A Hertzsprung-Russell diagram
Science & Exploration

21 October

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ESA / Science & Exploration / Space Science

1967: On 21 October 1967, Ejnar Hertzsprung died.

Hertzsprung was a Danish astronomer who classified types of stars by relating their surface temperature (or colour) to their absolute brightness.

A few years later 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.

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