Alikuwa mtaalamu wa kwanza aliyependekeza kwamba ulimwengu unapanuka na chanzo chake kilikuwa katika nafasi ndogo sana iliyopanuka ikiendelea kupanuka hadi leo. Aliita hali ya mwanzo "atomu asilia" (ing. primeval atom) ambamo nishati na masi yote ya ulimwengu zilikuwepo tayari.
Hivyo aliweka msingi wa nadharia ya mlipuko mkuu[3]. Aligundua pia kanuni zilizotangazwa miaka miwili baadaye na Edwin Hubble na kujulikana kama "Kanuni za Hubble" (Hubble's law na Hubble constant)[4][5][6][7][8][9]).
G. Lemaître, Discussion sur l'évolution de l'univers, 1933
G. Lemaître, L'Hypothèse de l'atome primitif, 1946
G. Lemaître, The Primeval Atom - an Essay on Cosmogony, D. Van Nostrand Co, 1950.
"The Primeval Atom," in Munitz, Milton K., ed., Theories of the Universe, The Free Press, 1957.
Lemaître, G. (1927). "Un univers homogène de masse constante et de rayon croissant rendant compte de la vitesse radiale des nébuleuses extragalactiques". Annals of the Scientific Society of Brussels (kwa Kifaransa). 47A: 41.{{cite journal}}: Invalid |ref=harv (help)
(Translated in: "A Homogeneous Universe of Constant Mass and Growing Radius Accounting for the Radial Velocity of Extragalactic Nebulae". Monthly Notices of the Royal Astronomical Society. 91: 483–490. 1931. Bibcode:1931MNRAS..91..483L. doi:10.1093/mnras/91.5.483.{{cite journal}}: Invalid |ref=harv (help))
Holder, Rodney; Mitton, Simon (2013). Georges Lemaître: Life, Science and Legacy (Astrophysics and Space Science Library 395). Springer. ISBN3642322530.
Berenda, Carlton W (1951). "Notes on Lemaître's Cosmogony". The Journal of Philosophy. 48 (10).
Berger, A.L., editor, The Big Bang and Georges Lemaître: Proceedings of a Symposium in honour of G. Lemaître fifty years after his initiation of Big-Bang Cosmology, Louvain-Ia-Neuve, Belgium, 10–13 October 1983 (Springer, 2013).
Cevasco, George A (1954). "The Universe and Abbe Lemaitre". Irish Monthly. 83 (969).
Godart, Odon & Heller, Michal (1985) Cosmology of Lemaître, Pachart Publishing House.
Farrell, John, The Day Without Yesterday: Lemaître, Einstein and the Birth of Modern Cosmology (Basic Books, 2005), ISBN978-1560256601.
Lambert, Dominique, The Atom of the Universe: The Life and Work of Georges Lemaître (Copernicus Center Press, 2015), ISBN978-8378860716.
McCrea, William H. (1970). "Cosmology Today: A Review of the State of the Science with Particular Emphasis on the Contributions of Georges Lemaître". American Scientist. 58 (5).
Kragh,Helge(1970)."Georges Lemaître".InGillispie, Charles.Dictionary of Scientific Biography.New York:Scribner & American Council of Learned Societies.pp.542–543.ISBN978-0-684-10114-9
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