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Mount Wilson system of spectral classification

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  • Russell , Henry Norris — (1877–1957) American astronomer Russell, the son of a Presbyterian minister, was born in in Oyster Bay, New York. A brilliant scholar at Princeton, he graduated in 1897 and obtained his PhD in 1899. He spent the period 1902–05 as a research… …   Scientists

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  • Cosmic distance ladder — * Light green boxes: Technique applicable to star forming galaxies. * Light blue boxes: Technique applicable to Population II galaxies. * Light Purple boxes: Geometric distance technique. * Light Red box: The planetary nebula luminosity function… …   Wikipedia

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