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The Reading Room · Jun 21, 2026

Almost Certainly Not Real

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She was right. He got the credit.

In 1925, a twenty-five-year-old graduate student calculated that the Sun is made almost entirely of hydrogen.

Her supervisor told her the finding was “clearly impossible.”

She believed him.

She added a line to her own thesis calling her own discovery “almost certainly not real.”

Four years later, Henry Norris Russell reached the same conclusion using a different method.

The field gave him the credit.

Tuesday we talk about Cecilia Payne-Gaposchkin — the woman who figured out what stars are made of, and was talked into doubting her own genius.


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