The Fine-Tuning Argument For Intelligent Design

This essay does not pretend to break new scientific ground. Rather, it aims to condense and render generally accessible a powerful, science-based argument in favor of an intelligent designer of the universe and of the earth so as to support intelligent life. This essay will proceed in four steps: (1) summarizing (with Claude’s help) the ways in which the universe in general and the laws of physics are “fine-tuned” for intelligent life; (2) summarizing (with Claude’s help) the ways in which the Earth is fine-tuned for life; (3) quoting some Actual Scientists who do not accept the argument for intelligent design, but whose statements in a podcast discussing the fine-tuning problem, to my mind, strongly support it; and (4) my ultimate evaluation of the evidence, arguments, and remaining questions.

Where I am mostly quoting Claude, I add my commentary in [brackets].

Part 1: Summary of Cosmological Fine-Tuning

The laws of physics are “fine-tuned” to support the high degrees of complexity and stability required for intelligent life. To understand the significance of this fact, you need to understand that theoretical physics does not predict how strong gravity or the strong or weak nuclear forces are. You have to measure those, and for all science can tell, they might just as well have been stronger or weaker. And if basically any of them were different, the universe would not support life as we know it. More pointedly, in many cases, a small difference would mean that the universe would not have any complex structures, which means that not only would it not support life as we know it, but it is difficult to imagine how it could support any life at all. This is confirmed by the Actual Scientists in the podcast episode I quote in Section 3 below.

With that in mind, I asked Claude to summarize how the laws of physics are “fine tuned” for intelligent life. Here’s what Claude spit out:

The Four Fundamental Forces

The standard model of particle physics and cosmology combined contains approximately 31 physical constants, all of which appear to have unusual precision (Wikipedia). The most critical:

1. Gravitational Force (G) [i.e., how hard thing 1 “pulls” on thing 2, depending on their mass and distance from each other]

If too weak, planets and stars cannot form; if too strong, stars burn up too quickly (Magis Center).
If gravity increased by just 1 part in 10^34, the universe couldn’t have life-sustaining planets (Magis Center).

2. Electromagnetic Force (Fine Structure Constant, α) [the force that, through the mechanism of photon exchange, determines the strength of electromagnetic interactions, e.g., how strongly protons, electrons, and other charged particles attract or repel each other]

Value approximately 0.007297; if above 0.008, no hydrogen would exist—all would fuse into helium after the Big Bang (Wikipedia).
If much stronger or weaker, stable chemical bonds cannot form (Magis Center).

3. Strong Nuclear Force [the force that, through the mechanism of gluon exchange, binds quarks together to form protons and neutrons and also, as a residual effect, binds protons and neutrons together to form atomic nuclei, overcoming the electromagnetic repulsion between protons]

Must be tuned to at least 0.5% precision; if 2% greater in magnitude, hydrogen would fuse into stable diprotons instead of helium, and stars would not exist (University of Mississippi).
Fine-tuning of the strong force constant is required for the production of carbon and oxygen in stars (Springer).

4. Weak Nuclear Force [the force that, through the mechanism of boson exchange, enables radioactive decay and other “chemical reactions” at the sub-atomic level, including the formation of neutrons from protons, essential for the formation of any atom other than hydrogen, and essential for the nuclear fusion that happens in stars]

If much stronger or weaker, life-essential stars could not form (Magis Center).

The Cosmological Constant (Dark Energy)

The cosmological constant must be fine-tuned to something like 1 part in 10^120. If slightly more positive, the universe would fly apart [too quickly for galaxies to form]; if slightly negative, it would collapse [from the force of gravity] (Stanford Encyclopedia of Philosophy).

The quantum field theory calculation suggests the cosmological constant should be fifty orders of magnitude larger than observed—equivalent to expecting an inch but measuring 1.5 septillion miles instead. Solas.

Critical Ratios Between Constants

N, the ratio of the electromagnetic force to the gravitational force between a pair of protons, is approximately 10^36 (Wikipedia)—an extraordinarily precise balance.

If the gravitational constant (G) or weak force constant (g_w) differed by even one part in 10^50, the balance against the cosmological constant would be upset and the universe’s structure drastically altered. (Solas).

Initial Conditions of the Big Bang

The early universe had extremely low entropy—it did not start in thermodynamic equilibrium. Different regions of the Cosmic Microwave Background are outside each other’s light cones and could never have influenced each other, yet they have nearly uniform temperature. This cannot be explained by heat transfer alone and suggests the universe began with precisely calibrated initial conditions (Springer).

[I have to expand on Claude’s summary here. Black holes are extremely entropic, and there is actually an elegant equation in physics, articulated by Stephen Hawking (though I don’t pretend to understand it), that lets us measure the entropy of a black hole based on the surface area of its event horizon (the point at which escaping the black hole would require velocity higher than the speed of light). The numbers are massive: black holes are extremely disorderly entities, and the more massive the black hole, the greater its entropy. Yet the singularity that preceded the big bang is believed by mainstream science to have been superlatively orderly, even though I cannot imagine what in nature could distinguish a single point containing all the mass of the universe from a theoretical monster black hole that had just finished swallowing the last piece of the universe a moment before, with respect to its internal structure and its degree of entropy.

The orderliness of the original singularity is inferred from the second law of thermodynamics, as confirmed by observation of the cosmic microwave background. That is to say, entropy increases with time, and when we observe the cosmic microwave background–the “echo” of the big bang–we find extraordinary uniformity–so the universe started out with very low entropy (and a high degree of order), and its entropy has been increasing ever since. This uniformity is unexplained by science, and fairly inexplicable.

Had the initial conditions of the universe been even slightly more entropic, or slightly less calibrated–had, e.g., the mass and energy of the universe not been evenly distributed to an almost perfect degree, then the incredible density of the early universe would have resulted in immediate formation of black holes: the matter/energy would immediately “clump” in the more gravitationally dense places, and with such immense density, any “clumping” means a black hole. In this scenario, black holes would have eaten up most of the mass of the universe within moments. Thus, the universe would have almost immediately maxed out its entropy, resulting in a boring universe where nothing happens. But instead, the second law of thermodynamics has played out over 13.8 billion years and counting, and there is still a very high degree of order everywhere you look.

The degree of improbability of the big bang playing out in this way is disputed, but it appears to be inconceivably large–similar to a massive landslide occurring without any rocks hitting each other (with each rock collision that didn’t happen representing the formation of a black hole). One famous physicist estimated the improbability to be 1 in 10^10^123–that is, 1 with 10^123 zeros after it, which is vastly more than the number of atoms in the observable universe.

Now back to Claude’s summary.]

Particle Properties

The Hoyle state—the third-lowest energy state of the carbon-12 nucleus—must be tuned to between 7.596 and 7.716 MeV. If outside this range, insufficient carbon would exist to support life (University of Mississippi).

The masses of elementary particles are finely tuned; the chemical complexity of life depends on their specific values (Springer).

The Dimensionality Problem

The number of spatial dimensions (D) is 3. According to Martin Rees, life could not exist with 2 or 4 dimensions of spacetime (University of Mississippi).

Current Scientific Assessment

Physicist Paul Davies has stated: “There is now broad agreement among physicists and cosmologists that the universe is in several respects ‘fine-tuned’ for life” (Wikipedia).

[end of Claude’s summary]

Part 2: Summary of Earth-Specific Fine-Tuning

I have long thought it remarkable that the Earth is a self-regulating body in many ways, rendering plausible the “Gaia hypothesis”—which some take so far as to postulate that the Earth is alive or even conscious. After some initial queries, which I exclude only for brevity, I asked Claude to summarize the negative feedback loops that are the mechanisms by which the earth regulates its temperature, atmospheric makeup, ocean pH, etc., in a manner that maintains the conditions necessary for life. Here is Claude’s response, excluding (again only for brevity) some less-compelling or semi-redundant examples:

Let me systematically extract all the negative feedback loops that maintain Earth’s habitability:

Atmospheric & Climate Equilibriums

1. CO2-Temperature Regulation (Silicate Weathering Cycle)

High CO2 → stronger greenhouse effect → higher temperature → faster chemical weathering of rocks → more CO2 consumed → CO2 decreases
Low CO2 → weaker greenhouse effect → lower temperature → slower weathering → CO2 accumulates → temperature rises back up
Timescale: Millions of years (geological thermostat)

….

3. Photosynthesis-Respiration Balance

O2 accumulates → respiration and decomposition accelerate (consume O2 faster) → O2 stabilizes
O2 depletes → respiration slows → photosynthesis dominates → O2 rises back
Biological thermostat operating on decadal to century timescales

4. Water Vapor Feedback (Negative Component)

Temperature rises → more evaporation → more water vapor (a greenhouse gas) → temperature rises further (this is the positive part)
BUT: More water vapor → more clouds → clouds reflect sunlight back to space → cooling effect → moderates temperature rise
Net effect: Cloud formation provides partial negative feedback that slows (but doesn’t prevent) warming

5. Biological Oxygen Production & Consumption

Oxygen rises above a certain threshold → more UV-absorbing ozone forms → protects organisms from radiation damage → organisms survive to respire and consume oxygen
This creates a stable oxygen “set point” where production and consumption balance

Oceanic Equilibriums

6. Ocean Heat Absorption & Release

Surface temperature rises → ocean absorbs more heat → thermal energy stored in deep water
Later, cooler seasons → ocean releases stored heat → moderates cooling
Negative feedback: Oceans buffer temperature extremes

7. Carbonate Buffer System (Ocean pH)

pH drops (more acidic) → carbonate ions are consumed by H+ ions → but dissolved CO2 and bicarbonate shift to replenish carbonates → pH returns toward equilibrium
pH rises (more alkaline) → fewer H+ ions consume carbonates → carbonate accumulation → shifts system back toward neutral
Constraint mechanism: Maintains pH within narrow range suitable for marine life

….

Biological & Ecosystem Equilibriums

10. Predator-Prey Population Dynamics

Prey population rises → more food for predators → predator population rises (with lag)
Predator population rises → predation pressure increases → prey population crashes
Prey crash → predators starve → predator population crashes
Predator scarcity → prey population recovers → cycle repeats
Negative feedback: Each species’ growth is limited by the other; neither can monopolize resources

11. Disease Regulation of Population

Population density increases → disease transmission increases → mortality rises → population crashes
Population crashes → disease transmission decreases → survivors recover → population rebounds
Natural population ceiling: Disease acts as a stabilizing mechanism

….

13. Nutrient Depletion & Plant Growth

Plants grow rapidly → deplete soil nutrients → growth slows due to nutrient limitation
Growth slowdown → less nutrient uptake → decomposition accumulates → nutrients regenerate → growth accelerates again
Timescale: Seasonal to multi-year cycles

[Note: one of the deleted items was this same cycle as it appears with phytoplankton]

14. Forest Fire Feedback

Vegetation accumulates → fuel loads increase → fire likelihood increases → fire burns accumulated biomass → nutrients released
Post-fire: colonizing species grow rapidly (nutrient-rich ash) → eventually stabilize → fuel accumulates again
Regularity: Prevents catastrophic megafires and maintains ecosystem diversity

Hydrological Equilibriums

15. Evaporation-Precipitation Balance

Water removed from surface (evaporation) → atmospheric moisture increases → precipitation increases → water returns
Drought reduces evaporation → atmospheric moisture drops → precipitation drops further (initial amplification)
BUT: Lower evaporation → cooler atmosphere → less evaporation possible → system stabilizes at lower moisture level
Constraint: Finite water supply; can’t evaporate more than exists

16. Groundwater-Surface Water Exchange

Heavy rainfall → infiltration increases → groundwater rises → hydraulic pressure forces groundwater back to surface (springs, seepage)
This limits groundwater accumulation and maintains water distribution between surface and subsurface

17. Transpiration Regulation

Soil moisture high → plants transpire freely → soil moisture depletes → stomata close (to conserve water) → transpiration slows → soil moisture stabilizes
This prevents both waterlogging and complete depletion

Geological Equilibriums

18. Volcanic Outgassing & Atmospheric Escape

Volcanic CO2 outgassing increases atmospheric CO2 → temperature rises → increases atmospheric escape of light molecules → some CO2 is lost to space
This provides an upper bound on how much CO2 can accumulate from volcanism alone

….

20. Sediment Deposition & Erosion Balance

Rivers deposit sediment on coastal plains and deltas → sediment accumulates → weight compresses lower layers → creates topographic relief → steeper slopes → erosion increases
Increased erosion → sediment flux matches deposition → equilibrium maintained
Prevents unlimited sediment accumulation in one location

Atmospheric Gas Equilibriums

21. Oxygen & Fire Feedback

Oxygen concentration rises above ~25% → fires burn faster and hotter → biomass consumed faster → oxygen consumed faster → concentration drops
Oxygen falls below ~15% → fires burn slower → biomass accumulates → oxygen production exceeds consumption → concentration rises
Constraint: Maintains O2 within ~15-35% range (historical range); system “prefers” ~21%

22. Nitrogen Cycle Feedback

Available nitrogen increases → plants grow → biomass increases → more decomposition → denitrification increases (bacteria convert nitrate back to N2)
Nitrogen is lost to atmosphere → available nitrogen drops → plant growth slows → decomposition decreases → denitrification slows → nitrogen accumulates again
Biological regulation: Bacteria respond to nitrogen availability

[Note: two of the deleted items explain a similar cycle for sulfur and iron, where bacteria maintain a balance between different forms of sulphur and iron and cycle those nutrients through the environment.]

[Note 2: I studied the nitrogen cycle to understand this item better, and I think Claude oversimplifies it slightly, but the full truth is even more remarkable. There are actually different kinds of bacteria that interact with nitrogen differently–some use N2 in a way that chemically “captures” it in a form that, unlike N2 gas, is bioavailable to plant life. Talk about a thankless but essential job that nobody sees but everybody depends on! An entirely different class of bacteria turns the nitrogen in decomposing organic matter back into N2. So these two classes of bacteria thrive or decline depending on availability of nitrogen in their required form, thereby cycling nitrogen between its atmospheric and bioavailable forms and maintaining a balance between them.]

.…

The Crucial Pattern

What these reveal: Nearly every process that could drive Earth away from habitability has a built-in constraint that pushes it back. The architecture is:

Primary driver (e.g., temperature rises)
Consequence (e.g., increased evaporation)
Secondary consequence that opposes primary driver (e.g., more clouds reflect heat)
Net result: Stabilization at a new equilibrium

The system doesn’t prevent change—it channels change through self-correcting mechanisms. This is why Earth has remained habitable across 3+ billion years despite massive variations in solar output, asteroid impacts, and biological innovation.

[Note: since life began on earth, and estimated 3.5 – 4 billion years ago, the sun’s luminosity has increased by an estimated 25-30%, yet the earth has maintained a relatively stable range of temperatures due to these negative feedback loops]

[End of Claude’s Summary with regard to Earth’s negative feedback loops]

I next asked Claude to summarize the evidence supporting the “Rare Earth Hypothesis”–that is, roughly, the notion that, even given the laws of physics as we know them, a life-supporting planet is still highly improbable. Here’s what Claude generated:

Chief Evidences for the Rare Earth Hypothesis

1. Galactic Location Requirements

Stars must orbit within the galactic habitable zone—a ring 7 to 9 kiloparsecs from the galactic center, which includes only 5-10% of stars in the Milky Way. Stars must maintain nearly circular orbits that avoid spiral arms, regions of high star density and radiation that would disrupt planetary systems (Wikipedia).

2. Planetary System Configuration

Complex life requires a rocky terrestrial planet with plate tectonics for nutrient recycling; a nearly circular orbit maintaining the right distance from its star for liquid water; a stable planetary system with outlying giant planets positioned to shield inner planets from deadly comet impacts (Stanford Encyclopedia of Philosophy).

3. Stellar Requirements

The star must be single (binary stars create unstable planetary orbits), of the right temperature and mass (too hot and planets cook; too cold and they freeze), with a lifetime long enough for evolution to proceed (Stanford Encyclopedia of Philosophy).

4. Planetary Moon Requirements

A large, well-positioned moon is required to stabilize the planet’s axial tilt (preventing extreme climate swings) and to generate tidal patterns essential for early life development (Stanford Encyclopedia of Philosophy).

5. Planetary Size and Composition

The planet must be large enough to maintain a thick atmosphere and retain heat; a smaller planet’s core cools faster, ending plate tectonics*. It must be rocky, not a gas giant (Wikipedia).

6. Geophysical Features

The planet requires an oxygen-rich atmosphere, liquid water and large continental landmasses, and a strong magnetic field to deflect solar radiation (Springer).

[Note: the Earth’s magnetic field is generated by the convection currents of molten iron and nickel in the outer core.]

7. The Probabilistic Constraint

If nine critical factors each have a 1 in 10 probability of occurring, the combined probability drops by a factor of one billion. The Rare Earth hypothesis identifies at least 20 such factors, each requiring narrow parameter ranges (Notre Dame Philosophical Reviews).

8. Evolutionary Contingency

Ward (a paleontologist) emphasized that complex life requires specific evolutionary contingencies: symbiosis, the Great Oxidation Event, survival through mass extinctions, and the emergence of multicellular organisms—each representing historical accidents unlikely to recur identically elsewhere (Magis Center).

9. The Timing Problem

Complex life requires plate tectonics to have emerged at the right time (roughly 700 million years ago on Earth), chemical composition of the atmosphere to have achieved specific levels, and biological innovations (like photosynthesis and multicellularity) to have occurred within narrow temporal windows (Magis Center).

10. Observational Correlation

Gonzalez and Richards note that conditions making Earth habitable also make it optimal for scientific observation: an oxygen-rich atmosphere transparent to visible light, precise Moon-Sun geometry enabling perfect solar eclipses, stellar positioning allowing study of distant galaxies (Stanford Encyclopedia of Philosophy PhilArchive).

The Cumulative Case

. . . .

The hypothesis argues not merely that Earth-like planets are uncommon, but that the specific constellation of geological, astronomical, and biological factors required for complex life represents an extraordinarily improbable outcome.

[End of Claude’s summary]

Note: while nerding out learning about this stuff with Claude and other sources, I discovered an additional fact that deserves mention. Water’s abundance on the Earth is quite surprising. The Earth is within the part of the solar system that was extremely hot–essentially all water within the “snow line” was vaporized and then blown away from the Sun or chemically broken into O2 and H2 through radiation and solar wind. That means that the water that eventually filled up the oceans needed in large part to be delivered by asteroids whose rocks had chemically captured the water or released from the rocks on earth that had done so. But for the rocks to have captured the water in the first place, the water needed to be liquid. Water is liquid only in a narrow range of temperature (0 – 100 degrees Celsius). The solar system before the sun ignited was generally dramatically colder than 0 degrees Celsius; the inner solar system after it ignited was dramatically hotter than 100 degrees Celsius. Why was there liquid water present on the rocks, available for them to be chemically bonded within the rock? The answer is radioactive decay, largely from aluminum-26. Here’s Claude on this topic:

The fact that aluminum-26 was present in sufficient quantities to melt the interiors of early planetesimals is itself a somewhat fortunate circumstance. Aluminum-26 has a half life of only about 700,000 years — cosmically speaking, it disappears almost instantly. Its presence in early solar system materials in the quantities needed to drive aqueous alteration implies that a nearby supernova seeded our nascent solar system with freshly produced aluminum-26 shortly before or during its formation. Had that supernova not happened, or happened earlier, early asteroids might not have been internally heated enough to produce hydrated minerals — and Earth’s water delivery story might have been very different.

[End of Claude’s note about the fortunate timing of the aluminum-26’s arrival]

Even given the levels of aluminum-26 that arrived just in time to facilitate the chemical capture of liquid water by asteroids/planetoids in the proto-solar system, Claude informs me that the abundance of water on Earth is greater than science would predict–or, minimally, it is towards the most abundant extreme of the spectrum of what science understands would be feasible for a planet in the Earth’s position.

Finally, I note in passing that, even given the favorable conditions that maintain the Earth’s stable habitability that is required for evolution, the genesis of life itself remains highly mysterious and arguably just as improbable as the Earth’s self-maintaining and auto-correcting habitability. The most prominent proponent of this argument may be James Tour–see a short version of his argument here: https://www.youtube.com/watch?v=N_q_nS2VBu8. I don’t have the credentials in organic chemistry to evaluate his argument, but it seems to me intuitively improbable, to an immense degree, that a self-replicating cell containing functional DNA and capable of dividing that DNA and passing it to daughter cells that were also capable of the same feat would spontaneously happen through a natural process. Yet evolutionary theory does not apply until that has happened.

Part 3: Excerpts From Actual Scientists Who Don’t Accept Divine Design

Professor David Kipping interviews Grant Lewis

David: Welcome one and all to the cool worlds podcast with me, your host David Kipping. This time it is my pleasure to be joined by Grant Lewis who is a professor of astrophysics and cosmology at the University of Sydney…. Besides from his scientific articles he’s also written

four books. I’ve got one of them right here. Uh, a fortunate universe, life in a finely tuned universe. And the idea is pretty expansive. The idea that there are many, many constants of nature and other parameters of the universe which appear very selectively tuned such that if there were anything different, none of us would be here. Not just no humans, but not even atoms, nothing at all. And that has risen the question as to why. Why are all these numbers just right? One possibility is that the universe is just one of many. There’s a multiverse out there and of course we have to live in the universe where all of these constants are correct because of course we could never emerge in a universe where that was not possible. So that’s an example of the weak anthropic principle in effect. And this idea has generated controversy. I mean there are some scientists who said this [i.e., the multiverse] isn’t even science. We shouldn’t be talking about it. This is speculation. It’s untestable. So you know why are we even including this in science? And then Grant has been you know and others have been pushing back on this saying look if you really truly want to understand nature you can’t ignore this problem of fine-tuning which seems you know fairly pointed when you look at these individual cases it’s difficult to make progress if you just keep sweeping this under the rug and saying don’t worry about that it has to be discussed in a scientific context. So we’re going to get into that controversy.

….

Grant: So when we talk about doing physics, we have the mathematical side and we compare that to observations and experimentation. And um when we derive our laws of physics, it’s all good. They’re all mathematical except that the equations themselves are effectively sterile. And what I mean by that is that let’s take like Newton’s law of gravity for example, right? So this is something that’s taught in high school. You get the force is equal to you multiply the masses together you divide by the distance squared that gives you the the force except there’s another term in there which is normally written as a capital G that is Newton’s gravitational constant. Now the the issue is is that if you want to use the laws of gravity right you need to know what G is and the only way you can find out what G is is by measuring it, and there was a famous experiment by Caendish way back in the 1700s 1800s whereby he measured me G. And once you know G, then you can do all kinds of things. You you can’t predict G. You can’t predict G. Once you’ve measured it, you can send rockets to the moon. You can work out how fast an apple will fall, all those kind of things. So once you’ve measured that number, you’re good. And it turns out that that these kinds of numbers, the constants of nature are all through physics. So the speed of light, okay, uh you need that to do electromagnetism, all that kind of stuff. uh but there are other numbers all hidden throughout the laws of physics the mass of the electron etc etc, so you can’t do anything with physics until you know what these numbers are and the question is why are these numbers the value that they are?

. . . .

So there’s a famous number in electromagnetism known as the fine structure constant. It’s written as alpha and it has no units but it has a value of around 1 over 137. So it doesn’t matter how I would measure these numbers in feet or meters etc. When I bring them together and combine them into the fine structure constant it should always be 1 over 137. . . . Why isn’t it 1 over 13 or 1 over 13,000? And if it was one of these different values, physics would be different, right? Um, so again, sometimes in terms of raw numbers, things don’t really matter so much. But if I’m comparing alpha, which tells me how strong electromagnetism is, to G, which is telling me how strong gravity is, which is very weak in comparison. Yeah. These are two numbers that control how a star lives. And so if I imagine a universe where alpha and g are different, then stars would behave differently. They maybe they would burn faster and last a million years rather than a billion years. Maybe stars don’t ignite at all. Maybe there’s never enough gravitational squeeze in to to ignite the nuclear reactors at the hearts of stars. Or if you guess you got black holes everywhere, right? If you just turn if you made them comparable to each other. . . . If you wind G right up, then matter instead of collapsing down to form a star would just keep collapsing and everything would collapse into black holes. Mhm. So the the the fine-tuning question is about why the our universe has the combination of constants that it does because when we look at hypothetical universes where the constants would be different, it is exceedingly easy to make a sterile universe, a dead universe and uh it’s it’s easy to wipe out any chance of life in a universe. Essentially, the easiest thing to do is wipe out the periodic table, right? Because I mean, if you think about life and definitions of life and of course you run into the science fiction argument again, right? But life is based upon energy and information processing and you can only do that with complexity. And for us, for humans, that complexity is built into the fact that we are molecular machines. We are built out of an array of 92 natural elements and their isotopes, etc. But again, if I mess around with the strength of the strong force, which is the thing that binds nuclear together, then I can just ensure that things don’t stick together. I would have a universe that only has hydrogen in it. And you can’t do anything in a universe that has only hydrogen. The periodic table has one element. . . . It’s a boring universe.

. . . .

So that’s the fine-tuning question is why why does our universe have the values that it does? So that’s when you get into the bigger questions of well firstly how do you form universes and how do you give them laws of physics etc. uh and uh this is where the argument really start because there’s a theological viewpoint that the the the properties of our universe were uh set by a creator that wanted a universe in which life flourishes. But if you want a a physical sort of solution um without creators and simulations and that kind of things, there’s only two real possibilities in my mind. Number one is that that there really isn’t any freedom in our universe, right? That eventually when we do all of our our thinking and get to the ultimate theory of physics that there’s no freedom left i.e. we will find that the fine structure constant is purely algebraic. It’ll be pi to the power of e, couldn’t be anything else. Yeah, it couldn’t be anything else which in my mind is a really unsatisfying thing to find be because we’ve moved fine-tuning somewhere else. Right? Because we have mathematics that describe our universe. But the mathematics that describe our universe is just a tiny part of essentially the infinite book of possible mathematics. So why did our universe decide on this set of mathematics rather than something else it could have grabbed off the shelf? The other solution which I guess is my favored and just because it’s it’s favored more than anything is this notion of of us being part of a multiverse that there is some process whereby universes are being created and in that creation process um the the laws of physics are written for each universe in some sort of like random fashion right there’s some stochastic sort of choice that’s made like in the number of dimensions and the mass of the electron etc. that’s set or just fluctuates.

. . . .

And I guess if you reject the multiverse, you’re left with the alternatives which are not very palatable, right? you have to say either God did it or simulator did it which doesn’t really satisfy anyone because then you have to say well why does God have those parameters anyway or why does the simulator live in a universe that’s conditioned for life anyway so you still kind of have the same infinite regression problem um and if you just say it’s coincidence then well that’s just deeply unsatisfying isn’t it just to say just just happens to be so don’t ask any questions about that that’s kind of almost antitheical to the very way we conduct ourselves as scientists.

. . . .

David: So, that was my conversation with Grant Lewis. I hope you enjoyed it as much as I did. These kind of conversations are always real head scratchers. I don’t think I’m ever going to have a satisfying answer to this fine-tuning problem. Fine tuning has so many aspects not just of course in a cosmological sense which we’re mostly focused on that conversation but as we kind of alluded to also exists even thinking about the earth and the rare earth hypothesis and of course you know Warden Brownley brought that up you know year 2000 I think that was their famous book the rare earth hypothesis and it has been a constant topic of discussion and controversy whenever you look at ourselves be our universe our planet even humanity and try to ask about what it means for what else might be out there because you know proponents will say this is the data we have we have to work with it and critics will say we are completely biased by having this one data point and so we shouldn’t even attempt to learn anything from it but there is something strange here I mean when you look at something in cosmological sense all those parameters being so finely tuned it it does demand an answer and I’m not satisfied with the multiverse answer. I have certainly been thinking about a lot recently in you know many nights in bed I’ve been kind of awake thinking like this this is not very satisfying we need a better answer to this than what we have but it’s not really obvious what else you would invoke uh hopefully you know I think that the dream scenario be that one day we would come up with some kind of unified glorious theory that would explain all of these constants all of these numbers and we could all just rest and go to sleep but suddenly Even now we seem to be a very long way away from that point and you know I think cosmology is such an active field. We keep hearing of all these tensions and crises of things not agreeing with our theories right now. So it feels like we’re at a crossroads. There are problems like the fine tuning but there’s also problems in our observations. There are lots of things which are pushing on our standard ideas, our standard models of how the universe works. And that’s kind of exciting. It’s exciting to live in a time when it feels like there’s something new just around the corner. We are waiting for that next Einstein, I guess, to come along and reveal to us some deeper insights about the universe or at least I hope someone like that or a team of such people could come along and reveal that to us.

Part 4: My Own Thoughts

I want to acknowledge that I believed in God on other grounds long before I ever heard the phrase fine-tuning. I imagine myself as firstly a human being in relation to God (religious), secondly a human being engaged with other humans (social), thirdly a human being grounded in human culture and human concerns (as manifested, in part, by my engagement with the humanities), and only fourthly an amateur scientist. At least, this is, in my view, the proper order of things.

In accordance with human nature, people who believe in God tend to interpret the evidence of fine-tuning as supporting their belief (correctly, in my view), while those who disbelief in God find ways to explain the apparent fine-tuning without invoking design or else making the design technological instead of divine. But there are, nonetheless, a small group of former atheists for whom the fine-tuning argument has been helpful in enabling their conversion to theism.

I also want to concede, out of the gate, that the probabilities involved in this argument are impossible to calculate precisely, and they might well turn out to be less astonishing than they appear when we understand things better. The nature of the early universe and the big bang is disputed within the scientific community. Also, life, even complex life, might be possible in conditions in which current science would not predict that it would be possible. It is difficult to imagine any possibility of biological life in a helium universe. It is difficult to imagine life emerging in the heart of a star–but who knows? Certainly, though, as the Actual Scientists point out in their podcast, there is no empirical sign, so far, that life has actually emerged anywhere else.

Despite the foregoing, I think we are still entitled to evaluate, as best we can, the probability of life as we know it, and it seems to me that we have something of a Russian doll situation here: immense improbabilities within even bigger improbabilities within truly unimaginable improbabilities. The laws of physics themselves being delicately balanced to enable complex, stable structures, the low-entropy of the early universe, the formation of a planet that self-maintains its own habitability, the origin of living, self-replicating cells. Indeed, to mix the metaphor up, it is as if we found a perfect Russian doll growing on a tree.

Some thinkers object to the assertion that the physics of the universe (the outer layer of the Russian doll) is improbable, because (1) we don’t yet understand fundamental physics well enough to say whether it is improbable and (2) the physics of the universe and/or the big bang are so fundamental that they should be treated as givens–the grounds of probabilistic calculations about things within the universe as we know it, but not themselves objects of probabilistic calculation.

I don’t find these objections particularly convincing, but even setting aside the apparent improbability of a universe that supports life, and taking the laws of physics as given, we have within that universe a highly improbable Earth that has an astonishing ability to maintain life-supporting conditions with sufficient stability for evolution to take place over billions of years despite major perturbations. Not only does it maintain the conditions for biological life, but it maintains diverse habitats that are at once intricate and robust, beautiful and durable, interesting and providential–an inexhaustible object of study and inspiration as well as a beautifully decorated and well-stocked home for the human race and its companions, complete with a vaulted, transparent ceiling, running water, stone walkways, and lush carpets. And life somehow came along at just the right time to co-create, inhabit, and help maintain it.

To my mind, all of these facts almost compel acknowledgement of a Creator who intended the creation to house intelligent life. There just has to be some explanation for our wonderfully favorable circumstances as a universe, as a planet, and as a species, and intelligent design seems to me the best option. My intuition is that this theory is by far more elegant and intrinsically probable than the multiverse theory or the simulator theory.

Not only do I personally find the multiverse theory and the simulator theory strange and counterintuitive, but they also, to my mind, smack of elitistism–a refusal to take seriously the possibility that the illiterate masses of history were, as a whole, more correct about the fundamental structure of reality than have been the tough-minded, dismissive communities of the ivory tower. These theories seem to me like upstart newcomers to a very old conversation, and I suspect that many who favor them do so precisely because they are new and “scientific” in flavor–which is to say, materialistic. They are, so far at least, no more subject to public proof or disproof than the “original” theory of divine creation that the majority of humanity has always believed.

I am a novice in this field–where sharper minds than mine have spent years studying and arguing for or against the fine tuning argument as an evidence of God. Possibly someone else has raised the “elitism” objection, but, having now browsed a handful of articles on the subject, I have not seen it. I assume that is because science as a discourse is legitimately opposed, methodologically, to non-scientific traditions receiving deference in the search for truth, and the proponents of the fine-tuning argument for intelligent design take pains, for obvious rhetorical reasons, to color within the lines of scientific methods and discourse. But for me, a traditionalist in the sense of G.K. Chesterton, the argument is compelling. As he puts it in Orthodoxy:

It is quite easy to see why a legend is treated, and ought to be treated, more respectfully than a book of history. The legend is generally made by the majority of people in the village, who are sane. The book is generally written by the one man in the village who is mad. Those who urge against tradition that men in the past were ignorant may go and urge it at the Carlton Club, along with the statement that voters in the slums are ignorant. It will not do for us. If we attach great importance to the opinion of ordinary men in great unanimity when we are dealing with daily matters, there is no reason why we should disregard it when we are dealing with history or fable. Tradition may be defined as an extension of the franchise. Tradition means giving votes to the most obscure of all classes, our ancestors. It is the democracy of the dead. Tradition refuses to submit to the small and arrogant oligarchy of those who merely happen to be walking about. All democrats object to men being disqualified by the accident of birth; tradition objects to their being disqualified by the accident of death. Democracy tells us not to neglect a good man’s opinion, even if he is our groom; tradition asks us not to neglect a good man’s opinion, even if he is our father. I, at any rate, cannot separate the two ideas of democracy and tradition; it seems evident to me that they are the same idea. We will have the dead at our councils. The ancient Greeks voted by stones; these shall vote by tombstones. It is all quite regular and official, for most tombstones, like most ballot papers, are marked with a cross.

I love this G. K. Chesterton quote, and perhaps I delight a little too much in its overwhelming and disarming wit. It may go a step or two too far—because, for my part, I still give a lot of credence to some experts, scientific and otherwise, even against the majority, within their legitimate fields of expertise. But as applied to this particular controversy, I think the traditional belief in God as creator, held by vast majorities of the dead and living, deserves deference above the multiverse or simulation theories, particularly as it pertains to subjects (metaphysics and theology) in which there are as many expert opinions as there are professed experts, and in which common sense and “the human heart by which we live” may well be better guides than all the textbooks ever written.

There are of course legitimate philosophical objections to God as explanation–the problem of evil, the illegitimate form of the “God of the gaps,” etc. But I do not think there are good scientific objections. To requote the paragraph from the podcast that is most significant for this essay:

If I understand this objection to divine design, it is that even if God did it, you still have to explain why God could do it. The implicit premise is that everything should ultimately be explicable by science. But that premise finds no support in science, and I think most philosophers would agree that science itself has intellectual premises (e.g., a form of empiricism, including the reliability of sense data and the possibility of objectivity) and is thus epistemologically situated within a broader philosophical context. Some answers, at least, must come from outside of science–at a minimum, those that are presupposed by science cannot themselves be supplied by science.

The phrase “which doesn’t really satisfy anyone” is also troubling. The simulator explanation surely satisfies very few people, but the God explanation satisfies many people, including me. I agree that it raises additional questions, but so does most every discovery in any imaginable field of inquiry. The claim that the God explanation doesn’t really satisfy anyone should be translated as “it does not satisfy the community of elite scientists.” (Roughly a third of scientists in America believe in a personal god, and half believe in some higher power, but the elite tiers of science become dramatically more atheistic.) I’m willing to give Grant Lewis some grace here–he was speaking off the cuff, and we all have a tendency in unguarded moments to mingle in our minds the concept of “the communities of discourse that I care about” with the concept of “the communities of discourse that matter” or even with the concept of “the communities of discourse that exist.”

But if this quote, for all its unguardedness and verbal spontaneity, may be taken as representing the ethos of the scientific community, then it is not just in its verbiage but in its core content that it exposes how far the scientific community has progressed in its self-absorption. Newton wrote, “the main Business of Natural Philosophy is to argue from Phaenomena without feigning Hypotheses, and to deduce Causes from Effects, till we come to the very first Cause, which certainly is not mechanical.” In a similar vein, Einstein wrote, “My religion consists of a humble admiration of the illimitable superior spirit who reveals Himself in the slight details we are able to perceive with our frail and feeble minds.” Newton and Einstein–perhaps the two thinkers who did the most to advance science’s ambition to explain the movement of heavenly bodies in clear, simple equations–had no pretension that their elegant equations were the final word on the subject, capturing the ultimate cause of things. Yet it appears that the current consensus of elite scientists is that science should or will provide the last word on why reality is as we find it. I would urge that the shift in intellectual temperament characteristic of the man of science in the last hundred years or so is not the product of evidence (scientific or otherwise) but is rather the product of contemporary specialization and departmentalization, the resultant intellectual narrowness of the scientific community, and certain trends in history and politics. (I don’t claim the podcast participants are guilty of intellectual narrowness, to be clear. I refer to the community of scientists as a community of discourse, and it is the victim of larger trends.)

With regard to the trends in history and politics, I’m afraid we religious people have ourselves at least partly to blame for the typical hostility of contemporary science towards religious discourse. The recent pandemic supercharged the political tension between “science” and “religion,” to the extent that both are applied (or misapplied) to domestic policy, but that tension already existed, in both practical and theoretical realms. It has been mounting in America at least since the Scope Monkey Trial and the advent of fundamentalist Christianity as a political force in opposition to certain changes seen (sometimes accurately) as scientifically driven. Now both science and religion are sadly politicized, and, as a general rule, neither tends to have adequate respect for the competing claims of the other. We religious people have not always been the model of warm, open-minded curiosity, and we are not always willing to follow the evidence wherever it leads. Of course, this latter fault is mostly a characteristic of people in general, not of religious people specifically. But religious people have some additional reasons, in certain cases, to push back–some of them entirely legitimate (e.g., we accept other equally important kinds of evidence) and some of them less so (e.g., we become entrenched and dogmatic).

All people pick and choose what they attend to and develop attunements that both reveal and conceal the world and incline them to certain opinions and away from others. That is a fundamental characteristic of human perception. But it is an intellectual virtue to at least strive for consistency in one’s opinions. A twin virtue is engaging all of the evidence as best we can, not just the evidence that supports our preconceptions.

In this vein, an atheist scientist would be legitimately annoyed with me if I were to advance all of these scientific evidences of fine tuning as a probabilistic proof of divine design and then turn around and reject scientific evidence as soon as it came into conflict with a literal interpretation of the book of Genesis. We can’t have it both ways.

If God created the heavens and the earth, as both Genesis and fine-tuning attest, then, if we accept the evidence of science, he apparently went about it in a very gradual and a very odd manner, at least from a human perspective. Rather than speaking the world into existence in a week, as a literal interpretation of Genesis proposes, the prevailing scientific account suggests that he set certain laws to govern matter/energy and space-time, orchestrated the big bang (either using newly created matter, as Christian convention has it, or preexisting matter, as Joseph Smith taught), and then coaxed creation, one galaxy, one supernova at a time–and then one amoeba, one DNA strand at a time, towards the “sixth day” of creation when a creature in his image finally emerged from the trees, 13 billion years after the big bang and several billion years after the first living cells on Earth. It seems to not only have been superlatively gradual, but also quite violent: the loss of the majority of all life forms that have existed evidently is an acceptable side effect of the starvation- and predation-driven mechanism (evolution) that science confidently asserts was the primary means (i.e., God’s primary tool, from the present perspective) by which species were made to diversify and progress in complexity, intelligence, and capacity for cooperation and sociality. And, so far as we can tell, he left an incredible amount of space empty of life. The theology that appears to me to be the best intuitive match for the story science tells, at least post-early-universe, is process theology–and even process theology would, perhaps, predict that if intelligent life was the sole goal of the creation project, or even a primary goal, that life would be found a little more abundantly than it seems to be.

These last points are offered by way of cautioning the religious reader not to be too glib or too triumphalist with this fine-tuning argument. There is plenty of room for intellectual humility and epistemological modesty on all sides. The scientist and the theologian alike have plenty of questions to struggle with in light of the evidence of fine-tuning and the current state of scientific theory and evidence.

But to return to the podcast and the materialism that it implicitly favors, it strikes me that the Actual Scientists are, in the most innocent way possible, allowing their humanity to be murdered (at a strictly intellectual level) by their scientific methodology. Let me explain what I mean. David Kipping reports that he has been lying awake at night troubled by the fine tuning of the universe and the Earth and hoping that some “next Einstein” will come along who will explain everything and resolve the question once and for all. Implicitly, he anticipates that this next Einstein will be a scientist and that the explanation will be purely scientific and materialist. I take it that Mr. Kipping will rest easily once reality is fully explained in scientific terms, the apparent wonder of our universe’s incredible structural diversity and complexity reduced to a grand unifying equation that renders not only the physical universe but also human consciousness and perceived spirituality inevitable.

As a scientist, that is exactly what Mr. Kipping should strive towards. Science is and probably should be methodologically materialistic, at least until it comes to final causes and ultimate questions. But it should not confuse this provisional methodological materialism with materialism as such. As a human, Mr. Kipping should hope that science never succeeds in this totalizing project. As a human, it is mere rationality to hope that some benevolent higher power is ultimately in control of things, that higher meanings exist, and that the concepts that order our moral universes, like justice and love, are not merely pro-reproductive figments of our collective imagination—evolutionarily induced hallucinations. Applying a utilitarian standard, an aesthetic standard, or any other conceivable standard that I can imagine a fully sane human wholeheartedly embracing, it is a better universe for humanity and for all sentient beings if these things are true, and especially the first–God being at the helm.

It is not an illegitimate form of the “God the of the gaps” to demand that this entity, if it exists, must explain something–must be the cause of something. And therefore, the other causes that exist, including all laws of nature, if any exist independent of God, must leave something unexplained and uncaused, or else they would leave no room for God.

I expect Mr. Kipping is a “good person”—he doubtless pays his taxes and interacts politely with others and strives to fulfill his various duties. I admire his intellect and his work, including especially his podcast that (like this essay) seeks to bring the discoveries and the mysteries of science into conversation with normal people and human concerns. Yet I think it would be irrational to join him in his professed hope that evidence of God will be explained away in a reductionist, materialist manner.

To conclude, let me add one more evidence of fine tuning, or rather a meta-evidence. It strikes me as intrinsically improbable that, having brought forth intelligent life, a universe with no God would thereafter present itself to that life as neither transparent nor opaque but translucent, in terms of our ability to comprehend it–and translucent, furthermore, in a manner that steadily decreases in opacity in response to human effort, without ever becoming fully transparent. We have been steadily learning about our universe for many thousands of years now, including over 400 consecutive years of concerted efforts by large communities of scientists applying the same methodology that science still uses. The universe has steadily surrendered its secrets, and yet its fundamental nature still eludes us, and we are, if anything, aware of more mysteries today than we were in Galileo’s lifetime. It seems remarkable that there has been so much field for the universe to concede and yet so much more still left unconquered—that humanity’s path from ignorance to knowledge should be quite so winding and arduous, and that this should hold in seemingly every field of inquiry. Yet if the path is arduous, it is also exhilarating. It is as if God set humanity a series of intricate, inexhaustible puzzles, the partial solving of which is part of our collective assignment and an intended source of delight. If so, it seems to imply that God cares about intellectual effort, and that one way to serve him, even unwittingly, is to help with the puzzles.

As C. S. Lewis points out, the ultimate question is not what we are to make of God but what He is to make of us. I would bet that in the great work of God in the world of the dead, preparing all human spirits for judgment day, God’s messengers, speaking in the power of his Spirit with many souls who in life were atheist scientists, will warmly commend them for their labors, even as they might gently reprove them for their failure to discern God’s fingerprints in the structure of creation.