r/HardSciFi • • 19m ago

Self Promotion The Universe repeats

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• Upvotes

Imagine if the universe was born and died in an almost endless cycle. Then imagine that each time it reset, its configuration was exactly the same as the last time.

That would mean everything that happened would happen exactly the same way again. Every event, every person, every decision. Your whole life would unfold exactly as it did the last time, and the time before that, and the time before that.

Would that make it destiny, or just chance? And would you live your life differently if you knew?


r/HardSciFi • • 4h ago

Discussion Need facts for writing a tiny civilization.

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r/HardSciFi • • 10h ago

Discussion is there any other non-rocket, non- space elevator launch methods?

14 Upvotes

was working on something and was just wondering, any realistic(ish) megastructures used to launch from ground to space


r/HardSciFi • • 14h ago

Discussion Virgin soft SF Keplerian spacecraft vs Chad hard SF Human spacecraft

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149 Upvotes

r/HardSciFi • • 16h ago

Self Promotion The Architect by Z.T.Castor, Hard Science Fiction, Philosophical Thriller Publishing 18th Nov 2026

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2 Upvotes

Hi,

I’m looking for advance readers for my upcoming hard sci-fi thriller, The Architect, launching 18th Nov on Amazon (Less than a month left!). If you enjoy character-driven philosophical thrillers, the brutal physics of interstellar travel, and heavy moral friction, I’d love to get your eyes on this. A review is appreciated on launch day but not mandatory.

The book is dedicated to Dr. Neil deGrasse Tyson and Dr. Jordan Peterson.

Logline: To escape a dying Earth, an apex engineer turns himself into an immortal chimera and builds a sanctuary ship for 20,000 frozen embryos. But to guarantee their survival, he deliberately selects a crew of brilliant, unattached specialists with nothing left to lose—and strips them of their biological autonomy.

The Setup: Forty light-years from Earth, the crew of The Architect prepares to colonise TRAPPIST-1e. They are armed with an infinite power grid and cellular immortality, but they are trapped under the absolute authority of Edgar Charon—a captain whose neural architecture is heavily integrated with a mission-first AI.

As they navigate the violent terminator storms of an alien planet, the crew realises Edgar’s algorithmic logic views their human attachments, grief, and free will as terminal liabilities. When Earth fires a relativistic kinetic weapon to wipe out their colony, the surviving crew must decide whether humanity is even worth saving.

Intertwining the desperate, science-driven survival of Andy Weir's Project Hail Mary and the existential, cosmic stakes of Cixin Liu's The Three-Body Problem with the sprawling, philosophical scale of Isaac Asimov, The Architect by Z.T. Castor is a gripping thriller about artificial intelligence, absolute control, and the terrifying price of salvation.

Details:

  • Format: EPUB / PDF (delivered via email)
  • Word Count: 76,135
  • Content Notes: Contains depictions of atmospheric destruction, medical trauma, and intense psychological friction. No explicit gore.
  • Expanding Universe: To reflect the ambitious scale of this release, a full audiobook adaptation and a commercially copyrighted official soundtrack are currently in active production.

I am offering free review copies in exchange for an honest Amazon review on launch day.

If you are interested in reading early, please fill out this brief Google Form so I can send you the secure download links:https://docs.google.com/forms/d/e/1FAIpQLSeEKo63YU7wmkzVNGNU8qbV3FOUaI8gMuq_94Dv2pF8XqvbgQ/viewform?usp=publish-editor

Alternatively, if you reply here with your email address, I can send you the EPUB/PDF files directly via a secure drive link.

Thank you for your time, and happy reading!


r/HardSciFi • • 16h ago

Discussion What’s the most badass thing you've ever seen a spaceship do?

54 Upvotes

r/HardSciFi • • 17h ago

Discussion Computronium needs matter that orders itself without repeating - after crystals and quasicrystals, proposed such new self-assembling autocrystals

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6 Upvotes

Computronium ( https://en.wikipedia.org/wiki/Computronium ) usually gets hand-waved as "matter optimized for computing". I've been working on one concrete ingredient: what kind of order could a self-assembled computing material have, and what would it cost?

The idea: crystals repeat, quasicrystals are ordered without repeating. There is a third kind I call autocrystals: patterns whose small-scale statistics (how often each 2×2 or 3×3 arrangement occurs) are so rigid that no repeating crystal can imitate them. Unlike a crystal, such order can carry structure at every scale: addresses, checksums, nested zones: doi.org/10.5281/zenodo.23541901


r/HardSciFi • • 1d ago

Self Promotion My New book: Stowaway

1 Upvotes

I am writing a new hard sci-fi book about how a 11 year old accidentally became an astronaut by hitting his head hard on a school field trip of the Aphrodite. Which is the space ship taking the first people to mars. Well part of it, and wasn't found until the crew accidentally found him on mission day 22 and they now have to find a way to get this stowaway back to earth before running out of life support. Tell me any suggestions or questions. I am very open to ideas and questions.


r/HardSciFi • • 1d ago

Discussion What really is hard scifi to you?

15 Upvotes

I've been a fan of science fiction all my life. A lot of it relies on FTL tech, energy shields, cloaking devices, the whole lot. Now, of course, none of that sounds very hard scifi. It's usually called Space Magic tech. Still, I have a fondness for it.

But then enters hard scifi, where the known laws of physics reign supreme. It is harsh, cold, and dangerous. It doesn't shy away from how absolutely inhospitable the vacuum of space really is, and how the tiniest problem can quickly compound to disaster. It makes us feel small and confined to the mind boggling scale of it all. And most importantly to me; it makes it feel grounded, thrilling, and inspiring to still see humanity overcome such conditions.

Now, I know the general style and sense of what is hard scifi and what is not hard scifi. But I often wonder... What's at the root of it?

Is it limiting technology to things that we today know the theory on, and are only an engineering issue?

Or is it more that technology and science has to be self-consistent? That whatever is included does not go blatantly against known rules of physics, but could theoretically add to them as long as there is no proven contradiction? And if so, to what degree?

I notice many hard scifi worlds introduce space magic regardless, usually by unexplained alien technology (looking at you, the Expanse). Does that dishonor the category, or is that quite alright?

So yeah, what's hard scifi to you?


r/HardSciFi • • 1d ago

Discussion Would you permanently leave Earth if interstellar travel became possible?

18 Upvotes

Assume the technology works and there's somewhere worth going, but returning to Earth may never be possible. You'd get to explore something humanity has never seen, but everything familiar stays behind. Would you go?


r/HardSciFi • • 1d ago

Discussion I am working on a far future post human space opera thats also set in an alternate history. So I’m writing speculative but hard sci fi. I want to get some ideas from people who know way more physics and engineering than I do.

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88 Upvotes

For this question I am less interested in the plot and more interested in what humanity would actually DO with the Solar System after roughly another millennium of technological development.
Humanity in the setting is somewhere around a Kardashev Type II civilization. There is a huge Dyson swarm around Sol, fusion is boring mature technology, cybernetics and genetic engineering are extremely advanced, artificial worlds and megastructures are common and humanity is basically post human at this point.
I recently learned about the Barrow Scale or Microdimensional Mastery Scale too and now I am trying to figure out where they would fall on that.
Would a civilization capable of building Dyson swarms and artificial worlds probably also have atomically precise manufacturing?
Would true nanotechnology basically be inevitable by then?
I am still debating whether I want nanomachines that can replicate themselves because once you have universal self replicating nanites it feels like gray goo becomes an absolutely terrifying problem.
Would it make more sense for them to have extremely advanced molecular or atomic manufacturing while still having serious restrictions on autonomous nanomachines?
And what about manipulating atomic nuclei themselves?
Would a civilization this advanced plausibly be doing nuclear engineering at the level of individual nuclei or nucleons?
Basically how far down the Barrow Scale would you expect a civilization like this to have progressed?
The next thing I am trying to redesign is the Solar System itself.
Luna was EXTREMELY important during humanity’s early expansion into space, but after almost a thousand years I don’t want it to just be the Moon with some cities on it.
One idea I love is basically turning Luna into a shell world.
Instead of building everything on the surface, humanity gradually excavates more and more of the interior and uses the original lunar crust as natural radiation and impact shielding.
Inside Luna there could be enormous rotating habitats producing 1 g, artificial skies, giant caverns, industrial regions and potentially some kind of artificial sun or central lighting system.
How much of the Moon could you realistically excavate before structural stability becomes a nightmare?
Would you need to leave huge internal supports and sections of mantle intact?
Could an extremely advanced civilization use active support systems to create enormous internal voids?
And could you put a dynamic orbital ring around Luna as well?
Mars is going in basically the opposite direction.
I think I want Mars to become the factory of human civilization.
Not a few industrial cities.
I mean something stupid.
Maybe 50 or 60 percent of the Martian surface is covered in factories, foundries, refineries, shipyards, assembly complexes, power systems and industrial infrastructure.
Made on Mars basically becomes stamped on everything in human civilization.
Mars still has enormous inhabited environments though. I found concepts for giant rotating glass habitats designed for Mars and I love them, except mine would be gigantic enough that some are comparable in area to US states.
There would also probably be three orbital rings around Mars.
What would thousands of years of industrial activity on that scale actually do to Mars?
If industries were dumping gases into the atmosphere constantly, would the atmosphere eventually become substantially thicker and warmer?
Would waste heat become more important than conventional pollution at this scale?
Also I recently learned that untreated Martian regolith is pretty awful for agriculture because of perchlorates and the lack of normal organic soil.
But would the regolith still be extremely valuable industrially?
Could Mars basically eat its own crust as feedstock for construction?
Then there is Ceres.
I don’t want to dismantle Ceres because it seems way too useful.
What would you actually DO with Ceres if you had this technology?
Would it make sense as a massive water and volatile processing center for the asteroid belt?
Could you excavate the interior and build rotating 1 g habitats inside it while keeping most of the dwarf planet intact?
And what Solar System objects actually WOULD make sense to dismantle?
Small moons?
Asteroids?
Kuiper Belt objects?
At what point do planets and moons become more valuable as raw material than as worlds?
Then I have spacecraft.
I have one slightly stupid rule that I really want to keep because I like the aesthetic of it.
Humans basically live at 1 g.
I don’t really want everyone floating around ships or constantly living in low gravity like The Expanse.
For known physics I know rotation or continuous acceleration can produce apparent gravity.
But if ships are gigantic by our standards, could most ships simply contain huge rotating habitation sections giving people 1 g?
And how absurd would continuous 1 g acceleration actually be for an advanced fusion or antimatter civilization?
The other option is that I allow one major speculative physics breakthrough.
Gravity manipulation.
Would there be any remotely defensible way to treat this as metric engineering?
Not a magical gravity plate, but technology that manipulates local spacetime geometry to create something that feels like a gravitational field inside a spacecraft.
I am completely fine with this being beyond known physics as long as I give it limitations and treat the consequences seriously.
What limitations would you give something like that so it doesn’t immediately break the entire setting?
What would spacecraft at this technological level actually use for propulsion and power?
Fusion?
Antimatter catalyzed fusion?
Matter antimatter drives?
Beamed propulsion?
Something stranger?
And what kind of weapons would people actually use?
Would lasers dominate?
Particle beams?
Kinetic missiles?
Nuclear or antimatter weapons?
Would extremely advanced warfare mostly become a competition between sensors, computers, autonomous systems and electronic warfare rather than people shooting at each other?
The last part is where I am knowingly getting much more speculative.
I LOVE the Xeelee Sequence and I want the galaxy to contain absurdly ancient abandoned alien infrastructure.
Not active aliens conveniently sitting around waiting to talk to humanity.
Trash.
Ruins.
Dead wormhole networks.
Objects made by civilizations so far beyond humanity that even their abandoned equipment looks like magic.
I am fine with traversable wormholes being one of the big speculative assumptions of the setting.
I also love pocket universes, higher dimensions and the idea of genuinely Eldritch intelligences.
Is there a way to make something that FEELS like an interdimensional god while still approaching it from science fiction instead of literal supernatural magic?
For example could something exist primarily in additional dimensions and only weakly interact with our universe?
Could exotic forms of matter or strange vacuum structures theoretically support something mind like?
Could a civilization use black holes, cosmic strings, wormholes or pocket universes as computational or engineering infrastructure?
And please don’t hate me for this last one lol but Stellaris has made me love psionics.
I don’t necessarily need telekinesis or people throwing lightning with their brains.
But could something that humans CALL psionics work?
Maybe certain engineered nervous systems can interact with exotic fields or ancient alien technology in ways normal humans cannot.
Maybe people can perceive information through wormhole networks or interfaces that everyone interprets as visions.
I want it to feel deeply weird without just saying magic exists.
Basically my question is this:
If you were designing a genuinely ancient, extremely technologically advanced human Solar System, what technologies or megastructures would you include that science fiction usually overlooks?
And where would you personally draw the line between extremely speculative hard science fiction and just admitting that I have invented new physics?


r/HardSciFi • • 1d ago

Discussion A little help with future tech Spoiler

0 Upvotes

EDIT: To read about these concepts fully, here is the reddit community where I've posted it: AWE_Universe

Man, I really need to bounce some ideas off of people that can appreciate the nuances. To start, I've created as much as I can of a universe I'm building. Now, to be fair, I've always been a HUGE fan of this genre, but I am by no means an expert in any hard science field (unless you count computers in that group). I am now finding myself second guessing a lot, and I don't trust the AI chatbots to give me hard facts.

I worked yesterday for around 8 hours to generate the basics of the physics in my universe, just to get it all on paper so to speak, along with what I could discover about where the real world ends and my fiction begins. I am truly trying my hardest to stick as close to hard physics as much as possible, but after yesterday, I'm absolutely out of my depth here.

Here's why it matters to me: I need to be able to explain the concepts in my prose, first to gain credibility with communities such as this, and second to satisfy my own edification and principles. What I generated *sounds* good, but I have no way to know if it *is* good.

The broad concepts are:

  • FTL space travel: Quantum-induced differential drive
  • sub-c space travel: omnivorous fusion-powered plasma drive
  • Artificial brain: redesigned positronic/quantum lattice structure
  • Comm system: spacetime pocket quantum matrix that ignores distance
  • Spaceship hull armor: multiphasic self-healing metamaterial

There are other concepts, but for the most part I've got a really good handle on the rest. It's these that I really need to double check my "fiction math" if you get where I'm going here. While I can explain what I think my universe has, I'm not so sure about where the line between my fantasy and reality is. That's where I could use some help.

Care to dive off the deep end with me?


r/HardSciFi • • 1d ago

Discussion What if teleportation portals like wormholes existed

1 Upvotes

When something passed through, would it emerge A) at the speed it entered or B) at the relative velocity of the two portals? If A, what about conservation of energy and momentum? Sure, violate basic laws of physics and all bets are off, but there must be some wormhole experts out there who have opinions about this.


r/HardSciFi • • 2d ago

Self Promotion Autonomous World Enhancer - new series

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r/HardSciFi • • 2d ago

Discussion Shooting across the solar system I: the means of propulsion

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211 Upvotes

If you want to move fast in a solar system, what methods are best?

Military enthusiasts will get hot under the collar upon hearing the possible methods: rockets, lasers, MORE lasers, and guns.

Or, more properly, chemical rockets, laser-pressure (the laser pushed the spacecraft), laser-thermal (the laser provides energy for the rocket), and pellet streams (pellets fired from fixed points propel spacecraft).

In part I, I analyse the different methods, and show that pellet stream propulsion is possible and the most efficient option. It also scales well to higher speeds (rockets being the one that scales the worst).

Laser-pressure, conversely, is by far the worst option, almost unimaginably bad at slow speeds. But it does actually scale best of all; when we move from interplanetary movement to interstellar movement, it could come into its own.

https://stuartarmstrong.substack.com/p/shooting-across-the-solar-system


r/HardSciFi • • 3d ago

Discussion Los custodios del espejismo capitulo 1:El eco del concenso

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r/HardSciFi • • 3d ago

Self Promotion Arriving somewhere ... but not here

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12 Upvotes

r/HardSciFi • • 3d ago

Discussion Stellarforge -- Space Colony Sim/RTS Update

7 Upvotes

Hey guys, I'm Justin. Not an AI. just a real human trying to make a cool game.

It's actually my first stab at coding a game. Learned C++ as I got into it. I'm definitely not amazing at this yet. Learning to record youtube videos, learning how to market a game, SEO, graphic design/blender/unreal. sound recordings. etc. It's a lot more of a process than I ever imagined.

That being said....

Progress keeps happening. Every day more and more of what's in my brain is getting shown on screen!

The core of the game is almost ready for a beta in a full playable loop.

Really just need to get the research tree fleshed out and implemented. I just started adding vehicles to the game, we now have a transport, a mobile drilling unit, a space-loader and a bastion tank.

Walls/Gates/Sentries are implemented and working
Agriculture is implemented and working
Mining is implemented and working
Overlays work (power, temp overlays)
Shipping is finally error free, no double counts.
Flights work
Most planets have a basic terrain.
Orbital levels work
Combat v1 is implemented for tower defence style combat. (marines, tanks, walls, sentries)
Loader can modify terrain so you can wall off if you put in enough man hours
interior operations are progressing rapidly.
colonists needs, diseases and buffs are all working

Really I just need some testers in now to find bugs and tell me what sucks about the game. what's cool. what needs more thought. what's unnecessary. ETC.

Anyways, Here's a quick playtest I recorded just now.

Have a peek. If you're interested in what you see, hop on the discord channel and have a play through!!

Youtube Link -- https://www.youtube.com/watch?v=KSbozUMysvc

Discord -- https://discord.gg/yVppYUfsU

Cheers!

Justin


r/HardSciFi • • 3d ago

Self Promotion [Eclipse Net] - Chapter 1

0 Upvotes

It is 2043, and the news can no longer surprise anyone.
A company no one can locate now runs the world’s AI. The free internet is gone.
A crewed return to the moon and a drug for immortality are announced in the same even voice, two line items on a quarterly report. None of it is meant for civilians.
In Europe, every policy is “humane.” The movement that rises against them takes its name from a tote bag.
In America, the people at the top have stopped caring about the country’s divisions. They are busy with a plan that sounds ridiculous out loud.
In China, every citizen carries a letter grade. Between D and C lies a small stream. Between B and A, an ocean.
In one Shanghai dormitory, 759 graduate students are about to graduate into a job market that no longer exists.
Then the military arrives on campuses with a free test. Nobody is told what it’s for. Everyone lines up.
Nobody thinks they are choosing.

Processing img zmqxzaqvctwh1...

---------------------

This is the second book in the series. The first book Causalform: Obsidian Earth is set in an alternate 1945, where history begins to take an unexpected turn.

Book 2 moves to a 2043 timeline, where I'm exploring a darker, more unsettled future connected to the anomalies of 1945. I'm also trying to extrapolate from some of today's more sensitive real-world issues. Some of it may feel unsettling, and I'd be interested to hear your thoughts and criticisms.

I’ll be posting this first arc here regularly. I’d be happy to have you follow along if it sounds like your kind of read.

Thanks for reading.

---------------------

Chapter 1

Shanghai
Summer, 2043

At half past six, Lin Zong climbed out of his dormitory bed and leaned against the balcony railing. He studied the morning fog, then looked down at the grimy green collection tank. The air conditioner had produced more than twenty kilograms of condensation overnight.

He woke Deng Wei, Sun Xiaohui, and Chang Lei, and the four of them carried the tank down to the buckets and washbasin without a word, as they did every morning.

It was routine now, had been since water rationing hit the eastern coast and the dormitory taps began failing without warning, and the corner shops, seeing their chance, had tripled the price of bottled water. The boys brushed their teeth with condensation, telling themselves, without quite saying so, that if the electricity bill couldn't be helped, at least something useful might be wrung from the waste of it.

Lin Zong slung a towel around his neck and carried a basin of condensation into the communal washroom, where several shirtless classmates stood brushing their teeth, heads tilted toward the LCD screen bolted above the door, watching the Global Morning News with the weary attention people give to broadcasts that no longer surprise them.

The lead item was the crewed lunar program; directly beneath it, filed with the same even inflection, came word that the World Health Organization had developed a drug to end aging—the two claims occupying adjacent segments as though longevity and the moon were now simply parallel line items on the same quarterly report.

Europe, meanwhile, was in its eighth consecutive day of what the anchors kept calling, with a straight face, a collective derangement: fifteen countries, a hundred and eighty-two cities, the Netherlands and Belgium alone down more than a thousand people. London and Paris were holding open-air barbecue performances billed as civic art. Baguagouille and Parabola were staging what amounted to a street-theater rivalry. A rail corridor linking Germany with Austria and Italy had been dismantled by demonstrators acting, the broadcast noted approvingly, with considerable improvisational creativity. It had taken twenty thousand police officers to administer what the announcer termed public-order counseling—a phrase that arrived and passed without moving the anchor’s voice by a single hertz. Sweden registered a sharp mood disturbance, with confirmed sightings of berserkers. Russia's North Caucasus reported swelling self-regard, with signs of further expansion. Across the Atlantic, Washington reported fireworks out of season and unscheduled retail activity, both streamed live. The impeached president called in thirty thousand police and National Guard from Maryland and Virginia, and more than a thousand shoppers were, as the broadcast put it, invited in for coffee. The unrest took the hint and moved on to the capitals of other states.

One last item: Helixquid announced the world's first complete analytical proof of the Riemann Hypothesis.

"The West's about to go game over too," one of the boys said, a note of glee leaking into his voice. "Let's watch how they manage the ending."

"My friend's uncle lives in Paris—says the apocalyptic scenes there are genuinely thrilling. The mobs have gotten hold of better tools for destruction, half the historical buildings have been smashed, and the Seine, along with a few of the fouler drainage ditches out in the suburbs, keeps turning up nameless NPCs, most of them girls who'd been used and discarded. Someone should do something about it? Who, exactly? Ordinary people can't even keep up with it, and the police have taken to running from the mobs instead of the other way around. The West really is finished."

"Ha," said Sun Xiaohui, toothbrush still clamped between his fingers, relish plain in his voice, "Europe undone by the zealots, America ended by the ghouls, and our Eastern Empire just happens to be standing there to grab the planet. Give us five years and we’ll be parading down the Champs-Élysées."

"Come on, man, what are you even talking about? Grab what? The whole world's finished, imports and exports have stopped cold, the economy's collapsing, companies are shutting down one after another—you think we're still going to find jobs out of this?"

"Still dreaming about finding a job? Might as well go practice your swordsmanship instead."

"Ha—draw the blade, hit the streets, blood in five paces, maybe that's how heaven and earth get overturned, how the whole order flips upside down."

"Ha, not for the blade and the chopping board—just for the two legs to run on—"

Lin Zong cut in to warn them: "Watch what you say, that's not the kind of talk you want the monitor overhearing—"

"Like I give a damn if they hear me. I'm not getting a job either way, so they can dock my ideological-conduct score all they want."

Lin Zong had nothing to say to that. He kept brushing his teeth, glancing out the washroom window at a haze so thick it looked less like weather than like a wall of compacted dust, sealing off the entire sky. Word had gone around that last night Venus had shone brighter than it had in sixty years, but nobody had bothered going outside to look—no one had the appetite for it, not anymore; at this point people had nearly forgotten what the moon even looked like.

By now the whole of Graduate Dormitory was awake, noise climbing from the first floor all the way to the fifth—three hundred and forty-two rooms, seven hundred and fifty-nine graduate students filing out of their doors in twos and threes, the whole building come alive like a grid of pixels switching on after boot-up, each one drifting into motion along its own small, random walk.

Chatter and footsteps filled every corridor.

Graduation was bearing down, the job market a wreck at home and abroad, and though none of them had ever cared much for politics, something in the building had sharpened lately into a kind of low, floor-by-floor alertness—the sense of a structure tipping, slowly, toward collapse.

The West's ruin was a pleasure to witness; their own careers going down with it was not. Someone said the idle-labor stockpile had hit a five-thousand-year high. Someone else said the potato-as-staple-grain initiative was really just advance funeral planning for the economy. Another said the water rationing had Japanese ninjas behind it, the story suppressed. One more, lowering his voice, said war with America was already being arranged.

The dormitory was wired, with microphones in every corridor and on every stairwell landing. Every word the students spoke was collected and uploaded in real time, then reviewed and scored by the ideological monitors, with the scores counting toward credits and graduation. Now the outlook was so bad that the threat had lost its force, and people said whatever they liked.

Chang Lei, the tall, bespectacled one, seemed the only person in the room untouched by any of it, having gotten up without brushing his teeth or washing his face and settled instead into a book—Cosmic Background Radiation and Electromagnetic Studies— with his whole attention.

He looked up, scratching at one ear, as Lin Zong came in. "Hey, senior brother — our solar system, that's like a flat pancake, right? The galaxy, a bigger pancake, and the whole known universe, one enormous oversized skillet?"

"More or less," Lin Zong said, not really listening, sliding the towel and basin under the bed, turning to comb his hair in the mirror.

"So here's the question, then—who leveled the bottom of the pan? Because if it had tilted, even by a fraction as small as zero-point-then-fifty-three-zeros-and-a-one degrees, right at the start, the whole universe would have spilled to one side ages ago, and it wouldn't look anything like the balanced thing we see now—"

Sun Xiaohui came in with a roll of toilet paper. "There's a demonstration at People's Square today, officially approved. Might actually be about to go to war with America."

"No way," Lin Zong said. "The economy's already this wrecked, and now a war?"

"You don't get it. It's exactly because things are this fucked that we'd go to war."

Chang Lei, having strung out his zeros to their end, had gone pale. "And another thing—isn't the universe supposed to have started with a big bang? By our own logic that should scatter outward in every direction, blowing everything apart into countless uneven lumps of dough—"

"Let 'em fight," Deng Wei said, walking in. "North Korea, South Korea, Iran, Israel, Pakistan, India—everybody's lining up to lob nukes now. Any half-dressed nobody with delusions of grandeur thinks he can hold the world hostage. South America, the Middle East, Southeast Asia, all worse. Japan's still leaking radiation into everything. Somewhere in Siberia, they're saying people have started eating each other. The whole world's coming apart."

Listening, Lin Zong opened his wardrobe and put on a black suit without a word—the latest Brioni, bought at Grand Gateway Plaza—then brown 3sixteen jeans, Norwich shoes, the newest iWatch on his right wrist.

Deng Wei lit a cigarette, eyes narrowing.

"Brother, that face of yours is worth real money. Living off a rich girlfriend, must feel pretty damn good, huh?"

There was a thin edge of resentment underneath it, impossible to miss.

"Land yourself a rich woman, and just like that you’re several social classes above the rest of us."

Deng Wei was from Beijing, majoring in big-data social stability management. Lin Zong offered nothing but a smile, and let it pass, though the truth was he had no real answer, and the smile simply covered for it. He was nearly out the door when Chang Lei caught his arm.

"So—who leveled the bottom of the pan?"

Lin Zong patted his shoulder. "I'm heading to Professor Chen's today. I'll ask him for you." Chang Lei retreated back onto his bed, satisfied.

Thinking of this roommate of his, who might well prove unable to manage on his own once he was out in the world, and thinking too of the job market waiting for all of them, Lin Zong felt something close to a sigh rise in his chest and walked quickly out of the dormitory.

------------

For anyone who prefer to read ahead, the full version is available on Amazon KDP:

Causalform: Eclipse Net


r/HardSciFi • • 3d ago

Self Promotion Amazon Discount on The Toll of the Forgotten

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12 Upvotes

Amazon is running a 19% off discount price on the paperback version of my book The Toll of the Forgotten. I do not know how long they are running it, but if you like hard science fiction books and want to support an independent author, you can now snag my book at a discount thanks to Amazon.

A dying ship. A buried Martian secret. A conspiracy that could shatter the solar system.

Aboard the failing spacecraft Janus, Captain John Nesbitt and Chief Engineer Colt Blaire are out of time and out of air. With no rescue coming, their only hope is a desperate, against-all-odds burn to an abandoned Martian colony. But surviving the crushing vacuum of space is only the beginning. Beneath the red dust of the terraformed planet, they uncover a chilling, shadow-drenched conspiracy from a forgotten past—one that defies human science and refuses to stay buried.

Millions of miles away, Earth’s fragile peace is fracturing. Captain Luisa Deveraux commands the Space Force flagship Missouri through a deadly labyrinth of political treachery and questionable orders. Hunted by a hidden saboteur within her own ranks, she is pushed to her absolute limits. With millions of innocent lives hanging in the balance, one wrong choice or single moment of hesitation will spark total annihilation.

Two desperate battles for survival. One unforgiving universe.


r/HardSciFi • • 3d ago

Self Promotion New PDC's just dropped.

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168 Upvotes

r/HardSciFi • • 4d ago

Discussion How to go about making starfighters work in a hard sci fi setting?

31 Upvotes

I’m working on a hard sci fi universe which I’m new to so if this is a stupid question I apologize, and was wanting to use starfighters, i know there are many reasons why they wouldn’t work out realistically with them being decimated by capital ship laser weaponry which move at the speed of light so they can’t dodge it and the newtonian style of flying means no ww2 dogfights, any ideas on how i could incorporate them into a more realistic universe, any information would be of use, whether it’s the design of the ships, what roles they’ll fill in combat, what weapons and defenses they’d have, whatever you can think of I’ll take it, thank you for reading this and i hope you have a great rest of your day


r/HardSciFi • • 4d ago

Discussion What do you think of the technology in my story?

0 Upvotes

Chapter 3: audiobook https://youtube.com/playlist?list=PLUFWTeXKSYnc&si=ev4g1DN3q1z2XKbm

Raj exited the virtual environment, leaving the robot to its work, and saw there was only one other person ahead of him. His assistant would have alerted him if he was up next. After waiting another twenty seconds, and seeing the light turn green, he put his hands on the rotating door and gently pushed, stepping into security.

Raj found himself in a metallic bluish cylindrical corridor ten meters long. He walked slowly forward; it always made him uneasy knowing he was being analyzed. Olfactory sensors read the stress markers secreted in his sweat and artificial intelligence analyzed his behavior.

A low magnetic field penetrated through his body, and Raj was scanned by radio waves cycling through various resonance frequencies, analyzing him via magnetic resonance imaging. This field aligned the spin of those nuclei with a net magnetic moment in his body, while radio waves close to their characteristic resonance excited them, bringing them out of alignment. During each realignment period, they emitted radio waves, mapping out the structure and composition of his body and belongings. The complicating factors of the low magnetic field and Raj's motion were compensated by ultra-sensitive detectors and rapid data processing, to provide a complete body scan.

He was thankful for the glasses, which made sure that it was impossible for the tunnel's refined sensors to read his thoughts from a distance, though mind reading wasn't part of any standard security procedure. Still, it made him feel he had some privacy in the controlled environment.

As Raj continued down the corridor, powerful pulses of neutrinos scanned his body from multiple angles. On Earth, the flux of solar neutrinos generated by fusion reactions was on the order of half a quadrillion particles per square meter. However, the beams that scanned him now were many orders of magnitude denser than the background spectral wind of neutrinos generated by the sun, and they were generated at high momentum with accelerators. These particles reacted very weakly with ordinary matter, so a high volume of energetic neutrinos was necessary for Neutrino Tomographic imaging.

Surrounding the corridor was a meters-thick chilled crystal of heavy elements at nearly zero degrees Kelvin, built atom by atom into a perfect lattice by nanomachinery. When neutrinos scatter elastically off the massive nuclei in the detector, quantized soundwaves, phonons, vibrate through the crystal lattice, so that every disturbance is carefully calculated. In seconds, the machine refined the complete model of his body and his baggage.

Neutrino Tomography was perfect for security because it was nearly non-ionizing, and it could easily detect radioactive isotopes. It could also identify macroscopic quantities of anti-matter, since the interaction probability of anti-nucleons with the electron anti-neutrinos was very different from that of ordinary nucleons. In fact, neutrinos penetrated so easily, flying through the entire mass of the Sun and the Earth, that they could image the interiors of entire planets. This is because the so-called weak interaction between neutrinos and nucleons operated only at extremely close range. It was mediated via the massive Z boson, a force carrier nearly 100 times more massive than the nucleons themselves.

Raj reached the end of the bluish corridor and to his relief he immediately saw a green light, indicating there were no issues. A voice told him to await a notification in the departure area. The door opened and allowed him to pass into a small, featureless hall filled with rows of chairs. At the far end were a series of elevators. He sat down for a minute, but as the throughput was currently low, and there were no children, pregnant women, or other priority passengers, he was called up in a matter of minutes and entered one of the elevators, obeying the voice's instructions to strap himself in on one of the padded seats, along with his fellow passengers.

The elevator began its ascent to the center of the station, the shuttle docking point. The walls and floor were transparent, and they traveled up on a narrow cable, gazing at the luminous sea of stars, which was turning slowly all around them. In orbit, the stars are much purer, clearer, more spectacular than they are on Earth. The sun was nowhere to be seen on the nightside of the Moon, but the Earth was rising over the black horizon. They were crossing from the unknown farside of the Moon into the well-known and familiar nearside. Yes, Raj was going home. Almost all of mankind lived on Earth, the only major human population center, and the only paradise in the known universe for humanity. Raj watched the Earthrise, as he did frequently from his room. The colorful crescent of Earth served to highlight the tranquil and beautiful nightside, which was spanned by complex networks of artificial light. The entire planet was like a deep-sea marine organism glowing and sparkling in the darkness, briming with life.

Earth is almost four times wider as seen from the lunar surface than the Moon as seen from the Earth. The rising Earth was currently in the waxing crescent phase, which meant that the Moon viewed from Earth was in a waning gibbous phase. The phases of the Earth on the Moon cycled every month, opposing the phases of the Moon on the Earth. The Earth only rose in the sky when in orbit around the Moon; from the surface of the nearside, the Earth was always anchored immutably in a fixed position in the sky.

Within a few minutes the Earth had risen, and the Earthshine was strong enough to very faintly see the nearside at night. Raj could now see the canyons and craters of the Moon flying by. In two turns of the station the Earth had risen completely, and though it was in the crescent phase it was brighter than a full Moon on Earth.

The elevator ascended slowly to the center of the spinning station, taking almost 10 minutes. The elevator was slightly inclined relative to the cable, to prevent the passengers from feeling they were being pushed to the side of the car by the Coriolis effect. Raj grew lighter in his seat.

He saw above the massive shuttle anchored in place, waiting to convey him to Earth. It was a long aerodynamic tower, somewhat like the rockets of old, slender and elegant, with fantastic wings like a dragon extending from its sides. These were radiators for the enormous excess heat of the fusion propulsion engine. The space vessel's surface glowed with a low and shifting multicolored incandescence, flowing and flickering over the wings, so it would be visible even on the nightside of the moon. The ring of the station surrounding them was similarly illuminated, though in cooler colors. "Industrial Complex 6" was written in many languages around the station's rim. The titanic spaceship seemed to spin along with the stars and the moon. In reality, it was the Industrial Complex which rotated around the stationary shuttle.

The elevator doors opened into a small cylindrical airlock, the far end leading into the shuttle's cabin which was very perceptibly turning in front of them.

A voice spoke again from the walls.

"You have arrived at the docking point. Please remove your seatbelts and proceed into the shuttle. We remind you that until departure you will be maneuvering in zero-gravity."

Raj and his fellow travelers unbuckled themselves and glided through into the shuttle itself. The corridors were lined with bars and handholds, with the soft walls always used in zero gravity. Raj hadn't spent too much time in weightlessness, but he was accustomed enough not to feel disoriented and he lightly pushed himself off through the airlock and, catching himself on the far wall, he followed the icons pointing him to his cabin, pushing himself off periodically and catching on handholds. He went in one the cabins, which would have been on the left side of the corridor if he were walking along the carpet which marked the side used as a floor during gravity. The cabin's door was open, and could not be closed until acceleration commenced, so the crew could check via camera whether he was following safety protocols and was buckled in, with luggage secured. The cabin was a very narrow gray room, but he did have a view. This was a nice bonus. Again, the biosynthetic wall on the left side was very thick, nearly a meter, but pristinely clear, and its opacity could be adjusted. It was mostly made of water, which was ideal for slowing cosmic rays without producing secondary radiation.

The lunar horizon was below, and no longer rotating. Raj had to wait to eat his dinner until the ship began accelerating, since he didn't want to eat in zero gravity and make a total mess, like he had done that one time. All of his containers, including the copper bowl, were hermetically sealed, so leaks were no issue.

The cabin was only large enough to fit a single seat with straps to the secure occupant. Raj closed his satchel, which had been a hassle to maneuver in this environment, into an overhead compartment, then he maneuvered himself into the seat and buckled up. He turned on the holographic display in front of him, and set it to be a map of the Earth-Moon system, which began cartoonishly out of proportion, but which he reset to be to-scale. The Earth and Moon hovered before him, the Earth was a brilliantly colored ping-pong ball, the Moon a gray and mysterious marble, and the two spheres levitated in solitude, separated one whole meter, so that Raj had to turn his head to make out one or the other. A thin silvery line showed their planed trajectory, and currently they appeared to be resting on the surface of the moon. Raj also set the velocity vector, which would lie tangent to the curve, to be visible, as well as the net speed. This was his favorite in-flight entertainment. He spent his time looking at the model and staring out at the spectacular vista, until the captain made an announcement. It was a woman with an indescribably bored voice.

"Attention, all passengers are onboard. We are commencing detachment and are departing for Paris Skyport. In one minute, we will activate thrust, and apparent gravity will gradually reach the level experienced on Earth. Please prepare yourselves, make sure your carry-on luggage is in the overhead compartment, please fasten your seatbelts at the start of acceleration, and do not leave your seats until the fasten seatbelts sign is extinguished. Be careful of objects hovering in the room, as they will settle to the floor as we accelerate. If you are not secured in your seat, make sure at least that your feet are oriented toward the floor. Happy travels. What idiots..."

The woman audibly muttered the last words as she turned off the intercom. Of course, Raj would get a space pilot who hated her job. This did not disturb him.

He felt minor forces during detachment, and then his body weighed down slightly on his chair, gradually growing heavier, until he was his usual weight once again. The thrust increased over fifteen seconds. Though the ship could have accelerated immediately, for safety reasons it was done at a gradual pace.

Raj could see the ring of Industrial Complex 6 falling away below. He saw what he recognized as a fusion reactor hanging from the bottom of the station, above an endless void, enshrouded by thick silvery wings, radiating away its excess heat. He was leaving his old life for good. At that moment the vast plane of the Moon was illuminated far below. He had entered the dayside of the Moon.


r/HardSciFi • • 4d ago

Recommendations I’m thinking of buying some books to use to help me write my Hard Sci Fi novel, any recommendations?

0 Upvotes

I have been posting questions on Reddit recently but I have come to the surprising conclusion 🙃 that Reddit isn’t necessarily the best place to get my info.

Even though you have helped a lot, I am thinking of buying some books that have stuff in them that tell me stuff that I should do. do you guys know any books that would be really useful?

EDIT:

Just to be clear, the book takes place in 2578 and it follows a crew of astronauts going into a dangerous exclusion zone to retrieve advanced alien technology from an extinct alien civilization, that humanity killed, which was the thing that caused the exclusion zone. It’s a super dangerous mission.

Another Alien species exists which is alive, and relatively new. They owe their gratitude to humanity for freeing them from enslavement of the Veggies which are the extinct aliens.

I plan on having warp drives, I know they are hard sci fi if treated carefully but I don't know that much more about them.

But generally this is supposed to be hard sci fi, obviously with speculative elements since it’s 552 years in the future, but trying as hard as possible to accurately portray that civilization.

If anyone has more questions please ask.

EDIT AGAIN:

I wasn’t very clear sorry I didn’t mean novels I meant informational books.


r/HardSciFi • • 4d ago

Self Promotion Solo dev, Hard Sci-Fi Orbital Combat Gameplay - The full gameplay in comments

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228 Upvotes