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Leavitt discovers 2400 Cepheid variable stars and develops her period-luminosity theory (1 janv. 1902 – 1 janv. 1908)
Ajouté au bande de temps:
23 janv. 2018
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big history project timeline
Henrietta Leavitt, and Edwin Hubble.
Date:
1 janv. 1902
1 janv. 1908
~ 6 years
