
The Thomistic Institute George Lemaitre: The Catholic Priest Who Proposed the Big Bang Theory – Prof. Jonathan Lunine
Nov 12, 2025
In this enlightening discussion, Prof. Jonathan Lunine, Chief Scientist at NASA’s JPL and Professor at Caltech, delves into the remarkable life of Georges Lemaître, the Catholic priest who proposed the Big Bang theory. He explores how Lemaître's faith and science intertwined, challenging misconceptions about their conflict. Lunine uncovers Lemaître’s groundbreaking ideas on cosmic expansion and the implications of the primeval atom. He also emphasizes Lemaître’s belief in two paths to truth, advocating for the harmony between science and religion.
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Conversion Led To Surprising Scientist Encounters
- Jonathan Lunine recounts discovering many successful scientists who are also Catholic after his conversion.
- He highlights Georges Lemaître as an outstanding example of a faithful priest and top-tier scientist.
Priest And Premier Cosmologist
- Lemaître combined priesthood with cutting-edge research in general relativity and cosmology.
- He studied under Eddington, earned a PhD at MIT, and taught at Louvain while remaining an active priest.
Static Universe Versus Relativity
- Early 20th-century cosmology assumed a static, eternal universe, which conflicted with general relativity.
- Einstein introduced the cosmological constant to force a static solution, revealing tensions between theory and observation.


