the Presidential Medal of Freedom to Fritz Zwicky by Secretary of the Navy Dan A. Kimball and General S. Chapman US Air Force, September 1949, Azusa, California
Tired light
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Tired light is a class of hypothetical redshift mechanisms that was proposed as an alternative explanation for the redshift-distance relationship. These models have been proposed as alternatives to th
Fritz Zwicky
…of Sciences, 15 (10): 773–779, Bibcode:1929PNAS...15..773Z, doi:10.1073/pnas.15.10.773, PMC 522555, PMID 16577237. This is the article that proposes a tired light model to explain Hubble's law. (full article) Baade, W.; Zwicky, F. (1934), "On Super-novae", Proceedings of the National Academy of Sciences, 20 (5…
The Hubble Ultra Deep Field is an image of galaxies that are in excess of 10 billion light years away. If tired light was a correct explanation, these galaxies would appear blurred in comparison to closer galaxies. That they do not rules out the suggestion that scattering processes are causing the redshift-distance relation.