Fine-Tuning: The Argument That Won’t Die

Posted on June 3, 2026 by Sci Fi Engineer

The universe shouldn’t work.

That’s not a philosophical position. It’s an engineering observation. The constants that govern how matter behaves (the strength of gravity, the mass of the electron, the rate at which the universe expands) are set to values so specific that adjusting any of them by a fraction of a percent collapses the whole structure. No stars. No chemistry. No time long enough for anything to happen. The tolerances are absurd.

Physicists call this fine-tuning. The name is polite. What they mean is: the odds against this universe are so extreme that “chance” stops being a useful word for it.

The Two Escapes That Aren’t

Two answers dominate the debate, and neither is as clean as its proponents pretend.

The first is design. Someone set the dials. The universe looks like it was built for life because it was built for life. The problem is that this explains nothing mechanically; it just relocates the question one level up. Who built the builder? And why does a universe designed for life consist of 99.9999% lethal vacuum, with life confined to a thin biological smear on one unremarkable rock?

The second is the multiverse. If you generate enough universes (some versions say 10 to the power of 500, which is a number that has stopped meaning anything), eventually one rolls the right numbers. We’re in that one because we couldn’t exist in any other. This is the Weak Anthropic Principle: we observe what permits our observation. True, trivially. It explains why we’re here without explaining what set the parameters. It also requires an infinite number of unobservable universes as its load-bearing assumption, which puts it in the same epistemic category as the thing it’s trying to replace.

Both positions treat the constants as prior: fixed before any observer arrives. That assumption is where the argument gets interesting.

The Observer Problem

Quantum mechanics has an unresolved problem at its core. A particle exists in a superposition of states until it’s measured. At the moment of measurement, it resolves to one outcome. The math is exact. The mechanism is unknown. Why does observation collapse probability into actuality?

Most physicists park this question and get on with the calculations. A few take it seriously as a clue about the nature of reality.

John Wheeler spent decades on it. His conclusion, which he called the Participatory Anthropic Principle, was that observers don’t just record the universe; they bring it into being. Not metaphorically. Retroactively, through the act of observation, the universe acquires a definite history. Without observers, there is no collapse, no resolution, no definite past. The universe requires participants to be real.

QBism (quantum Bayesianism) pushes this further. The wavefunction isn’t a property of the universe out there; it’s an agent’s belief-state about what they’ll find when they interact with it. Reality is co-created at the moment of contact between observer and system. There is no view from nowhere.

These aren’t fringe positions. They’re minority positions within a field where the majority hasn’t solved the measurement problem either. The standard interpretation (Copenhagen) essentially says: don’t ask. The wavefunction collapses when observed. Move on. That’s not an answer, it’s a professional courtesy.

What We’re Actually Arguing About

The fine-tuning debate has lasted this long because it isn’t really a physics debate. The physics is genuinely unresolved, but the heat comes from elsewhere. Fine-tuning is a mirror. It reflects whatever you bring to it: the theologian sees confirmation, the materialist sees a threat, the philosopher sees an infinite regress.

What it actually is, stripped of the freight, is an open question about the relationship between observers and the reality they observe. That question is at the center of quantum mechanics, unsolved after a century. Anyone who tells you they’ve answered it (with God, with the multiverse, with consciousness) is telling you more about themselves than about the universe.

The constants are what they are. The blueprints are still inside the control room. We’re standing outside, listening to the machinery run, and arguing about what the building is for.

The Inversion

I write sci-fi. I often start with a “what if” and build a universe from there: its physics, its rules, any departures from today’s starting point, then the situation, the characters, and let the story build itself. I discover the story a bit like you do when reading it.

Taking the above as a starting point: what if the constants aren’t set in advance? What if consciousness and cosmos co-emerge, and the tuning is the relationship, not the precondition?

The standard framing puts observers at the end of a long causal chain: universe forms, constants happen to permit chemistry, chemistry permits biology, biology permits minds. Fine-tuning is the mystery at step one.

The inversion says: the chain runs both ways. The universe doesn’t pre-tune for life. It and life arrive together, and the constants we measure are not prior constraints but the record of that co-emergence. We don’t observe a fine-tuned universe. We participate in one.

This has a strange implication for the Fermi paradox. That paradox asks, why, given a universe old enough and large enough to have produced intelligence a thousand times over, do we seem to be alone in our corner of it?

The standard answers are grim (they’re dead, they’re hiding, travel is impossible) or optimistic (we’re early, they’re out there, we haven’t looked hard enough). The inversion suggests something stranger: each consciousness-cluster tunes its local physics. Not deliberately, not by choice. By existing. The region of space we occupy is already, in some structural sense, spoken for. Other intelligences don’t fail to appear nearby because they never had a chance to evolve. This doesn’t rule out life; it says intelligence has an even higher evolutionary mountain to overcome. It can happen, but the positioning required is exquisite. Intelligence is separated by immense time and space by definition.

Light speed remains the speed limit of natural change (at the Planck foam level, tuning can propagate no faster). The observable universe is many billions of light years across. Other consciousness-centers can evolve concurrently (whatever “at the same time” means across cosmological scales) and as their influence zones expand and eventually overlap, they settle toward equilibrium. There’s no reason other intelligences haven’t evolved, won’t evolve. They just do so in ways that place them very far from each other. If they’re too orthogonal to reconcile, the incompatibility itself forces a fork: a separate universe instance where both can exist without contradiction.

The Soft Edge

If the constants are the product of co-emergence rather than prior fixtures, they can’t be infinitely rigid. The consciousness-affected zone is vast, maybe millions of light years across, but we can see vastly further than that. The universe across its whole breadth had to have had us as a possibility from the first, so it will be largely coherent. But at the very edges, looking out into reaches beyond our tuned zone, we might see the occasional wobble against our expectations. We do see things we can’t explain. Maybe that’s one reason.

There also has to be some original malleability in the underlying structure. At the Planck length, if our theories are even close, that’s where it would live. Once set, some mechanism, some momentum, holds things together. What that is remains open. But the what-if builds from here: what if minds operate in a non-deterministic state because we evolved a mechanism that makes us more than puppets of causality? What if that mechanism could be amplified? Could the universe, at small scales, be nudged by will, by perception: a natural ability turned up just enough to matter?

The rules of physics we measure in our tuned pocket are local, not universal. Outside them, things are possible that our physics would classify as impossible. Not because the laws of nature have been broken. Because the laws in that region haven’t fully hardened.

This is what a rigorous theory of magic would look like. Not violation of physics. Physics that hasn’t finished resolving.

This isn’t a claim about how the universe works. It’s a coherent frame, reasonably consistent with what we don’t know about quantum measurement and observer participation, and more interesting than either of the standard escapes.

A novel I’m working on takes this seriously as a premise. It builds from the cosmology down to the plot: what happens when a civilization discovers this reality, and what it means that others in distant galaxies may have known it for a long time and have reason to worry about a new competitor.

The adventure and space opera come with the territory. But the physics is the foundation.

What if our physics is contingent rather than absolute?

If You Want to Pull This Thread

John Wheeler, “Information, Physics, Quantum: The Search for Links” (1989). The paper where Wheeler lays out “It from Bit” and the participatory universe. Dense, but the original argument in his own words.

David Deutsch, The Fabric of Reality (1997). Makes the case for the multiverse more rigorously than most popularizations, and is honest about what it costs philosophically. Good for understanding the strongest version of the position before deciding what you think of it.

Chris Fuchs on QBism. His papers are technical, but his interviews and lectures are accessible. Search “QBism Fuchs” and find a talk. The core idea (that the wavefunction is an agent’s belief, not a fact about the world) takes about twenty minutes to understand and longer to shake.

Nick Bostrom, Anthropic Bias (2002). The most careful treatment of observer-selection effects and the anthropic principle. Dry, rigorous, and it will make you distrust every argument in this space, including the ones in this post.

Tags: physics, philosophy, cosmology, fine-tuning, quantum mechanics, consciousness, Fermi paradox

📺 YouTube: The Unretired Engineer | 🔗 LinkedIn | 📚 Published works — M.A. Harris

Andy Weir’s Genius in Project Hail Mary

Posted on April 9, 2026 by Sci Fi Engineer

Andy Weir has a rare gift: he writes ordinary people — genuinely, recognizably ordinary — who have a skill that is also recognizable, and then puts them in situations where their one extraordinary competence is the only thing standing between them and death (in the case of Project Hail Mary, the extinction of the Human race.) The heroism is quiet and technical and you could almost believe that you could do that in the right circumstances.

You believe it because he’s made you believe in the person first. I saw the movie. I read the book years ago. Both are excellent, and the movie is one of the most faithful book-to-screen adaptations in recent memory.

Like The Martian before it, the film sticks closely to the book in both thesis and spirit. That fidelity matters: both stories rely on the reader/viewer trusting that the protagonist’s problem-solving is real, not movie-magic. Break that contract and the whole thing collapses. Weir earns it on the page; the filmmakers preserved it on screen.

The one genuine gap between novel and film is interior monologue. Novels handle internal states naturally; movies almost cannot. But Weir constructs scenes that externalize internal conflict visually — and those translate superbly.

A couple of minor side arcs from the book are absent, and I think those were wise cuts. They deepened the protagonist on the page but would have felt excessive at feature length.

One thread that bothered me in the book and still bugs me in the movie: Ryland Grace is pulled into the program because in his post-doctoral research he had proposed that alien life does not require water and carbon — and had defended that position to a career-ending degree. When the AstroPhage is first discovered it appears very alien, so Grace is brought in for initial analysis. He then finds it’s made of the same materials as Earth life — which undercuts his entire reason for being there and threatens to sideline him. That it doesn’t is a good twist; go see the movie or read the book for how it resolves.

Here’s where my engineering brain creates further friction. The AstroPhage’s energy density is extraordinary, and the novel acknowledges this and hand-waves it away. I cannot see how any life form built on biology similar to our own could handle those energy levels — it feels bolted in, even if it probably wasn’t. Similarly, Rocky — the alien Grace meets at the target sun — turns out to be exactly what Grace originally proposed: a non-water/carbon life form, which feels a little convenient in vindicating him.

There are complaints about Rocky delivering a specific thematic point about first contact and communication. My view is the opposite (other than the niggle above) that whole piece is brilliantly on point and there would not have been much of a story without it.

None of that diminishes what Weir achieves. He takes relatable people with very human quirks and puts them in situations where they have to fight to survive — and we root for them completely. And here i put the very alien Rocky in the bucket of people…he is about the best alien I have seen in a move ever. I wish I were half the author he is, and I say that as someone who is trying. Project Hail Mary is the rare book where you finish it and immediately want someone else to read it so you can talk about it. The movie earns the same feeling. Go see it.

The Physics Produced the Ship

Posted on March 30, 2026 by Sci Fi Engineer

Most fictional spacecraft are designed backwards. The writer decides what the ship needs to do dramatically, then invents a reason it can do that. The result is technology that serves the plot. Which is fine, until you need it to do something different in book three, at which point you quietly bend the rules and hope no one notices.

Engineers don’t do that. Not because we’re more disciplined — because we can’t. You don’t change the spec because the schedule is tight. You re-examine the architecture or you live with the constraint.

That instinct, applied to fiction, produces something different.

The principal auxiliary warship in the Sea of Suns universe is called a Dagger. Here’s how it got its name — and it wasn’t because I thought “dagger” sounded good.

The Transit system — the FTL drive in this universe — works through a rail. The rail is a linear gravity generator that manipulates quantum foam to open a wormhole large enough for the ship to pass through. The rail controls volume you can push through: the more mass you want to move between stars, the more rails you need. Compute controls speed: the transit step is a calculation, and the faster you want to step, the more computing capacity you need.

That trade-off isn’t decoration. It’s the architecture.

An auxiliary warship needs to be fast. In this universe, fast means compute capacity. Compute capacity takes up volume inside the vessel. So a fast warship is, almost by definition, a ship that has traded its interior for processors. Twin rails — enough to move a meaningful crew and weapons load — with almost every remaining cubic metre given over to compute. Crew of two to five on a thousand-foot vessel. Not much else aboard.

Now you have a ship that’s fast, carries almost no cargo, and spends all its operational time in real space. Real space means it’s detectable. A detectable warship needs stealth. The most effective passive stealth for a vessel in this universe is minimising cross-section — flat surfaces, minimal radar return. You sheath the hull in flat panels that force the profile into a long, slender blade shape.

The name isn’t metaphor. It’s a description of what the physics produced.

I didn’t design a cool warship and retrofit a justification. The constraints generated the vessel, and then the vessel generated scenes I hadn’t planned, because once you know what a Dagger can and can’t do, certain tactical situations become inevitable.

That’s the engineer’s advantage in hard SF, and it’s not what most people think it is.

It’s not technical accuracy. You’ve invented the technology — accuracy isn’t really the point. It’s that engineering training gives you a specific habit of mind: ask what the constraints produce, not what you need them to produce. Follow the logic. Let the system build itself.

When the system is honest, the world it generates is consistent without effort, because everything follows from the same rules. The Dagger’s tactical role, its crew size, its limitations, the scenarios it enables — none of that required invention. It came out of the trade-off.

The reader doesn’t need to understand the Transit physics to feel that the Dagger is real. They just need to encounter it behaving consistently with itself across the whole story. That consistency is what creates the texture that makes a fictional universe feel inhabited rather than constructed.

Thirty years of engineering taught me that coherent systems generate their own logic. Turns out that works in fiction too.

Why Engineers Write Better Hard SF is on The Unretired Engineer YouTube channel —

Stranded in the Stars, Book One of the Sea of Suns Trilogy, is available on Kindle. The Dagger appears early and often. https://www.amazon.com/Stranded-Stars-M-Harris-ebook/dp/B0GT123PLP

Go and See Edge of Tomorrow, it Rocks!

Posted on June 16, 2014 by Sci Fi Engineer

The hero and her sidekick Tom Cruise

Edge of Tomorrow is a kick ass science fiction action flick. GO AND SEE IT IF YOU HAVEN’T ALREADY!!!!!

It is action packed, actually makes sense (in science fiction terms,)has a quirky dark military sense of humor and an odd quirky dark romantic subtext (to me who loves warrior women [and my wife].)

OK Groundhog Day and that episode of Stargate did the reliving the 24hours bit before but not with the firepower (literally) of this movie.

I love the fighting machine, its direct line descent from what we are seeing in progress today and it certainly give the heroes a rational ability to carry REALLY BIG GUNS!

Emily Blunt is the hero here though the action revolves around the time looping Tom Cruise character. Right now I think she’s better than Sigourney Weaver’s Ripley from Aliens because she is not so much reacting heroically to the demands of the moment as displaying long-term self-control and holding onto hope long after knowing the chances of survival are in the hands of pure chance.

SPOILER ALERT: DO NOT READ BEYOND THIS POINT IF YOU HAVE NOT SEEN THE MOVIE AND HAVE ANY INTEREST IN GOING.

The aliens have invaded, 4 years ago, worse, they’re winning.

Tom Cruise’s character, a slimy salesman in uniform, pisses off the Allied high commander and gets assigned to the invasion force getting ready to push the aliens back from the beaches of Normandy (D-Day with choppers.) It all goes terribly wrong and TomC gets killed in the first few minutes, along with pretty much everyone else. But he’s not the utter waste of humanity you first thought. In a final act of bloody-mindedness he takes an alien commander with him, setting off a time loop around his last 24 hours (which the aliens had set up so they got the advantage of do overs.)

Rita (Emily Blunt’s character) was killed early on during an earlier great battle in similar circumstances. In a series of many hundreds of do overs she finally has enough of an effect to win the battle though she cannot in the end get to the alien’s core (the Omega) and destroy them. It is never stated in so many words but it is obvious that she learns from, and works with another soldier in this repetitive nightmare, falling in love with him but never able to save him. At some point after the battle, probably trying to find a final solution, she is wounded in combat and given a transfusion, which destroys the looping.

By that time she is the new Sampson, Hercules, Sergeant York, Audey Murphy…but damned now to live and die just once she has to try to find a way to counteract the aliens’ undetectable, undefeated advantage. Her friends dead or discredited she has to grit her teeth and allow herself to be used to recruit cannon fodder, in the hopes that somehow, she can help stave off defeat and find a key to victory.

My read of Rita is that she is very near the breaking point by the time the too cute TomC character pops into her life. Not given the advantage of looping with her guide, each time she has to accept, come up to speed and move out with him each and every time, and it looks hard for her.

The TomC character Major Cage, starts out as a near total waste of oxygen, but his act of rage that sets up the loop is an act of redemption. And somehow, with backsliding, he keeps the redemption train moving. When Rita first meets him I’m fairly sure she’d really like to pull his head off to see what goo is inside. But as time progresses he earns her trust (remember this is over a period of less than 24 hours for her) and finally a little bit more.

It’s fairly obvious that Cage falls for Rita, physically at first (Blunt is Valkyrie hot) and then in a far deeper way (after the first several hundred deaths or so) and is also convinced that she (and her mad scientist friend) is the key to not having to die for good eventually.

At the end of the movie they die…after their first (and only) kiss, but the loop acts one last time to toss Cage back to an even earlier beginning, the beginning of a new age as the aliens have been destroyed though nobody has any idea what happened.

Last Scene, Cage in his noncombat officer finest faces the still burnt out and very dangerous Rita but now he is a seasoned warrior under the glow. He has seen her die many hundreds of time, almost every time knowing that her death was the death of any hope except for his death and a do over. She is seeing him for the first time, again.

I’ve spent hours thinking about the pick up line after the fade out. One does not know what will happen, “Hi Rita you don’t remember me but we blew up the alien Omega together. Just dropped by to thank you for saving humanity with my help, I wanted you to know that seeing you die several hundred times was a real bitch and dying that last time, I was glad I wasn’t going to survive without you. Could I take you out for a cold beer and pizza later?”

OK so that’s corny but I bet there are hundreds, if not thousands, of others wondering the same thing.

Review: Man of Steel

Posted on June 23, 2013 by Sci Fi Engineer

My son and I went to see Man of Steel yesterday and thoroughly enjoyed it. In my opinion ‘Hollywood’ for all the damning it/they take these days is/are in fact incredibly good at making movies that the ‘public’ like me enjoy, see: Star Trek into Darkness, Iron Man III, Oblivion, etc, etc….I will agree that they are not so good at making movies that spark movements, deep introspection, change hearts, etc but the working stiffs out here in the real world can only take so much of that (near zero in my case since I suffer internet news triggered navel starring disorder class one to begin with and go to the movies to get away from the world not to get hammered from one more angle by it .)
Other reviews:
http://booksforkidsblog.blogspot.com/search?q=Man+of+Steel
http://www.npr.org/2013/06/13/189284063/steel-trap-snyders-superman-between-worlds
http://arstechnica.com/gaming/2013/06/man-of-steel-review-a-surprisingly-human-superhuman-story/
Henry Cavil …Clark Kent / Kal-El. Great choice
Amy Adams …Lois Lane. Fun to see
Michael Shannon …General Zod Great choice, great part, good man in evil cause
Diane Lane …Martha Kent Yes!
Russell Crowe …Jor-El Wow!
Harry Lennix …General Swanwick Good pick
Richard Schiff …Dr. Emil Hamilton Good pick
Christopher Meloni…Colonel Nathan Hardy Good pick
Kevin Costner …Jonathan Kent Oh Yeah!
Laurence Fishburne …Perry White Great supporting role

This is a very good movie despite what some say, though things that I think make it stand out perhaps ruin it for others. It has now been said many times, this is, at its core, a Science Fiction, not a genre Super Hero, movie and that core is very, very good. Man of Steel takes the Superman back story, fleshes it out and draws it out into a fully imagined prequel to the superhero of our childhood. This story of his birth and orphaning to Earth is striking and heart felt.

An artist without the commercial drivers of movie making and IP dollarization might have been able to stop there without much, if any, Super Hero baggage, leaving us with what might have been a timeless piece of work.

What I see as the problem is that the ‘execs’ felt they needed more than a good science fiction movie based on the Superman back story. They wanted a summer blockbuster super hero movie. So the creators gave them a summer blockbuster SciFi blow em up of the Independence Day sub genre and a Super Hero movie of the Spider-Man genre. They then proceeded to lace these pieces together with the science fiction piece, quite successfully mind you, into Man of Steel.

The three movies in one do actually make an entertaining whole with the core Science Fiction story providing gravitas. The other two parts do their thing though too often when two or three of the ‘bits’ have to overlay, things seem to get spoiled.

As said elsewhere some of the action sequences particularly around the Kent’s home town are too drawn out and there is something almost bug like about the super speed fighting that takes you out of the moment.

In the long battle scenes in ‘Smallville,’ Metropolis, even on Krypton, the humans and normal Kryptonians in the battle zone get squished/slaughtered in bushel lots with very little comment. Yet when Zod forces superman to kill him, Cal-El seems incredibly distraught, as distraught as when his adoptive father stops Clark from saving him thus revealing his super powers during late adolescence.

Related side note: My son said he was glad that the creators had not ruined the ‘reality’ of the action sequences by showing repeated miraculous saves. And though from one view it’s a bit cold from my writers perspective he is absolutely right.

There’s a lot one could say about this movie, my bottom line, if you have hesitated to go due to one review or another my suggestion is go, (see the cheap regular version like we did, it’s excellent and I’ve come to the conclusion that 3D, IMAX3D, etc are not really worth the extra price.) The theater we went to was quite well filled for mid afternoon second week with other new starts, and the folks behind us had seen the movie at least once and perhaps twice before and still seemed ready to see it again after the show.

Cheers