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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INSIGHT

Primeval Atom And Cosmic Beginning

  • Lemaître inferred that running expansion backward implies a radically different initial state he called the 'primeval atom.'
  • He proposed the universe had a temporal beginning distinct from later physical laws.
ANECDOTE

‘Big Bang’ Nickname Origin Story

  • Fred Hoyle mockingly coined 'Big Bang' to deride Lemaître's model and linked it to religious motives.
  • Hoyle and others used Pope Pius XII's remarks to claim the model was faith-driven rather than scientific.
INSIGHT

CMB Confirmed The Big Bang

  • The Big Bang predicted a cooled relic of early hot radiation, the cosmic microwave background.
  • The 1960s detection by Penzias and Wilson validated the Big Bang and vindicated Lemaître's model.
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