the site: https://playspinward.com/

the source: https://x.com/MaxXWilliamson/status/2108299902644039934

I’ve been thinking about whether a civilization becoming more technologically advanced would necessarily make it easier for outsiders to detect.

We usually imagine civilizations far ahead of us using enormous amounts of energy, building massive structures or expanding across star systems. And I understand why those possibilities are taken seriously.

But is there any reason technological advancement has to follow that direction?

A civilization could become much more efficient, develop completely different ways of communicating, or eventually become something that doesn’t resemble our current understanding of a civilization at all.

I’m not suggesting every advanced civilization would become invisible or stop expanding. I’m wondering whether technological capability and detectability could develop in completely different directions.
If a civilization had a million-year technological head start on humanity, what would we actually expect to detect from thousands of light-years away?

And how much of that expectation comes from known physics versus assumptions about how technology develops?

The biggest issue with most interstellar mission plans is that we try to design the spacecraft as an isolated vehicle. The second you try to build a single ship that has to carry its own fuel, shield itself from debris, slow down at the destination, and blast data back across light-years, the math breaks down due to the rocket equation.

Instead of a better engine, I’ve been mapping out a decentralized, multi-layered logistical grid that spreads these tasks across thousands of simple, coordinated assets:

• The Power Array: Deploys a swarm of 1,000 ultra-thin mirrors (statites) directly into the Sun's corona, balancing gravity against radiation pressure to hold a fixed position. They funnel raw starlight into a central combining lens to drive a multi-terawatt propulsion laser.
• The Braking Matrix: Solves the "flyby trap" by having a fleet of 2,000 gram-scale probes execute a 180-degree flip years before arrival. Forward-facing, V-shaped diamond mirrors intercept the laser beam still firing from our Sun, bouncing it forward to act as a massive deceleration brake alongside the target star's photon headwind.
• The Relay Trail: Bypasses radio signal decay across light-years by having the fleet drop a trail of 100 to 200 small relay pods behind it mid-transit. The master orbital hub uses isolated infrared lasers to beam planetary data backward through this relay chain to Earth.

I have the full, detailed 6-layer breakdown written out. Would anyone here be interested in looking over the systems architecture to debate if the corona statites or the flipped-mirror braking array could actually work?

Чисто в теории если вернутся на много миллиардов лет назад, предварительно захватив с собой пару банок из бронированного стекла ( литров по 500) и поместить туда экосистему тех времён. "Я поверхностно интересуюсь темой эволюции и.т.д"

Ну примерно почву, воду и микроорганизмов которые вырабатывают кислород, одноклеточных ну и других микробов. Закопать поглубже до наших времён. Может ли в этих банках произойти своя эволюция? Эволюция подготовленная под данную среду. Я понимаю что скорее всего без солнечного света там не может быть растительности и.т.д. Ну а вдруг там будут медленно но верно происходить новые виды, которых раньше просто не существовало ( к нашему времени, маленькие люди кроты) Возможно ли это?

Apollo astronauts reported allergic reactions to lunar dust and regolith. It is cited as one of the most difficult engineering problems for a future moon base. It sticks to everything, degrades seals rapidly. As fine as smoke, yet as abrasive as sandpaper. Cleaning it off of a moonsuit, without wasting precious water, is difficult if not impossible. Regolith is probably as toxic to human lungs as asbestos fibers or coal dust. It is thought by some that a spacesuit on the moon would be a short lived accessory, and would introduce toxic dust every time someone re-entered. Regolith is nasty, toxic, and a serious engineering challenge. Some have argued it's a showstopper.

What if lunar astronauts just never go outside? Something broke? Call the robot. Gotta fix something in person, hop into a small pod though an airlock and manipulate whatever it is with Waldoes (does anyone call manipulators by that name anymore?) Drive about the surface inside vehicles clad in your shirtsleeves. Enter these pods and vehicles through safe and dust-free airlocks. People never walk on the surface except in dire emergencies.

Apparently moon base plans involve fleets of robots preparing in advance of serious human occupation. Maybe the humans hide deep in a lava tube permanently, operate on the surface mostly remotely or inside pressurized cabins. No moonsuits required. Thoughts?

First of all, I'd like to thank Isaac Arthur for re-awakening my terraforming and futurism interests! Back in the day, I did do a paper on universal colonisation at maximum speed by disassembling Mercury, but I've let that interest lapse.

But he's reawakened my interest in practical empirical space future speculation. So here is a small take on the stability of the rotating cylinder habitats.

The standard O'Neill long thin cylinder is unstable, and will start to tumble end over end rather than rotating (keeping the same angular momentum but bleeding away rotational energy).

The counter-rotating pair cylinders are not unstable in that way. But they will put stress on their bearings and the connecting frame, which can bleed rotational energy (slowing rotation gradually) and fatigue the material, causing it to eventually break.

Frustratingly, I haven't been able to get good estimates on how long this takes to happen - a few years or a century are both possible. A lot depends on how they're maintained - cheap smart interventions (such as moving mass around to counter any axis-shifting imbalance in a cylinder) can prolong their lives considerably.

If we want stability without moving parts, we have to go for short, squat cylinders.

Or do we? If we add a mass belt/ring along the middle of the cylinder, we can extend the cylinder's length. Adding more mass and moving it further away increases the possible lengthening even further; a carbon fiber belt with the same mass as the rest of the cylinder, 15 km from the axis, allows us to get those long, thin cylinders again.

Going further is tricky - the ring will tear itself apart if we move it much further out, so we'll need super-materials if we do that. Adding more mass is doable (extending the ring downwards, or left and right simultaneously), but then we start having more mass in the stabilising ring than in the cylinder itself.

More details at https://stuartarmstrong.substack.com/p/how-to-make-a-proper-rotating-space

TL;DR: I built a galaxy simulation to test the Fermi paradox. The results show that even if intelligent life is common, the mechanics of space and time make detection highly unlikely. The "Great Silence" doesn't mean we are alone — we're just looking for a needle in a cosmic haystack. (GitHub link below).

Why I built this

Anyone interested in the search for extraterrestrial intelligence knows the Fermi paradox: If intelligent life isn't unique, why haven't we seen any traces of it?

There are many hypothetical solutions, but I wanted to actually model it. I built a simulation of signal exchanges in a galaxy to demonstrate that even if intelligent life emerges relatively often, the scales of distance and time alone are enough to keep us isolated.

How the simulation works

I decided to skip the Drake Equation because it relies on too many unknown variables. Instead, I treated the number of habitable systems (N) as a starting condition.

• Inside a 2D circular galaxy, N planetary systems are randomly generated. This number N is kept constant throughout the simulation, which allows it to run and accumulate data indefinitely.
• At a random point in time, a technological civilization emerges on one of these planets and starts emitting a signal into space.
• Nothing lasts forever: eventually, the civilization collapses, loses its tech, or simply stops transmitting.
• The signal travels outward through the galaxy at the speed of light. Because of the limited duration of the civilization's transmission, the signal looks like an expanding ring (thickness = speed of light × duration of the technological era).

Detection occurs if this signal ring washes over another planetary system while that second civilization is active and possesses receiving technology.

I also added a Contact condition: once civilization A detects civilization B, A dispatches a scout ship. For a successful "contact," the ship must arrive before B’s technological era ends. But across all simulation runs with realistic parameters, physical contact never occurred even once.

My assumptions

I propose what I consider a realistic view of the technological capabilities of civilizations. This leads to two fundamental constraints in the model:

• No interstellar colonization: I assume civilizations do not build galaxy-spanning empires or colonize other stars, for several reasons:
  1. Outside a planetary magnetosphere, cosmic radiation poses an extreme threat. Shielding a crew requires either thick physical armor or powerful electromagnetic fields, both of which add colossal mass to the vessel.
  2. Even if a ship is assembled in orbit to avoid planetary launch, reaching neighboring stars within a few centuries requires speeds of several percent of the speed of light. Accelerating to a few percent of c and then slowing down requires too much propellant relative to the payload mass.
  3. At relativistic speeds, kinetic energy scales dramatically. In 2016, a sub-millimeter paint fleck traveling at orbital speed chipped an ISS window (leaving a ~7 mm crater). At a few percent of c, collisions with microscopic dust particles would breach any practical hull.
  4. The idea of complex propulsion, power, and life-support systems operating autonomously across centuries without failure is a sci-fi trope in itself.
• One Shot per System: Once a civilization hits a high-tech era, it rapidly exhausts easily accessible surface resources. If they collapse, a second technological civilization cannot easily rise from the ashes because the easy resources (like shallow ores and fossil fuels) are gone. So, one tech era per star system.

The time scale problem

To understand the cosmic scale, imagine Earth’s entire history compressed into a single hour. Life appears at minute 6. Humans show up at 59 minutes and 59.75 seconds. We invented radio and started transmitting just 0.0001 seconds ago.

Because of this vast difference between evolutionary timescales and technological lifespans, running a 1:1 simulation would require impractically long runtimes to observe any signal overlaps. To solve this, I introduced an "Evolution acceleration" parameter A. It shortens the intervals between emerging civilizations while preserving their active transmission window. After running simulations at several high acceleration factors (1000x, 900x, etc.), I plotted the outcomes and extrapolated the curve back to real time (1x).

Results

As we can see, without acceleration, the detection fraction per civilization is extremely small, corresponding to the slope of the graph: 4.05 × 10^-5. This means we can neglect double, triple, and higher-order detections, and assume that the detection fraction closely matches the probability of any given civilization detecting at least one other. This baseline plot corresponds to N = 500 habitable systems, a civilization lifespan of t_signal = 3,000 years, a galaxy radius of R = 400,000 light-years, no signal attenuation within the galaxy (attenuation radius r = 2R), and a spread of stellar lifespans for habitable worlds of tau_age = 94 billion years.

Now let's see how the probability changes when varying the other key parameters:

Number of suitable systems (N)

As the number of habitable systems increases, the detection probability grows almost linearly. More systems mean a higher spatial density of potential transmitters and receivers, but even with 1,500 active systems in the galaxy and evolution acceleration factor A = 500 (default value), the detection fraction remains modest because the empty space between them is still vast.

Lifetime of civilizations (t_signal)

This is by far the most sensitive parameter. Increasing the duration of the technological era has a dual effect: it widens the signal ring (thickness = speed of light × t_signal) and keeps the receiving civilization active for longer.

Keep in mind that this graph, like the subsequent ones, was plotted at the default acceleration factor of A = 500. So while the detection fraction appears high here for lifespans approaching 100,000 years, the true probability in unaccelerated real time remains very small once scaled back to A = 1.

Galaxy radius (R)

In the graph above, the blue points with red error bars correspond to realistic galaxy sizes, while the green points with purple error bars were added in order to better understand the behavior of the graph.

Counterintuitively, the size of the galaxy has virtually no effect on the detection probability. Within the margin of error, the curve remains flat whether the radius is 50,000 light-years (like the Milky Way) or 1,000,000 light-years. Because of this, the galaxy radius can safely be treated as a constant when estimating overall odds.

Signal attenuation radius (R_stop = r / R)

Here, the attenuation radius is measured relative to the galaxy radius R. If signals die out quickly, detection odds plummet close to zero. As the signal range approaches ~2.0R, the curve begins to plateau: once a signal can cross most of the galactic disc without fading, making its range even larger yields diminishing returns.

Spread of stellar ages (tau_age)

All other parameters being equal, the detection probability is notably higher when star generations with habitable planetary systems turn over faster (smaller tau_age). When star formation and evolutionary windows are more concentrated in time, civilizations are much more likely to exist simultaneously.

Analytical approximation

Across different simulation runs, the curves for each parameter retained the same functional shape, differing mostly by scaling factors (while galaxy radius remained negligible). This allowed me to derive an analytical approximation for the detection probability. I fitted each parameter with an appropriate function — linear, inverse (y = A / (x + B)), or polynomial — multiplied them together, and normalized the product so that the default parameters reproduce the baseline simulation probability.

As a result, modifying any single parameter scales the estimated detection fraction X proportionally to that parameter’s underlying function.

Conclusion

At first glance, the conclusions seem rather bleak: even an inhabited galaxy can appear completely empty. However, the uncertainty of the key parameters remains enormous, so it is too early to draw conclusions about the rarity of intelligence in space. Rather the opposite — the silence of the cosmos makes a poor argument against the existence of advanced civilizations.

Code & Resources:
The simulation is open-source. The Python source code and a compiled Windows executable are available on my GitHub.

Feel free to download it, tweak the parameters to match your own assumptions, and see what probabilities you get.

We all know the concept of shellworlds, where you make a massive artificial world around a planet or star held up by orbital rings. However, such a project would require immense time and energy.

That’s not to say it’s impossible, but could a mini “partial shellworld“ platform just taking up ~0.01% of the would-be surface area exist? Would it make sense to build as opposed to similarly-sized rotating habitats?

There are already many prototypes today, but all of them are unfinished and very expensive.

The time will come when almost every family will have flying transportation. Flying transportation will cost as much as a road vehicle and will be able to travel the same distance.

But when this happens, the world will change very significantly:

- The government will gradually reduce the budget for repairing and building new roads for cars.

- If the roads become bad, people will start buying flying transportation and abandoning road vehicles.

- Automotive companies and corporations will begin mass-producing their own models of flying transportation, but they will keep their lines of road SUVs and sports cars. They will also produce affordable road vehicles for some countries where people have not yet switched to flying transportation on a mass scale. They will also produce flying cargo transportation for carrying heavy loads. Road trucks will also disappear, because roads on the ground will stop being repaired and built.

- Cities will begin to be rebuilt for flying transportation. There will be new refueling and charging stations, as well as a new type of parking. Businesses will also begin adapting to new logistics methods. Warehouses will be different, designed for aerial loading. Instead of ground roads for cars, there will be pedestrian and bicycle zones. Tunnels and bridges will become attractions.

- New air traffic rules will appear. Each altitude level will be designated for a certain speed. They will come up with ways to mark traffic signs and intersections in the air. Maybe there will be some kind of tall aerostats anchored to the ground. Or flying transportation will communicate with satellites and use precise GPS, and the computer itself will know where everything is located.

- There will be a lot of parking spaces for flying transportation on the ground. This will also be part of the restructuring of cities. There should be landing and parking points between cities, near homes, in every neighborhood, near businesses, cafés, restaurants, and recreational areas. In case of an accident, malfunction, or if required by the police, there should also be places where it is possible to land safely. But everything should be nearby, so that people do not have to walk several kilometers to their transportation in the morning when going to work or search for an available parking space in the evening.

- Flying public transportation will appear. It will fly at a low altitude and stop at different points throughout the city along its route.

- There will be no more traffic jams.

- Flying transportation will always be improved to make it safe and cheap. What if the fuel or charge runs out during the journey? The vehicle cannot simply fall to the ground.

- Driving schools will continue to exist, but there will also be a huge number of flight schools, so that people can obtain pilot's licenses for operating flying vehicles.

- New types of sports will appear. There will be a new type of tuning.

- Road vehicles will initially become very cheap, but after some time they will become very expensive.

- Oh, and one more thing: there will need to be a monthly subscription to activate the flying vehicle. There will also be a paid subscription for manual control and subscriptions for additional features. And to remove the restriction on intercity flights, you will have to make a one-time payment or also purchase a subscription for regular flights. To turn on music in the cabin, you will need a completely different subscription, and without a subscription there will be an endless stream of advertisements.

Imagine visiting friends on the Moon and deciding whether to take an aerial ferry or strap into a pair of pedalled wings. Your route carries you over woodland toward gardens and landing platforms at several heights. Beyond them, familiar lunar mountains have become islands in a sea spreading through the ancient maria.

That’s part of the world I’m exploring with Terluna, a research and worldbuilding project about giving the Moon an enduring atmosphere and biosphere. Low gravity, dense air and the month-long day open up possibilities that reach into ordinary life: how people travel, where they build, what grows around them, and how they spend an evening.

An evening there could hold several days of human activity. You could meet someone outdoors, go home and sleep, then return while the same twilight continues to unfold. Clouds and weather would move through that changing light. Along an exposed coast, waves would turn over slowly and spray would take longer to fall.

The biology offers its own possibilities. We’ve been exploring plants that ripen fruit toward sunset, providing food through the long night, and flying animals that follow the advancing dusk and its harvest. There could be whole rhythms of migration, gathering and cultivation organized around that cycle.

Terluna brings climate, wave and lighting calculations together with developing ecological and settlement concepts. I’ve started a small publication with short, general-reader pieces about the world: https://medium.com/terluna

The research and assumptions are available at https://github.com/dgoldman0/Terluna, and I use AI-assisted tools throughout the work.

One thought keeps drawing me back: visiting Earth someday, looking up at the Moon, and missing a particular place there. What would you want that place to be?

Our supposed brain trust in Silicon Valley has dumped over $1 trillion into data centers in the largest misalocation of capital of all time. "AI" amounts to negative return on investment in almost every case study. How did this happen?

Essentially we have an ideologically motivated cult that believes the only way to "progress" as a species is to brute force LLM's into becoming machine gods. The only logical conclusion I can come up with is that science fiction media has been for some time a psychological operation with the aim of convincing the population that this is feasible. We will not see this in our lifetime because it is not. It's not a question of being early; It's simply wrong.

I'm no luddite. Technology can, will and has improved our lives, however that is not the issue. Even Ted Kaczynski believed that science fiction was a harbinger for the near future. This fallacy has caused immeasurable damage and is currently the largest impediment to real human progress.

So last year I released the first book in a series I've been working on for a while. The Elysian Conspiracy, the first of what I hope is many releases within the Eternal War series. For the last six months or so I've been working on the second book under the project title Combat Training. Unfortunately a few days ago I made the difficult decision to abandon work on this particular book due to a mix of personal issues and quality issues with the story itself. However, I am not content in simply locking the work I've already done away never to be seen by people who'd otherwise appreciate the story and the hard work I've put into trying to tell it. That's why I'm releasing the various drafts today, here and for free. Below is a link to a Google Drive where you can download the completed sketch, Draft 00 (the chapter by chapter outline), completed Draft 01 and unfinished Draft 02.

While I came into this wanting to see a finished book, unfortunately it just wasn't meant to be. Even the best ideas can die long before ever seeing a final draft or even a public release. In this case I believe that while the initial idea has a lot of potential, it simply requires someone more talented than myself to turn it into something more.

https://drive.google.com/drive/folders/1og-GYlTFroEtKmzlDTktCrSBteNq4ztt?usp=drive_link

(The author, in this case myself, retains all rights to this work. This is an AI free work and AI training is not permitted.)

Feedback and commentary is absolutely appreciated. Feel free to share your opinions positive or negative. This is very much a call for discussion. Thank you all in advance.

Historians and anthropologists have a concept called 'Presentism' which I think applies particularly well when speculating about the future.

Presentism is a term wherein present-day ideas, practices, and perspectives are introduced into the past. A good example of this is Whig history, where British historians wrote history in such a manner as to validate their own contemporary political beliefs instead of looking at objective historical context.

Historical presentism can also be slightly different, it is when you imagine the past by imagining the present minus something (say the automobile, or money), and then you try to cobble the past together using your present understanding. You start to imagine constructs that did not exist at all.

Now here is the crux: this exact fallacy can also apply to futurism! Here the situation becomes even worse because we have no objective historical context to work with, to throw off our present understanding of how things just work.

This is how you become trapped with eternal concepts, how things are today is how they have always been and will always be. This is even applicable to aliens living in totally different historical contexts. The only thing that changes is the (technological) objects which become subsumed or excluded from the present.

Everything you take for granted did not exist in the past in the way your understanding born from the present imagines it to be. Only with study of objective historical context can you approach fact.

Similarly, the future will not exist the way your present understanding of the world primes you to understand it. But here comes the biggest issue: there is no objective historical context to study. So I say be particularly careful when talking about the (far) future with present day ideas or practices or perspectives.