Alexander Friedman, Soviet cosmologist

Alexander Friedman, Soviet cosmologist

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Credit: SPUTNIK/SCIENCE PHOTO LIBRARY

Caption: Alexander Alexandrovich Friedman (1888-1925), Russian and Soviet cosmologist and mathematician. Friedman, who lived and worked in Leningrad, is considered the founder of modern cosmology. After World War I, in 1922, he found a solution to Einstein's general relativity equations that indicated an expanding universe, a prediction famously confirmed by Edwin Hubble's observations in 1929. Friedman, though, had died in 1925 after contracting typhoid fever. Friedman's other interests included hydrodynamics and meteorology. In July 1925, he had participated in a balloon flight to an altitude of over 7 kilometres. Photographed in Russia in 1920.

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