Cosmology
Lemaitre studies relativistic cosmology and begins work that will connect general relativity to cosmic expansion
Astronomer profile · World History Database
Georges Lemaître
Georges Lemaître was a Belgian physicist, priest and cosmologist who applied general relativity to the universe as a whole. In the 1920s he developed expanding-universe solutions and connected them with astronomical observations.
Why Georges Lemaître matters in astronomy
Lemaître later proposed that the universe developed from an extremely dense early state, an important precursor of modern Big Bang cosmology. His work connected theoretical physics with the new observational study of galaxies.
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Lemaître, GeorgesName2, Name1 format
Georges Lemaître timeline in the database
Universe Expansion
The expansion of the Universe accellerates as it expands
Expanding Universe
Lemaitre derives an expanding universe model from general relativity and estimates an expansion rate
Expanding Universe with Lambda
Lemaitre develops an expanding relativistic universe in which the cosmological constant can influence the large-scale evolution of cosmic expansion.
Hubble-Lemaitre Law
Lemaitre derives an expanding universe model and estimates the expansion rate from galaxy distances and velocities
Primeval Atom
Lemaitre proposes a primeval atom origin for the expanding universe within relativistic cosmology
Primeval Atom
Lemaitre proposes that the universe expanded from a primeval atom, an early form of Big Bang theory
Primeval Atom
Lemaitre lectures in the United States on the expanding universe and his primeval atom hypothesis
Vacuum Energy Interpretation
Lemaitre relates the cosmological constant to an energy density of empty space, anticipating the modern vacuum-energy interpretation of dark energy.
Related astronomy topics
Sources and editorial provenance
Compiled and edited by World History Database
Historical chronology compiled from the World History Database and checked against major scientific and historical reference sources.
Last reviewed: September 2026.
- Royal Museums Greenwich — History of astronomy
- Royal Museums Greenwich — History of the telescope
- NASA Science — Hubble timeline
- NASA Science — Exoplanet discovery history
- LIGO — GW150914 first gravitational-wave detection
- Event Horizon Telescope — first black-hole image
- NASA Webb — mission science and discoveries