1924 in science

The year 1924 in science and technology involved some significant events, listed below.

Astronomy and space exploration

November 23 – Edwin Hubble announces his discovery that 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.
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.

The term "ectogenesis" is coined by British scientist J. B. S. Haldane to describe the growth of mammalian embryos in artificial environments.
California grizzly bear last sighted.

The first inactive tetanus vaccine is discovered by Gaston Ramon, C. Zoeller and P. Descombey and produced.
The first scarlet fever vaccine is discovered by George F. Dick and Gladys Dick.

December 17 – Dismantling of James Watt's workshop for display in the Science Museum, London, commences.

October – The first specimen of Australopithecus africanus, the fossil skull of the "Taung Child", is identified in South Africa.

S. N. Bose and Albert Einstein publish papers in Zeitschrift für Physik applying Bose–Einstein statistics to light quanta and to atomic models and predicting existence of the Bose–Einstein condensate.
E. C. Stoner publishes a paper pointing out that for a given value of the principal quantum number, the number of energy levels of a single electron in the alkali metal spectra in an external magnetic field, where all degenerate energy levels are separated, is equal to the number of electrons in the closed shell of the rare gases for the same value of n. This leads to discovery of the Pauli exclusion principle which Wolfgang Pauli first proposes in a letter at the end of the year.
Louis de Broglie introduces the wave-model of atomic structure, based on the ideas of wave–particle duality.

February – Li Xintian, Chinese neuropsychologist
February 21 – Thelma Estrin, American computer scientist and biomedical engineer
March 2 – Michael Sela, Polish-born Israeli immunologist
March 11 – Franco Basaglia, Italian psychiatrist
March 12 – Mary Lee Woods, English mathematician and computer programmer
March 23
* Bjørn G. Andersen, Norwegian quaternary geologist and glaciologist
* Olga Kennard, English crystallographer
May 3 – Isadore Singer, American mathematician
May 7 – James Learmonth Gowans, British immunologist
May 11 – Antony Hewish, English radioastronomer
June 11 – César Lattes, Brazilian experimental physicist
June 24 – James W. Black, Scottish pharmacologist
July 8 – Robert M. Chanock, American pediatrician and virologist
July 15 – David Cox, English statistician
August 1 – John Clive Ward, English-born physicist working in quantum electrodynamics
September 10 – Elizabeth Killick, English naval electronics engineer
September 22 – Laurel van der Wal, American aeronautical engineer
September 26 – Jean Hoerni, Swiss-born microelectronics engineer
November 9 – Don Beaven, New Zealand medical researcher in the area of diabetes treatment and prevention
November 20 – Benoît Mandelbrot, Polish-born French American mathematician, originator of fractal geometry
December 30 – Yvonne Brill, Canadian scientist best known for her work developing rocket and jet propulsion technologies