Science and Faith Are Not Mutually Incompatible

Albert Einstein honored Georges Lemaitre, the priest, physicist and mathematician whose Big Bang Theory is now the scientifically accepted origin of the universe.

March 11, 2026 by Father Gordon MacRae

In 2016, an issue of the former Catholic newspaper Our Sunday Visitor profiled some eye-opening research in an article entitled “Young People Are Leaving the Faith: Here’s Why” (August 27, 2016). It was an analysis of two national studies conducted by The Center for Applied Research in the Apostolate (CARA) to provide insight into the reasons why a third of “millennials” who were raised Catholic reject the faith of their parents as young adults.

In the CARA studies, “Millennials” are defined as those born in 1982 or later. The majority of the young adults who responded with comments on the research indicated that they left their faith for science, concluding that Catholicism cannot be reconciled with science at the high school and university level. They report finding little in the Catholic presentation of faith that challenges that view. The OSV  summary included a sampling of the responses behind their decisions:

“As I learn more about the world around me and understand things that I once did not, I find the thought of an all-powerful being to be less and less believable.”

“Catholic beliefs aren’t based on fact… nothing can be disproved, but it certainly shouldn’t be taken seriously.”

“I realized that religion is in complete contradiction with the rational and scientific world, and to continue to subscribe to a religion would be hypocritical.”

“As I started to enjoy math and science more, I realized the discrepancy between religion and science… Catholicism especially did seem to clash fairly well.”

“[Faith] no longer fits into what I understand of the universe.”

These responses reflect a pattern of thought familiar to many parents of young adult Catholics and others concerned about the dismal conclusions of the CARA research. This is also one of the most common pleas I hear on a global scale from parents and grandparents and other readers of this blog.

I must seem to be an enigma to those who have left our faith or are pondering doing so. Judging from my posts of the last ten years, though it was never intended to be so, I seem to devote almost equal time to both faith and science. For example, we have recently collected in one place a number of posts dedicated to the understanding of Sacred Scripture. We called this collection, “The Bible Speaks.” Apparently it speaks quite loudly. There are presently some 43 titles in that collection, and some have broken records among the readership of this blog.

But there is a similar phenomenon that has been taking place in more recent years. I have also written several posts about science and especially the sciences of cosmology, astronomy and particle physics. One of my friends here who comes to the library where I work has asked me for copies of posts over the last few years. He recently complained of feeling a sense of whiplash, bouncing between science and religion, but he said he finds both to be fascinating. To demonstrate this phenomenon one recent post has broken all records in numbers of readers and especially in numbers of readers who come to it again and again, and who share it. That post is “Did Stephen Hawking Sacrifice God on the Altar of Science?” It seems that many people believed that he did, but I have made a case for the opposite. What strikes me most about that post is the unfathomable number of educational institutions of higher learning that are also sharing it and recommending it.

The same has held true for another recent post that blends principles of both science and faith entitled “The Higgs Boson God Particle: All Things Visible and Invisible.” Our Editor has observed and commented on the high number of academic institutions that have also been visiting religious titles on this blog. Some of these institutions are dedicated to scientific research, and yet here they are suddenly delving into the mysteries of Catholic faith. And yet no one is denouncing anything. They seem to come here to observe and to learn, not to refute.

True Believers

I have some firsthand experience with the challenging questions posed by science for the faith of younger Catholics. A decade ago at one university, the son of a reader of this blog, a science major, sent me a letter filled with questions. The previous summer, his mother had emailed him with a link to one of my forays into the science of cosmology entitled, “Science and Faith and the Big Bang Theory of Creation.” In his letter to me the student wrote that he pretty much just dismissed the post as irrelevant without having read it. He read his mother’s email, but didn’t bother clicking on the link until two months later. The student wrote that he grew up in a devout family that accepted Catholic teachings about the world and universe without question. He attended Catholic schools until switching to a public high school, then abandoned his faith in adolescence because his interest in science made faith seem irrelevant.

He believed, or rather was led to believe, that science and religion are mutually incompatible, unable to coexist in a person of science. “The bias fed to me in academia,” he wrote in a much later letter, “was that science is the new source of all faith, and to be taken seriously as a scientist requires setting aside the faith of my parents in this new world order.” And thus ended his identity as a Catholic. It is a troubling story given that for every convert entering the Catholic faith in America in recent years, more than six others left.

The exit of millennials is not at all for the reasons typically put forward by older Catholics who become disenchanted with their Church. In the CARA study, Catholic scandal and the Latin Mass are barely touched upon as influential reasons. And the millennials are not leaving to embrace some other faith. They now constitute the fastest growing expression of religious belief in America — the “Nones,” who self-identify with no religious affiliation at all. A decade ago in “A Crisis of Faith, Not of Worship,” a soul-stirring post at The Catholic Thing, (Aug. 24, 2016) Father Mark A. Pilon made this point well:

“The real underlying problem is simple: it’s a massive loss of faith… About thirty years ago, a reliable survey revealed that only about 30 percent of Catholics believed in the Real Presence of Christ in the Eucharist any longer. Why didn’t the bishops call an emergency meeting to reflect on this loss of faith, as they did in 2002 to deal with sexual abuse? … The highest priority has to be this basic question: What caused this massive loss of faith, and how do we work to resurrect that lost faith?”

These are very relevant questions, but some have already begun to change. In early 2025 I wrote a post entitled “On the Great Biblical Adventure, the Truth Will Make You Free.” Something happened over the preceding year that signaled a great cultural change toward openness to religion and especially biblical studies. Book publishers have observed that Bible sales greatly increased by double digits toward the end of 2024. A lot of factors were proposed as contributing to this, including the election of 2024, the assassination attempts on the leading U.S. presidential candidate at that time, and later the assassination of Charlie Kirk, founder of Turning Point USA. These were inflection points causing broad swaths of America and elsewhere in the free world to pause and reassess where we are and where we are going. The biblical interest and its resulting growth of interest in faith also has continued to this day. For those who have suggested that Catholic leaders need to take advantage of this trend, a good start would be to moderate “climate change” as an example of our highest priority while abandoning other priorities, such as respect for life. Our hierarchy might also want to reconsider its revulsion for the Traditional Latin Mass and for those who find spiritual comfort in it, many of whom are younger Catholics. And a prohibition against kneeling to receive the True Presence of Christ is simply mind-boggling for true believers. We cannot welcome back a generation of young believers by browbeating them to abandon the evidence for their belief.

The Folly of Leaving Faith Behind for Science

The answer to the suspected disconnect between science and faith is not as simple as seeking relevancy by replacing faith with science. True believers in both find not only “common ground” but windows to the universe that will leave the believer in awe. The student who had been writing to me, for example, is now on his way back. As time wore on, his mother asked him what he thought about the post she sent him. He scurried to find “Science and Faith and the Big Bang Theory of Creation” buried in his inbox, and then he actually read it.

He later wrote that he was “bowled over” by it, and that it turned on its head the entire scientific orthodoxy that had been fed to him claiming that only freedom from religion could legitimately engage him with the world of science. Science with a bias against faith experience prevented him from seeing the bigger picture.

This student had many questions. First and foremost among them was this: “How is it that you, a person obviously well versed in science, could endure such injustice and still also believe in God?” It was a good question, but the answer requires something other than science’s doubts about faith. A better beginning question was the one I posed in return: “How is it that you, a science major in an American university, never before heard or read that the scientist now considered to be the Father of The Big Bang and Modern Cosmology was a Belgian astrophysicist who was also a Catholic priest?”

That question generated several letters over the last two years, suggesting BTSW posts that he has read and reread and shown to other science majors at his school. Before I get into that, however, I want to describe another development that I read some years ago by Beckie Strum in The Wall Street Journal: “U.S. Loses Top School Ranking to U.K.’s Oxford” (WSJ, Sept. 22, 2016).

For the first time, a university outside the United States was ranked the best university in the world, unseating the California Institute of Technology (Caltech) as number one. The U.K.’s Oxford University, the oldest college in the English speaking world, founded in the year 1096, took the top spot in the World University Rankings. Oxford knocked CalTech down to second place, MIT to fifth, and Harvard to sixth bin 2016. At this writing, Oxford has retained that place of primacy for a decade.

Oxford is also host to something missing from more narrowly focused American universities. Oxford is home to a research center called the Ian Ramsey Center for Science & Religion. Its Research Director at the time was Father Andrew Pinsent, a Catholic priest and particle physicist who was formerly on the science team at CERN, the European Council for Nuclear Research.

Father Andrew Pinsent holds a Ph.D. in particle physics from Oxford, a Ph.D. 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 and the Vatican Conference for Scientists, and presently serves on the faculty and formation staff of a major U.S. seminary.

Father Pinsent has also been a guest writer at this blog. His post, “Fr Georges Lemaître, the Priest Who Discovered the Big Bang” was the final leverage that my university friend and correspondent needed to accept the fact that something essential has been missing from his education and exposure in both science and religion. The fact that his science education did not include the story of Georges Lemaitre — the astronomer, mathematician, physicist, and Catholic priest who changed the mind of Albert Einstein on the nature and origin of the universe — told him that it was science, and not faith, that deprived him of a wider world view.

This is a story that has been covered and uncovered at Beyond These Stone Walls  in a series of science posts that has run parallel to our collection on Sacred Scripture. Reading these, and especially exploring Father Pinsent’s work, has opened my friend’s eyes as a young Catholic scientist, but it was a part of Father Andrew Pinsent’s guest post that more fully opened my own eyes when he wrote:

“What is to be done to help raise the profile of people like Fr Georges Lemaitre? Among Catholics with some kind of popular outreach, Fr Gordon MacRae, through his widely-read blog Beyond These Stone Walls, has done more than almost anyone I know in recent years to draw attention to Fr Lemaitre. Inspired in part by Fr Gordon’s work, my colleagues and I in England have put together a series of posters called the “Catholic Knowledge Network.”

— Fr Andrew Pinsent, “Fr Georges Lemaître, the Priest Who Discovered the Big Bang”

I think I have come to understand Father Georges Lemaitre’s science whose footprint in the history of modern cosmology is parallel to that of Albert Einstein. They were colleagues who became friends, primarily through Einstein’s great respect for Fr Lemaitre’s gifted mathematical and scientific mind. After a lecture about his theory of relativity at a European university in the 1930s, Einstein was approached by a science writer who asked him whether he thought anyone in the audience really comprehended his work. Einstein’s simple answer was “Lemaitre, certainly. As for the rest…”

The scientific dogma of the age was that the universe was static, eternal, and unchanging. Einstein also embraced this view, but it dismissed the beliefs of established religion that the universe was created from nothing.

However, Georges Lemaitre and Russian mathematician Aleksander Friedmann had more faith in Einstein’s mathematics than other scientists of their time. At first, Einstein payed little attention when they used his own equations to conclude that the universe is not static but expanding, and its rate of expansion is increasing when all established science said the opposite.

It was the American astronomer, Edwin Hubble (in whose honor the Hubble Space Telescope is named) who in 1929 discovered physical evidence that Lemaitre is right, that the universe is in fact expanding. Two years later in 1931, Father Georges Lemaitre concluded that the universe began “On a day without yesterday,” 13.8 billion years ago, with the explosion of a primordial atom from which space, time, and matter were created.

The idea was ridiculed, and “The Big Bang” was a pejorative term some scientists used to taunt the physicist priest. But he was right, and he turned science on its head with this revelation that has since been demonstrated with the discovery of cosmic background radiation emanating from The Big Bang.

Einstein, who first disagreed, ended up applauding the idea as “The most beautiful explanation of creation I have ever heard.” It was a bigger bang for science than even Einstein realized. It took the language of mathematics to comprehend that it points to what faith always told us: a universe arising out of nothing.

I think I finally came to some rudimentary understanding of the science behind this through the language of mathematics. For this I owe thanks to Robyn Arianrhod, and her book, Einstein’s Heroes: Imagining the World Through the Language of Mathematics (Oxford University Press 2005):

“In 1932, Lemaitre sowed the seeds of the Big Bang theory when he suggested that the universe had started as an explosion of a ‘primeval atom’ that… continued expanding from that explosive beginning. Some of the world’s most ancient creation myths have also imagined the world exploding from some sort of cosmic seed…”

“In 1970, English physicists Stephen Hawking and Roger Penrose showed that Einstein’s equations 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 spacetime. This meant that the Big Bang was not an ordinary explosion which took place at a specific three-dimensional location at a given time on the cosmic stage, but that Space and time themselves were actually created in the explosion, along with all matter and energy. Before this point … there was no time and no space. No geometry, no matter, nothing. The universe simply appeared out of nowhere. Out of nothing.”

— Einstein’s Heroes, p. 187

“The universe simply appeared out of nowhere. Out of nothing.” Take a moment to ponder that conclusion of science and it will sound a lot like a tenet of faith. Science, mathematics, and faith all open a window to the universe onto the same panoramic vista. And the awe this truth evokes is at one and the same time the comprehension of science and the inspiration of faith.

And as for my student-friend’s first question about the mystery of suffering in the light of faith, I can only gather up some prescientific humility to echo God against the protest of Job:

“Where were you when I laid the foundations of the earth?… Can you bind the chains of the Pleiades, or loose the cords of Orion?”

— Job 38: 4, 31

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Note from Father Gordon MacRae: Thank you for reading and sharing this post.

You might also like these other posts from Beyond These Stone Walls about the great adventure of science and faith:

On the Great Biblical Adventure, the Truth Will Make You Free

Science and Faith and the Big Bang Theory of Creation

The Higgs Boson God Particle: All Things Visible and Invisible

Did Stephen Hawking Sacrifice God on the Altar of Science?

The James Webb Space Telescope and an Encore from Hubble

The Eucharistic Adoration Chapel established by Saint Maximilian Kolbe was inaugurated at the outbreak of World War II. It was restored as a Chapel of Adoration in September, 2018, the commemoration of the date that the war began. It is now part of the World Center of Prayer for Peace. The live internet feed of the Adoration Chapel at Niepokalanow — sponsored by EWTN — was established just a few weeks before we discovered it and began to include in at Beyond These Stone Walls. Click “Watch on YouTube” in the lower left corner to see how many people around the world are present there with you. The number appears below the symbol for EWTN.

Click or tap here to proceed to the Adoration Chapel.

The following is a translation from the Polish in the image above: “Eighth Star in the Crown of Mary Queen of Peace” “Chapel of Perpetual Adoration of the Blessed Sacrament at Niepokalanow. World Center of Prayer for Peace.” “On September 1, 2018, the World Center of Prayer for Peace in Niepokalanow was opened. It would be difficult to find a more expressive reference to the need for constant prayer for peace than the anniversary of the outbreak of World War II.”

For the Catholic theology behind this image, visit my post, “The Ark of the Covenant and the Mother of God.”

The James Webb Space Telescope and an Encore from Hubble

James Webb Space Telescope illustration courtesy of ESA/Hubble (Northrup Grumman).

As the James Webb Space Telescope entered orbit in a neutral gravity zone one million miles from Earth, the waning days of Hubble revealed an astronomical surprise.

June 22, 2022 by Fr. Gordon MacRae

“Where were you when I laid the foundations of the Earth? Can you bind the chains of the Pleiades or lose the chords of Orion?”

— Job 38:4,31

“Astronomy, Cosmology, Physics, Theology, History! Reading this blog is like enrolling in a graduate program at NYU.” That message was sent to me in a letter several years ago from a friend, an official of the Archdiocese of New York. I have written a good deal about the sciences of astronomy and cosmology, but only about a dozen posts over the 13-year lifespan of this blog.

In a recent telephone call from exile to my friend, Father George David Byers, STD, SSL, he chided me that I am way overdue for a science post. I cite his academic credentials here — a Doctorate in Sacred Theology from the Pontifical University Angelicum in Rome and a Licentiate in Sacred Scripture from the Pontifical Biblical Institute in Rome and Jerusalem — to reflect that his suggestion of a mere “science” post might contain just a hint of academic hubris. If so, I can only respond with a quote from the great English poet, Samuel Taylor Coleridge: “And the Devil did grin, for his darling sin is pride that apes humility.”

I actually did write a science post even before Father Byers brought it up. Please don't yawn or click me away just yet. For me, this is a very big deal and it has a “WOW” factor. The Hubble Space Telescope, launched into Earth orbit in 1990, has been operating for 32 years and has far exceeded its intended operational limit. In the waning days of Hubble, it surprised Earthbound scientists with an amazing discovery. I will get to it below, but first ...

Star Trek: The Next Generation

The next generation of space exploration was born with the December 25, 2021 launch of the James Webb Space Telescope (JWST). It has recently arrived at its designated orbit in what is called a “Lagrange point.” Named for the 18th Century French mathematician and physicist, Joseph Louis Lagrange, a “Lagrange point” is a zone of neutral gravity between the Earth and the Sun about one million miles from Earth. That point is now host to the revolutionary James Webb Space Telescope.

Thousands of scientists and engineers took part in this project on the cutting edge of astronomical science. The Space Telescope Science Institute will operate and monitor it from Baltimore. Webb successfully separated from its launch vehicle and unfolded a giant solar array to power the telescope. Armed with huge primary and secondary mirrors and a suite of cameras, spectrometers, and other instruments, the Webb Telescope is the size of a large truck. It is capable of producing spectral images of 100 galaxies at a time. As one scientist described it:

“[Webb] will crack open the treasure chest of the magnificent infrared sky invisible to the human eye. If a bumblebee hovered in space at the distance from Earth to the Moon, Webb will be able to see both the sunlight it reflects and the heat it emits.”

One of the burning questions of both science and faith that Webb may lend itself to solving is the existence of life elsewhere in the Universe. All the latest media craze about evidence of UFOs points only to Earth-bound technology. Distances between stars are like impenetrable barriers. If sentient life exists, we will detect each other long before we ever encounter each other. So far, after decades of searching, no such evidence yet exists.

A general consensus among astronomers is that life does exist “out there,” but complex life is much more rare, and sentient complex life like us, if it exists elsewhere at all, is extremely rare. I once wrote a post laying out a case for our uniqueness in the Cosmos. It was, “Star Trek and the Search for Extraterrestrial Intelligence.”

That post introduced readers to a remarkable contributor to the science that made the Webb Space Telescope possible. Astronomer Vera Rubin defied all the stereotypes of her time to become one of the great icons of cosmology. She discovered that the visible Universe that we see in the night sky is only about 10 to 15 percent of what is actually there. She wrote of this in “Dark Matter in the Universe” (Scientific American, 1998):

“As we have done for centuries, we gaze into the night sky from our planetary platform and wonder where we are in this cavernous cosmos. Flecks of light provide clues about great objects in space. And what we do discern about their motions and apparent shadows tells us that there is much more that we cannot yet see.

“From every photon we collect from the universe’s farthest reaches, we struggle to extract information. Astronomy is the study of light that reaches Earth from the heavens. Our task is not only to collect as much light as possible — from ground and space-based telescopes — but also to use what we can see in the heavens to understand better what we cannot see and yet know must be there.

“Based on 50 years of accumulated observations of the motions of galaxies and the expansion of the universe, most astronomers believe that as much as 90 percent of the stuff constituting the universe may be objects or particles that cannot be seen. In other words, most of the universe’s matter does not radiate. It provides no glow that we can detect in the electromagnetic spectrum. … We call this missing mass ‘dark matter,’ for it is the light, not the matter, that is missing.”

— Vera Rubin, 1998

In coming months, the first images to come from the James Webb Space Telescope now hovering one million miles between Earth and the Sun may provide humanity’s first illumination of dark matter, that 90-percent of the Universe that we have never before seen. The Webb Telescope enormous primary mirror has unfolded perfectly. In coming months Webb’s first images of the ancient cosmos will arrive on Earth. Be prepared to be amazed!

A Pre-retirement Surprise from Hubble

My favorite post of the past year is one that was only half written by me. The other (and far better) half was written by Fr. Andrew Pinsent, a noted particle physicist and Research Director at the Ian Ramsay Center for Science and Religion at Oxford University in the U.K. I was way out of my element in this joint venture, but it was this humble blog’s best foot forward. The jointly written post was, “Fr Georges Lemaître, the Priest Who Discovered the Big Bang.”

It was among our most popular and enduring posts of the last year. Perhaps it was just a nice break from this world’s seemingly never-ending preoccupations with war, pestilence, scandal, and other obsessions of our time.

In that post, I quoted an excerpt from the book, 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.... Einstein’s equation 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.” ( p. 187)

“The Universe simply appeared out of nowhere. Out of nothing.” And it all happened in an instant 13 billion years ago on “A day without yesterday.” This conclusion of modern cosmology was the work of a brilliant priest, mathematician and physicist, Fr. Georges Lemaitre. If you wonder about the relevance of faith in the scientific world, you may be surprised to learn that science and the Catechism of the Catholic Church are on the same page in describing 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)

The Hubble Space Telescope is destined to soon retire, but not before it gave us some amazing images of the visible Cosmos. Its latest surprise is a photograph of the most distant star ever seen by human eyes or instruments, a star now called “Earendel.” It is 28 billion light years from Earth. A light year is a measure of distance and not of time. It is the distance light travels in a single year at the constant rate of 186,000 miles per second. A light year works out to be 5.6 trillion miles. Multiply that by 28 billion and that is the distance from Earth to Earendel. Please don’t ask me to convert this to kilometers.

The light Hubble captured from Earendel emanated from the star 12.9 billion years ago in the very infancy of creation as calculated by Fr. Georges Lemaitre. The only reason Hubble could spot this star is because of a rare cosmic alignment. A galaxy cluster beyond the Milky Way — our galaxy — was positioned in such a way that its gravity bent light creating a sort of cosmic magnifying lens.

If you did the math, you might have noticed that Earendel is twice the distance of the age of the Universe which is possible only because the Universe has continually expanded over those 13 billion years. This expansion, and the now proven fact that galaxies are defeating gravity by speeding away from one another, was also a discovery of the physics of Fr. Georges Lemaitre which in the end were applauded and embraced by Albert Einstein.

Who says priests are boring?

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Note: Thank you for reading and sharing this post. Please visit our “Special Events” page and these related links:

Star Trek and the Search for Extraterrestrial Intelligence

Fr Georges Lemaître, the Priest Who Discovered The Big Bang

“A Day Without Yesterday:” Father Georges Lemaitre and The Big Bang

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“A Day Without Yesterday:” Father Georges Lemaitre and The Big Bang

The Catholic Church in Belgium can take pride in the story of Georges Lemaitre, the priest and mathematician who changed the mind of Einstein on the creation of The Universe.

(This post needs a disclaimer, so here it is. It’s a post about science and one of its heroes. It’s a story I can’t tell without a heavy dose of science, so please bear with me. I read the post to my friends Pornchai, Joseph, and Skooter. Pornchai loved the math parts.  Joseph said it was “very interesting,” and Skooter yawned and said, “You CAN’T print this.” When I told Charlene about the post, she said, “Well, people may never read your blog again.” Well, I sure hope that’s not the case. I happen to think this is a really cool story, so please indulge me these few minutes of science and history.)

The late Carl Sagan was a professor of astronomy at Cornell University when he wrote his 1980 book, Cosmos.  It spent 77 weeks on the New York Times  Best Seller List. Later in the 1980s, Dr. Sagan narrated a popular PBS series also called “Cosmos,” based on his book. Sagan was much imitated for his monotone intonation of “BILLions and BILLions of stars.” I taped all the installments of “Cosmos,” and watched each at least twice.

More than once, I fell asleep listening to Sagan’s monotone “BILLions and BILLions of stars.” I hope you’re not doing the same right now. Science was my first love as a geeky young man. Religion and faith eventually overtook it, but science never left me.  Astronomy has been a lifelong fascination, and Carl Sagan was one of its icons. That’s why I was enthralled 25 years ago to walk out of a bookstore with my reserve copy of Sagan’s first and only novel, Contact  (Simon & Shuster, 1985).

Contact  was about radio astronomy and the SETI project — the Search for Extraterrestrial Intelligence. It wasn’t science fiction in the way “Star Trek” was science fiction. Contact was science AND fiction, a novel crafted with real science, and no one but Carl Sagan could have pulled it off. The sheer vastness of the Cosmos unfolded with crystal clarity in Sagan’s prose, a vastness the human mind can have difficulty fathoming. Anyone who thinks we are visited by aliens from other planets doesn’t understand the vastness of it all.

The central theme of Contact  was the challenge astronomy poses to religion. In the story, SETI scientist Eleanor Arroway — a wonderful character portrayed in the film version by actress Jodie Foster — becomes the first radio astronomer to detect a signal emitting from another civilization. The signal came from a planet orbiting Vega, a star, not unlike our own, about 26 light years from Earth. The message of the book (and film) is clear: if another species like us exists, and we are ever to have contact, it will be in just this way — via radio waves moving through space at light  speed.

Here comes the geeky part. For those who never caught the science bug, a “light year” is a unit of distance, not time. Light moves through space at a known rate of speed — about 186,000 miles per second. At that rate, light travels through space about 5.86 trillion miles in one year. That’s a “light year,” and in numbers it represents 5,860,000,000,000 miles. In the vacuum of space, radio waves also travel at the speed of light.

The galaxy in which we live — the one we call “The Milky Way” — is a more or less flat spiral disk comprised of about 100 billion stars. The Milky Way measures about 100,000 light years across.   That’s a span of about 6,000,000,000,000,000,000 miles, give or take a few. Please don’t ask me to convert this to kilometers!

This means that light — or radio waves — from across our galaxy can take up to 100,000 years to reach Earth. One of The Milky Way Galaxy’s approximately 100 billion stars is shining in my cell window at this moment. Our galaxy is one of about fifty billion galaxies now known to comprise The Universe. The largest known to us is thirteen times larger than The Milky Way. You get the picture. The Universe is immense.

If E.T. Phones Home, Make Sure It’s Collect!

In a recent post I made a cynical comment about UFOs. I wrote, “The real proof of intelligent life in The Universe is that they don’t come here.” It was an attempt at humor, but the problem with searching for extraterrestrial intelligence is one of practical physics. The limit of our ability to “listen” is a mere few hundred light years from Earth, a tiny fraction of the galaxy — a mere survey of our own backyard. If there is another civilization out there, we may never know it.

Even if we hear from them some day, it will be a one-sided conversation. The signal we may one day receive might have been broadcast hundreds — perhaps thousands — of years earlier. If we respond, it will take hundreds or thousands of years for our response to be detected. We sure won’t be trading recipes, or asking, “What’s new?”  If there’s anyone out there — and so far we know of no one else — we can forget about any exchange of ideas, let alone ambassadors.

Still, I devoured Contact  twice in 1985, then I wrote Carl Sagan a letter at Cornell.  I understood that Sagan was an atheist, but the central story line of Contact was the effect the discovery of life elsewhere might have on religion, especially on fundamentalist Protestant sects who seemed the most threatened by the discovery.

I thought Carl Sagan handled the controversy quite well, without judgments, and even with some respect for the religious figures among his characters. In my letter, I pointed out to Dr. Sagan that Catholicism, the largest denomination of Christians in America, would not necessarily share in the anxiety such a discovery would bring to some other faiths. I wrote that if our galactic neighbors were embodied souls, like us, then they would be in need of redemption in the same manner in which we have been redeemed.

Weeks later, when an envelope from Cornell University’s Department of Astronomy and Space Sciences arrived, I was so excited my heart was beating BILLions and BILLions of times! Carl Sagan was most gracious. He wrote that my comments were very meaningful to him, and he added, “You write in the spirit of Georges Lemaitre!”

I framed that letter and put it on my rectory office wall. I wanted everyone I knew to see that Carl Sagan compared me with Georges Lemaitre! I was profoundly moved. But no one I knew had a clue who Georges Lemaitre was. I must remedy that.  He was one of the enduring heroes of my life and priesthood. He still is!

Father of the Big Bang

Georges Lemaitre died on June 20, 1966 when I was 13 years old. It was the year “Star Trek” debuted on network television and I was mesmerized by space and the prospect of space travel.  Georges Lemaitre was a Belgian scientist and mathematician, a pioneer  in astrophysics, and the originator of what became known in science as “The Big Bang” theory — which, by the way, is no longer considered in cosmology to be a theory.

But first and foremost, Father Lemaitre was a Catholic priest. He was ordained in 1923 after earning doctorates in mathematics and science.  Father Lemaitre studied Einstein’s celebrated general theory of relativity at Cambridge University, but was troubled by Einstein’s model of an always-existing, never changing universe. It was that model, widely accepted in science, that developed a wide chasm between science and the Judeo-Christian understanding of Creation. Einstein and others came to hold that The Universe had no beginning and no end, and therefore the word “Creation” could not apply.

Father Lemaitre saw problems with Einstein’s “Steady State” theory, and what Einstein called “The Cosmological Constant” in which he maintained that The Universe was relatively unchanging over time. From his chair in science at Catholic University of Louvain in Belgium from 1925 to 1931, Father Lemaitre put his formidable mind to work.

He developed both a mathematical equation and a scientific basis for what he termed the “primeval atom,” a sort of cosmic egg from which The Universe was created. He also concluded that The Universe is not static, as Einstein believed, but expanding at an ever increasing rate, and he put forward a mathematical model to prove it. In 1998, Father Lemaitre was proven to be correct.

Einstein publicly disagreed with Lemaitre’s conclusions, and the priest was not taken seriously by mainstream science largely because of that. In his book, The Universe in a Nutshell  (Bantam Books, 2001), mathematician and physicist Stephen Hawking addressed the controversy:

“If galaxies are moving apart now, it means they must have been closer together in 
the past. About fifteen billion years ago, they would have been on top of each other, and the density would have been very large. This state was called the “primeval atom” by the Catholic priest Georges Lemaitre, who was the first to investigate the origin of the universe that we call the big bang. Einstein seems never to have taken the big bang seriously”

— The Universe in a Nutshell, p. 22

Stephen Hawking actually calculated the density of Father Lemaitre’s “Primeval Atom” just prior to The Big Bang.  It was 1,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000, tons per square inch.  I haven’t checked this math myself, so we’ll take Professor Hawking’s word for it.

Though Einstein disagreed with Father Lemaitre at first, he respected his brilliant mathematical mind. When Einstein presented his theories to a packed audience of scientists in Brussels in 1933, he was asked if he thought his ideas were understood by everyone present. “By Professor D, perhaps,” Einstein replied, “And certainly by Lemaitre, as for the rest, I don’t think so.”

When Father Lemaitre presented his concepts of the “primeval atom” and an expanding universe, Einstein told him, “Your mathematics is perfect, but your grasp of physics is abominable.”

They were words Einstein would one day have to take back. When Edwin Hubble and other astronomers read Father Lemaitre’s paper, they became convinced that it was Einstein’s physics that was flawed. They could only conclude that the priest and scientist was correct about the creation and expansion of The Universe from the “primeval atom,” and the fact that time, space and matter actually did begin at a moment of creation, and that The Universe will end.

It’s an ironic twist that science often accuses religion of holding back the truth about science. In the case of Father Lemaitre and The Big Bang, it was science that refused to believe the evident truth that a Catholic priest proposed to a mathematical certainty: that the true origin of The Universe, and of time and space, is its creation on “a day without yesterday.”

For his work, Father Lemaitre was inducted into the Royal Academy of Belgium, and was awarded the Franqui prize by an international commission of scientists. Pope Pius XI applauded Father Lemaitre’s view of the creation of the universe and appointed him to the Pontifical Academy of Science. Later, Pope Pius XII declared that Father Lemaitre’s work was a vindication of the Biblical account of creation.

The Pope saw in Father Lemaitre’s brilliance a scientific model of a created Universe that bridged science and faith and halted the growing sense that each must entirely reject the other.

Einstein finally came around to endorse, if not openly embrace Father Lemaitre’s conclusions. He admitted that his concept of an eternal, unchanging universe was an error. “The Cosmological Constant was my greatest mistake,” he said.

In January, 1933, Father Georges  Lemaitre traveled to California to present a series of seminars. When Father Lemaitre finished his lecture on the nature and origin of The Universe, a man in the back stood and applauded, and said, “This is the most beautiful and satisfying explanation of creation to which I have ever listened.” Everyone present knew that voice. It was Albert Einstein, and he actually said the “C” word so disdained by the science of his time: “Creation!”

“I want to know how God created this world. I am not interested in this or that phenomenon, in the spectrum of this or that element. I want to know God’s thoughts; the rest are details.”

— Albert Einstein

“The more we know of the universe, the more profoundly we are struck by a Reason whose ways we can only contemplate with astonishment” … Albert Einstein once said that in the laws of nature, ‘there is revealed such a superior Reason that everything significant which has arisen out of human thought and arrangement is, in comparison with it, the merest empty reflection.’ In what is most vast, in the world of heavenly bodies, we see revealed a powerful Reason that holds the world together.”

— Pope Benedict XVI, In the Beginning, (Eerdmans, 1986)

“In the Beginning, God created the heavens and the earth. The earth was without form and void, and darkness was upon the face of the deep; and the spirit of God was moving over the face of the waters.”

— Genesis 1:1

“Live long and prosper.”

— Mr. Spock

For Further Reading:

‘A Day Without Yesterday’: Georges Lemaitre & the Big Bang