Fr Georges Lemaître, the Priest Who Discovered the Big Bang
British priest and Oxford physicist Fr Andrew Pinsent shares this amazing post about the origin of the Universe and a stunning connection that struck close to home.
September 1, 2021
Note from Father Gordon MacRae: I am honored to present this guest post by Father Andrew Pinsent, Research Director of the Ian Ramsey Centre for Science and Religion at Oxford University. Formerly a physicist at CERN, Father Andrew now also serves on the Faculty of Theology at Oxford. Father Andrew holds a doctorate degree in particle physics from Oxford, a doctorate in philosophy from St. Louis University, and advanced degrees in theology from the Pontifical Gregorian University in Rome. He is a member of the United Kingdom Institute of Physics, the author of many publications on science and faith, and has appeared on BBC news, EWTN, and at the Vatican conference for scientists.
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Why should anyone be interested in Fr Georges Lemaître? Here’s one reason. Being both a priest and a former particle physicist at CERN, I am often asked to give talks on faith and science. Quite often young people ask me the following question, “How can you be a priest and believe in the Big Bang?” To which I am delighted to respond, “We invented it! Or more precisely, Fr Georges Lemaître invented the theory that is today called the “Big Bang” and everyone should know about him.”
Here is a little of the historical background. The Belgian priest-astrophysicist Fr Georges Lemaître in 1927 published a paper in the Annals of the Scientific Society of Brussels presenting the idea of an expanding universe. When invited to a meeting of the British Association in London in 1931, on the subject of science and religion, Fr Lemaître proposed that the universe had expanded from an initial point, which he called the ‘Primeval Atom’. In 1949, the astronomer Fred Hoyle described Fr Lemaître’s theory as a ‘Big Bang’. Shortly before Fr Lemaître died in 1966, he learned of the discovery of cosmic microwave background radiation, widely interpreted today as the faint echo of the Big Bang itself. With some modifications, the Big Bang has today become our standard grand narrative for understanding the cosmos.
Given that this history is incontrovertible (see, for example, Helge Kragh, Cosmology and Controversy (Princeton, N.J.: Princeton University Press, 1996)), why then do young people still ask me, “How can you be a priest and believe in the Big Bang?” Many answers could be given in particular cases, but the underlying reason, I think, is that there is another kind of grand narrative at work. Part of that narrative today, absorbed from at least the age of ten in schools and from the media, is that faith is opposed to reason, and the Catholic Church in particular is opposed to science. The fact that a Catholic priest invented the Big Bang theory is therefore what might be called an ‘inconvenient truth’, something that cannot happen and therefore, for all intents and purposes, did not happen. More subtly, some people acknowledge Fr Lemaître’s achievement but deny that any significant implications can be drawn for understanding the relation of faith and science. They point out that his scientific work was distinct from his priesthood or that he is a ‘black swan’ event from which no wider conclusions can be drawn.
Such criticisms, however, overlook the value of the negative conclusion, namely that faith and revolutionary brilliance in science were clearly not incompatible in Fr Lemaître’s life, and perhaps that there are more ‘black swans’ waiting to be rescued from neglect. Moreover, even an appreciation of the extent to which Fr Lemaître is overlooked can serve as a catalyst for a broader re-examination of cultural prejudices regarding faith and science. For example, did the Catholic Church oppose the Big Bang theory? Was Fr Lemaître exiled or disgraced? No! Fr Lemaître was honoured by the Pope, who appointed him to the Pontifical Academy of Sciences in 1936. Did atheists welcome the Big Bang theory? No, or at least many did not for a surprisingly long time! As late as 1948, at a meeting in Leningrad, Soviet astronomers affirmed the need to fight against the ‘reactionary-idealistic’ theory of a ‘primeval atom,’ (i.e. the Big Bang) support for which, it was claimed, would help ‘clericalism’ (see Kragh, p. 262).
Such opponents saw, perhaps more clearly than we do today, that although aspects of the cosmos can be modelled by mathematics, to consider the formation and evolution of the cosmos as a whole requires taking up a God-like perspective in our imaginations, an implicitly hazardous prospect (at least at first) for the materialist or physicalist. Furthermore, to explore the origins, structure and evolution of the cosmos with the expectation of discerning knowable order is a habit born out of patterns of thinking shaped over centuries by the revelation of a Creator God of reason and love. As early as the first Christian century, we find, for example, Pope St Clement I referring to the sun, moon, and stars being “…put in motion by his [God’s] appointment … in harmony and without any violation of order …” (Epistle of Pope Clement I to the Corinthians, 19:2 - 20:12 (trans. C. Hoole)), a narrative of order and love that has shaped the expectations of our culture regarding the possibility and value of cosmology.
What, then, is to be done to help raise the profile of people like Fr Georges Lemaître? Among Catholics with some kind of popular outreach, Fr Gordon MacRae through his widely-read blog BTSW has done more than almost anyone I know in recent years to draw attention to Fr Lemaître. Inspired in part by Fr Gordon’s work, my colleagues and I in England have now put together some high quality laminated A3 posters that we can send worldwide in a series called the “Catholic Knowledge Network”. A copy of the A3 poster for Fr Lemaître is shown at the bottom of this post. If you would like to purchase these beautiful posters (for education institutions, parish halls, classrooms, and other public spaces), please do so from our publisher, the Catholic Truth Society in London, from where they can be sent worldwide.
As a regular reader of Beyond These Stone Walls and a contributor to Fr Gordon’s legal defense fund, I thank him for this opportunity and for the remarkable worldwide impact of his blog. I also thank those who edit and maintain this blog on his behalf.
Fr Andrew Pinsent
Theology and Religion Faculty
Oxford University
Two Phenomenal Postscripts from Fr Gordon MacRae
I am indebted to Father Andrew Pinsent for the above post. After he wrote it, I came across two discoveries related to it that I thought were phenomenal. The first is an excerpt from Einstein’s Heroes: Imagining the World Through the Language of Mathematics (Oxford University Press, 2005), a wondrous book by a brilliant mathematician, Robyn Arianrhod:
“In 1931, [Georges] Lemaitre formally sowed the seeds of the Big Bang theory when he suggested the universe had started as an explosion of a ‘primeval atom,’ and that it had continued expanding from that explosive beginning .... [From] Einstein’s equation [he] predicted the universe had expanded not from a tiny piece of matter located in an otherwise empty cosmos, but from a single point in four-dimensional space-time .... Before this point, about thirteen billion years ago, there was no time and no space. No geometry, no matter, nothing. The universe simply appeared out of nowhere. Out of nothing.”
“The Universe simply appeared out of nowhere. Out of nothing.” This is the conclusion of modern cosmology that began with the work of another brilliant mathematician-physicist, Fr. Georges Lemaître. If you wonder about the relevance of faith in the scientific world, you may be surprised to learn that science is using some of the same concepts as the Catechism of the Catho1ic Church to describe the origin of a created universe:
“God created the universe out of nothing.” — CCC 290
“We believe that God needs no pre-existent thing or any help in order to create. God created freely out of nothing." — CCC 296
“God said, ‘let there be light,’ and there was light” (Genesis 1:4). Scripture bears witness to faith in creation ‘out of nothing’ as a truth filled with promise and hope.” — CCC 297
“Since God created everything out of nothing, He can also, through the Holy Spirit, give spiritual life to sinners by creating a pure heart in them, and bodily life to the dead through the Resurrection.” — CCC 298
As Father Andrew Pinsent described, the cosmic background radiation left by the Big Bang was first detected and identified in 1965 by American astrophysicists, Arno Penzias and Robert Wilson. Father Lemaître died one year later having witnessed the final acceptance by science of the truth of his discovery about the origin of the created universe.
Between 1989 and 1993, NASA’s Cosmic Background Explorer (COBE) spacecraft mapped the cosmic background radiation. It verified that the distribution of intensity of the background radiation precisely matched that of matter that emits radiation because of its temperature, as also predicted by Father Lemaître’s Big Bang theory. For the science of cosmology, the created universe, which Father Georges Lemaître said began ‘On a Day without Yesterday,’ is no longer a theory. I hope you will read anew and share my first post about the Father of the Big Bang and Modern Cosmology, “A Day Without Yesterday: Fr Georges Lemaître and the Big Bang.”
My second postscript to Father Andrew Pinsent’s article above is more personal, but just as phenomenal. After we both posted our respective articles about Father Georges Lemaître, I received a letter from Belgium where Father Lemaître had long ago taught at the University of Louvain. The letter was written from Pornchai Moontri’s Godfather, Pierre Matthews, who read both posts. His letter revealed something astonishing, something that seems as much the work of the Hand of God as the Big Bang itself.
It turns out that Fr Georges Lemaître, Father of the Big Bang and modern cosmology, was the Godfather of Pornchai Moontri’s Godfather. The photograph above depicts Pierre’s family with Fr. Lemaître and his mother on holiday at Lake Luzern, Switzerland. That’s 14-year-old Pierre just behind and to the left of Father Lemaître. Pierre’s sister and mother are to the right of Father Lemaître’s mother. In his letter with the photo Pierre wrote:
“My mother and Fr. Lemaître were both born in the same little town, Marcinelle, in Belgium. My maternal grandparents and Fr. Lemaître’s parents were close friends so my mother grew up with Georges Lemaître. He was as an uncle to me. In the summer of 1954, as the photo depicts, we spent four weeks together at the shore of Lake Luzern, Switzerland. I thought you and Pornchai might like to have this photograph.”
It was the understatement of the year. Pierre Matthews passed away in 2020 just as his Godson, Pornchai, regained his freedom.
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Note from Father Gordon MacRae: I don’t know about you, but I needed a break from all the drama of my last several posts. Thank you for reading Fr Andrew Pinsent’s guest post and my postscript. They will be placed in our newest BTSW Library category, “Science and Faith.”
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“A Day Without Yesterday:” Fr Georges Lemaitre and the Big Bang
Father Andrew Pinsent
