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September 30, 2021
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Astronomy
Created by
rhiannon ho
⟶ Updated 10 Dec 2018 ⟶
List of edits
Timelines by
rhiannon ho
:
7 Mar 2018
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198
Italian Unification
timeline
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Events
Aristarchus proposes heliocentric system
Isaac Newton expains gravity
William Herschel discovers uranus
Friedrich Bassel discovers parrallax
John Couch Adams discovers Neptune
Georges Lemaitre proposes big bang
edwin hubble finds evidence of the galaxy expanding
clyde tombaugh disovers pluto
Arno Penzias and rober wilson discover cosmic micorwave background radiation
International astronomical union declares pluto is not a planet
