Henry Norris Russell (October 25, 1877 – February 18, 1957) was an American astronomer who, along with Ejnar Hertzsprung, developed the Hertzsprung–Russell diagram (1910). In 1923, working with Frederick Saunders, he developed Russell–Saunders coupling which is also known as LS coupling. In 1925, he persuaded graduate student Cecilia Payne not to state, in her Ph.D. thesis, her seminal conclusion that the Sun was of a different composition from the Earth. Later, he accepted the conclusion and is often credited with the discovery.
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