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12/12/1921 A woman who measured the universe dies

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Henrietta Leavitt & the Human Computers: Great Minds

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Who is Henrietta Swan Leavitt? | DNews

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Henrietta Leavitt: Unsung Heroine in Science

American astronomer Henrietta Swan Leavitt discovered the relationship between the luminosity and the period of Cepheid variable stars. It allowed astronomers to measure the distance between the Solar system and faraway galaxies. Edwin Hubble later used it to prove that the universe is expanding.
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