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MATH PUZZLE: Can you replace the question mark with a number?

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.

A complete idiot

I'm not a complete idiot….Some parts are missing.
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