Image: Karl Schwarzschild and Ejnar Hertzsprung (1909)
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Description: Karl Schwarzschild (left) and Ejnar Hertzsprung in professorial gowns in front of the Göttingen Observatory building sometime in 1909.
Title: Karl Schwarzschild and Ejnar Hertzsprung (1909)
Credit: http://www.leosondra.cz/en/first-hr-diagram/
Author: The Göttingen Observatory photo, courtesy Hartmut Grosser.
Usage Terms: Public domain
License: Public domain
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