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Jack Sone

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Ejnar Hertzsprung

Died 21 Oct 1967 at age 94 (born 8 Oct 1873). Danish astronomer who classified types of stars by relating their surface temperature (or colour) to their absolute brightness. A few years later Henry Russell illustrated this relationship graphically in what is now known as the Hertzsprung-Russell diagram, which has become fundamental to the study of stellar evolution. In 1913 he established the luminosity scale of Cepheid variable stars.

I'M NO BIRD EXPERT...

I'M NO BIRD EXPERT BUT I'M GUESSING 4 FEMALES AND 1 MALE
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