Editing 1924 in science (section)

==Astronomy and space exploration==
[[File:Andromeda Galaxy (with h-alpha).jpg|thumb|[[Andromeda Galaxy]]]]
* November 23 – [[Edwin Hubble]] announces his discovery that [[Andromeda Galaxy|Andromeda]], previously believed to be a [[nebula]], is actually another [[galaxy]], and that the [[Milky Way]] is only one of many such galaxies in the universe.<ref>In ''[[The New York Times]]''. {{cite book|last1=Sharov|first1=Aleksandr Sergeevich|last2=Novikov|first2=Igor Dmitrievich|title=Edwin Hubble, the discoverer of the big bang universe|url=https://books.google.com/books?id=ttEwkEdPc70C&pg=PA34|accessdate=2011-12-31|year=1993|publisher=Cambridge University Press|isbn=978-0-521-41617-7|page=34}} Formally published December 30 and presented as a paper at the January&nbsp;1, 1925 meeting of the [[American Astronomical Society]]. {{cite book|title=The Day We Found the Universe|first=Marcia|last=Bartusiak|publisher=Random House|year=2010|pages=x–xi|url=https://books.google.com/books?id=7XojzXh4_KEC&q=The+Day+We+Found+the+Universe|isbn=9780307276605}}</ref>
* The [[Einstein Tower]] near [[Potsdam]], [[Germany]], designed by [[Erich Mendelsohn]], becomes operational as an astrophysical observatory.
* [[Mount Stromlo Observatory]] near [[Canberra]], Australia, is established as the Commonwealth Solar Observatory.
* [[1056 Azalea]] is discovered.