Henry Norris Russell

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Noun1.Henry Norris Russell - United States astronomer who developed a theory of stellar evolution (1877-1957)Henry Norris Russell - United States astronomer who developed a theory of stellar evolution (1877-1957)
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In 1899 Princeton astronomer Henry Norris Russell correctly attributed cusp extensions to sunlight scattered by exceedingly fine particles suspended in a transparent layer of atmosphere just above the planet's opaque canopy of clouds.
En 1911 Ejnar Hertzsprung y Henry Norris Russell establecen la relacion entre la luminosidad y el color de las estrellas, y la expresan como una sucesion, conocida como Diagrama de Hertzsprung-Russell.
Conversely, the stars and the Sun display signs of extreme hydrogen abundance, as first observed by Cecilia Payne [8], Albrecht Unsold [9], and Henry Norris Russell [10].
Independently, the American astronomer Henry Norris Russell (1877-1957) noted this in 1914.