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AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
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1 ene 1912 año - Publishes a table of 25 different Cepheid variable periods.
Añadido al timeline:
Henrietta Leavitt
By
Shawn Cunning
2 oct 2018
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499
fecha:
1 ene 1912 año
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~ 113 years ago
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