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26 dic 1911 año - Hubble started measuring the Doppler shift of spectral lines from spiral nebulae

Descripción:

https://www.atnf.csiro.au/outreach/education/senior/cosmicengine/hubble.html

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Theories Timeline Assignment

19 nov 2019

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fecha:

26 dic 1911 año

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~ 113 years ago

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