Relation between magnitudes and spectral types of stars studies by Ejnar Hertzsprung and Henry Russell

Ejnar Hertzsprung (8th October, 1873 - 21st October, 1967), a Danish chemist and astronomer, and Henry Norris Russell (25th October, 1877 - 18th February, 1957), an American astronomer, developed the Hertzsprung-Russell diagram in 1910. Hertzsprung-Russell diagrams show the relationships and. . .

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