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Questions tagged [megastructures]

For questions about extremely large artificial structures, including buildings.

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2answers
114 views

Building a Dyson Array as an energy source

For the purposes of this question, assume that a Dyson Array is a collection of discrete solar panels or mirrors orbiting the sun, all of whom share the same orbit and have same velocity. Can a ...
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1answer
82 views

Creating a Matryoshka Shell World: Sectioning

In my previous two questions regarding temperature regulation and Rotations I set up the idea of creating a multi-layered shell world consisting of planetary crusts stuffed inside one another creating ...
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1answer
75 views

Reality check: multi-shell worlds and rotation

In the game Septerra Core, it is set on a shell world of 7 different world shells including a core. As per my Matryoshka world that I am building (this world but with full surface coverage on each ...
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4answers
212 views

Creating a Matryoshka Shell world: temperature regulation

In a galaxy far far away, during a fit of inspiration for a super massive marvel of technology, the Imperator dedicates an astounding 10% of energy and materials from his civilization's dyson sphere ...
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1answer
145 views

The Underdown, part 1: Size issues [closed]

So, If I'm trying to make a borderline-isekai (trapped in an MMORPG world anime) setting, I might as well just make the game mechanics more real, like invisible walls, everywhere. The world of ...
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1answer
282 views

How, and for how long, could a permanent storm be maintained on Earth by a stationary mega-structure?

Suppose you had a tower-like mega-structure, rooted all the way into near-infinite geo-thermal energy of the Earth's crust, connected to the ocean such that water is not a limiting factor to the super-...
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2answers
63 views

How can a medium-sized island be moved covertly? [closed]

Everybody who is familiar with the Mandela Effect will probably have a good time thinking up an answer for this. The Story An abusive secret organization/dictatorship wants to literally move an ...
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1answer
203 views

A self-eclipsing orbital ring

A common, matter-efficient science-fiction habitat is a hollow cylinder or ring in space that is spun to simulate the pull of gravity on its interior surface. These habitats have been imagined as ...
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6answers
5k views

What does a solid, 1 mile diameter subterranean glass sphere look like?

There is a solid glass sphere that is 1 mile in diameter. It is completely covered in dirt and rock, except for one small room that is built adjacent to the sphere. One of the four walls of this ...
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1answer
128 views

Building a planet with a primordial black hole core

I have been trying to figure out a way of explaining how an advanced society some time in the past built an artificial planet with a black hole at its core and the effects that would have on the ...
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4answers
456 views

Prevailing winds on a rotating space habitat

A common, matter-efficient science-fiction habitat is a hollow cylinder or ring in space that is spun to simulate the pull of gravity on its interior surface. These habitats have been imagined as ...
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5answers
399 views

How would gravity affect a structure that completely encircled the earth

If a circular structure could be built that would wrap around the entire earth, but was of a larger radius, would it 'float' above the earths surface or would it somehow fall onto the surface at some ...
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2answers
105 views

Has realistic climate modelling been done for inverted Dyson spheres or similar?

While there are approaches to make a habitable Dyson sphere that are technically reasonable, I am curious about what the climate would be like. For simplicity, consider a scenario where a thick shell ...
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3answers
162 views

Would there be gravity on the plates of a Dyson swarm?

I've heard several schools of thought. From a hard science standpoint, could there be gravity on the habitable surface of a Dyson Swarm plate? I keep thinking no. But if the outer shell were to be ...
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2answers
81 views

How to accelerate the rotation of an Earth-sized planet? [duplicate]

Colonists want to settle on Proxima Centauri a. The planet is slightly bigger than Earth, lies in the habitable zone, does have water and life (in my novel). But the problem is that only a 500-...
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2answers
164 views

Viability of options for super tall tower

I've been reading through other posts about such megastructures and they're getting me part of the way to my destination. Wanted to see about a few specific options my imagination has latched onto. ...
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2answers
204 views

Artificial water planet and shell world combo

I’ve been trying to create a water planet with certain aspects. I wanted it to have a breathable atmosphere and to be a microgravity environment. I’m developing humanoid characters that can breathe ...
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3answers
225 views

Environmental/meteorological effects of a superstructure

If there was a supermassive structure built on earth (30km tall, 10km wide/deep tower with slightly slanted faces), what sort of effects would this cause on the surrounding areas? Specifically, what ...
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2answers
158 views

Reasonable Legislative Restrictions on a Super Weapon [closed]

Scenario: A small nation has recently discovered an old, powerful Airship. The world knows this Airship only in legend and the possibilities that it can offer to any nation are endless. Although ...
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9answers
4k views

Are there any benefits to a large body of water in a space habitat?

The classic example of a cylindrical space habitat, Clarke's Rama, has a 10 km-wide ring of water at the middle. Most depictions of this O'Neill-style of habitat do something similar, placing a large ...
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3answers
135 views

Energy transfer to a planet far from its star [closed]

In future, before the destruction of the solar system, Humans have found a planet with mineral and element composition exactly like earth and they want to transfer all they need from earth to it, but ...
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2answers
375 views

How much ice do I need at 0.79c to protect my megastructure

Ok I have a moon, or cored out moon, that is a generation ship. I really do: I built it by mining out one of the rock/ice moons around my solar systems gas giants (not earth's solar system). Its ...
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1answer
1k views

How long would it take a civilization to see and understand a Dyson ring?

If a star had a Dyson ring of some kind around it, such that to the naked eye the star wouldn't dim at all, how long would it take a civilization to reasonably see and understand the Dyson swarm, ...
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12answers
3k views

Can you protect a Space Elevator from Space Junk?

The idea of an elevator reaching to the near cosmos is very tantalizing when trying to think of ways off planet. A major draw back to this idea is that a long, thin tower into the atmosphere seem like ...
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4answers
192 views

Reasons for every floor of an office building needing a unique code to access that floor via the lift [closed]

In my story the protagonist has found them self on the bottom floor of a New York Office sky scraper and has to escape. For whatever reason they cannot exit via any means other than through the roof ...
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2answers
142 views

Preferred method of mass transit inside an arcology?

This is more of a general question than a query about any specific model of arcology, but to make the question easier, let’s assume the arcology is either domed or covered by some sort pyramid made ...
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10answers
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Hiding a subterranean alien megastructure

I need to know if it’d be possible for a underground ring-like structure of immense proportions and alien design to go unnoticed by modern day sonar, radar, and geological surveying. For an idea of ...
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7answers
463 views

Floating island made of concrete, part 1: can it be made of roman concrete?

I'm working on this concept. A floating island a mile long and 200 meters wide that would travel eternally in a wide circle between Western Europe and the Americas. I am going to make some diferente ...
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6answers
2k views

How do 21st century C.E. submersibles enter an underwater dome swiftly and safely?

Imagine there is a micro-city built on the ocean floor in the pacific ocean covered with a durable dome with a 1 mile radius to keep water out. At this moment let us assume that the dome holds up ...
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7answers
739 views

O'Neill/McKendree Looping River

Is there a way to design a river system in an O'Neill/McKendree-style cylindrical habitat to passively feed into itself in an endless loop, from one end of the habitat to the other and back again? ...
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2answers
78 views

Reasons someone might build a giant ring around a planet? [closed]

And to immediately clarify that title, no I do not mean an orbital ring. That has an obvious use. The artifact I'm imagining is more like a giant fiber-optic cable (though it need not necessarily ...
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5answers
880 views

Would a planet-sized computer like a Jupiter Brain or a Matrioksha brain be more expensive to build than the Death Star?

If a Galaxy-wide Civilization like Star Wars were to build a Jupiter brain or Matrioksha brain, would it probably cost more to build then the Death Star? In Star Wars the Darth Star was over a ...
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3answers
266 views

White Dwarf mining?

This is a follow-up to Neutron Star mining. Assuming that problem can be solved, it would eventually degenerate to something similar to this case. And if it can't, white dwarfs seem like the next best ...
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3answers
601 views

Neutron star mining?

Suppose you want to mine material from, and eventually completely disassemble, a neutron star. Presumably, you would be extracting heavy elements from the crust, and expecting the neutron-degenerate ...
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4answers
318 views

Extremely huge dirigible/airplane hybrid feasibility

Hybrid dirigible airplane with an extremely large surface area on the top and bottom. Talking at least 100 km2. It would likely be several modular pieces put together, given its size. It would need ...
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2answers
358 views

Stellar Compression in Dyson Sphere

A Dyson sphere is a spherical megastructure built around a star with the goal of capturing all of the energy output of the encased star and making that energy available to the controllers of the ...
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1answer
119 views

How to blow up an alien skyscraper? [closed]

In the story a group of people needs to bring down a huge alien skyscraper (I have intended it to be around two (2) miles high but I can modify this based on the answers). Note that the alien ...
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1answer
207 views

Creating a viable/stable Alderson disk

I'm currently working on a number of artificial space megastructures. Recently, I've been trying to work out a couple of things to do with alderson disks: What a person on the surface would see (ie, ...
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3answers
393 views

How Many People Per Dam Arcology?

Arcologies are never defined by shape. One of the options to consider is constructing "dam arcologies". Envision the Hoover Dam with most of its non-support structure given over to living and ...
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3answers
263 views

With minimal terraforming, what features/structures would need to be built to protect a 25mi radius city from wind?

I understand that the wind is caused by a differential in atmospheric pressure, but say that a city built in an extremely flat landscape is constantly threatened/harassed by the wind and wind-related ...
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1answer
347 views

How much mass does a human need to live a satisfying life?

Humans evolved in ancestral environments as semimigratory omnivores, which has embedded several things into our instinctive sense of wellness, aka "all is alright with the world", among them a ...
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3answers
291 views

Ringworlds and habitability on other planets

This is the second part of a question here that I've broken up because they are two very distinct problems. Assuming a perfectly stable ringworld: Assume a more traditional flat ringworld that is not ...
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2answers
501 views

Stable ringworld interactivity with other solar system objects

I thought of two questions regarding ringworld structures in solar systems with results I can't assume, so I will try to describe each (assume stability): If a (toroidal) ringworld were massive ...
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0answers
153 views

How to crash the earth into the sun? [closed]

I have grown a strong hatred against humanity..... so I want to kill all of them MWHAHAHAHAHAHA hahahaha cough. I have near unlimited resources in terms of money. So I want to know how to make the ...
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2answers
199 views

With modern science and engineering, what is the tallest and thickest structurally sound wall we can make

My question is as the title put it. I would like to know how large and thick of a wall we could currently construct. Given we have no limitations in money or materials. Bonus if it's actually sturdy ...
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3answers
238 views

How can you set up a mine for the lower layers of the gas giants?

So in the story I'm writing, mankind has advanced farther in the next few decades than we have over the past couple thousand years. Colonization has allowed us to settle the planets, and the FTL drive ...
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9answers
4k views

What to do with all the heat in a Dyson Sphere?

In the wake of this, my answer to this question about where to put a Dyson Sphere an apparent issue came up. And it needs some good resolution: What are we going to do with all that heat the system ...
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5answers
342 views

How long does a component of a Dyson swarm spend in shadow?

I'm building a Dyson sphere - a real one, like Freeman Dyson originally proposed, made of swarms of solar collectors in independent orbits that fully surround the star, something like this: Each ...
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2answers
181 views

How long would it take to be able to make artificial moons? [closed]

Say I want a world where there are many moons orbiting the Earth. They will be man made (so no convenient asteroids). So there is a scientist and he designs moons. How far forward from modern day ...
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1answer
83 views

Using Europa's geysers as a source of geothermal power?

Assuming you already had sufficient money and resources to build a tower stretching from the top of Europa's ice layer down to the bottom of the seabed, could you build it on top of one of its geysers ...