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Not as a demonstrated natural law, but as a working hypothesis. ↗
#hypothesis #law #natural #working
Boston 1926–27 1938 1945). Soc.
Henry Norris Russell (1937).
Henry Norris Russell (October 25 1877 – February 18 1957) was an American astronomer who along with Ejnar Hertzsprung developed the Hertzsprung–Russell diagram (1910).