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dec 26, 1911 - Hubble started measuring the Doppler shift of spectral lines from spiral nebulae
Description:
https://www.atnf.csiro.au/outreach/education/senior/cosmicengine/hubble.html
Added to timeline:
Theories Timeline Assignment
By
Ben CLIFFORD
19 Nov 2019
0
0
375
Date:
dec 26, 1911
Now
~ 113 years ago
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