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Q&A

Posts tagged megastructures

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Q&A How efficient can a Dyson sphere be?

The shell variant of a Dyson sphere consists of an artificially-made shell of material about 1 AU in radius encircling a star. The sphere captures most of the star's energy and stores it for future...

1 answer  ·  posted 2y ago by HDE 226868‭  ·  last activity 2y ago by celtschk‭

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Q&A Water & Nutrient Cycle of an upside down forest

This is a follow up question to Sky of Earth and Seas of Sky I have a medieval fantasy setting where people live in a vast expanse of giant caves contained in a sort of giant Stanford torus. This...

7 answers  ·  posted 2y ago by Nosajimiki - Reinstate Monica‭  ·  last activity 2y ago by Nosajimiki - Reinstate Monica‭

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Q&A Could a galaxy of Nicoll-Dyson beams hit a single target?

This was an idea for a flashback as I pick up my story around 100 trillions years from now at the point where star formation is ceasing and the red dwarf and stellar remnant era begins. Now living ...

2 answers  ·  posted 2y ago by RandySavage‭  ·  last activity 2y ago by RandySavage‭

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Q&A What is the best form of powered vehicular flight within a McKendree habitat?

Background A McKendree cylinder is a spinning space habitat in the style of an O'Neill cylinder (below), but orders of magnitude larger. McKendree habitats are hundreds of kilometres in diameter a...

3 answers  ·  posted 3y ago by rek‭  ·  last activity 2y ago by rek‭

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Q&A Where to place an artificial oceanic island?

I want to build a seastead in international waters that starts small. It has to be in the Atlantic, preferably in the northern hemisphere close to either the american or european continent. Due t...

1 answer  ·  posted 3y ago by SilverCookies‭  ·  last activity 3y ago by SilverCookies‭

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Q&A What percentage of stars would need to become Shkadov thrusters to move the whole galaxy?

The advanced civilization in my story is trying to reach as many galaxies as possible in the next few billions years before the expansion of space has sent those galaxies permanently out of reach w...

1 answer  ·  posted 3y ago by RandySavage‭  ·  last activity 3y ago by RandySavage‭

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Q&A Meteorological consequences of walls reaching into the sky, enclosing a large area

Suppose we walled off a 1000 km square. These walls would be made of unobtanium (so they don't break), and have no cracks or holes that go all the way through. They are also around 15 kilometres hi...

1 answer  ·  posted 3y ago by Mark Gardner‭  ·  last activity 3y ago by Mark Gardner‭

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Q&A Roughly how long could an 'Oumuamua type object get?

Roughly how long could an 'Oumuamua type object get if created naturally or if created artificially using fused rock? What would be the limiting factor governing the length of such objects? Oumaum...

2 answers  ·  posted 3y ago by Slarty‭  ·  last activity 3y ago by Slarty‭

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Q&A Are Orbital Rings feasible to construct in another star system?

In this universe, Earth had a couple orbital rings during the construction of the colony ships that were sent to Alpha Centauri. Humanity has achieved fusion power and efficient space flight (1g ac...

2 answers  ·  posted 3y ago by user72655‭  ·  last activity 3y ago by user72655‭

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Q&A How to allow a cylindrical habitat (O'Neill or McKendree) to radiate heat to space?

Background I am trying to find a design for a cylindrical habitat that would allow the enclosed cylinder to radiate heat out to space as does the Earth without using mirrors and windows. Problem ...

6 answers  ·  posted 3y ago by Abanob Ebrahim‭  ·  last activity 3y ago by Abanob Ebrahim‭

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Q&A How massive can a structure get on the inside of a Mckendree cylinder?

Background A McKendree cylinder is a rotating cylindrical space habitat comparable to the more well known O'Neill model. It was proposed by NASA engineer Thomas McKendree in 2000 as an update of O...

1 answer  ·  posted 3y ago by Abanob Ebrahim‭  ·  last activity 3y ago by Abanob Ebrahim‭

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Q&A Maximum Size Limit for a Wooden-and-Bamboo Neo-Ziggurat

There is a concern that's been brought up only recently--steel and concrete buildings are environmentally wasteful. In further clarification, they waste away too much greenhouse gases. And consid...

3 answers  ·  posted 3y ago by JohnWDailey‭  ·  last activity 3y ago by JohnWDailey‭

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Q&A Could an enormous structure be used to attract rain by acting as an artificial mountain?

If it were possible to build a giant geodesic dome tens of miles in diameter, what effect would it have on nearby weather? If built in an arid climate like the Sahara or Australia, would it be li...

3 answers  ·  posted 3y ago by Stonecraft‭  ·  last activity 3y ago by Stonecraft‭

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Q&A How could a skyhook stay in orbit with no human involvement for thousands of years

In the story I'm writing, three humans with stone-age technology and no knowledge of space accidentally awaken thousands of cryogenically preserved humans. These humans immediately get to work on...

4 answers  ·  posted 3y ago by John Lewis‭  ·  last activity 3y ago by John Lewis‭

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Q&A How to mine a star?

Things like Dyson spheres need a whole lot of raw material, which is rather difficult to come by, since the elements needed for good structural steel are scattered fairly thinly into the universe u...

3 answers  ·  posted 3y ago by Haem‭  ·  last activity 3y ago by Haem‭

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Q&A Hurricane-force winds or gentle breezes in an O'Neill Cylinder?

Let's consider an O'Neill cylinder with a radius of 3.2km and length of 20km. In the classic O'Neill design, we have three large axis-aligned windows in the shell, alternating between purlins of ha...

3 answers  ·  posted 3y ago by David‭  ·  last activity 3y ago by David‭

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Q&A Is it possible to have multiple different climates within one O'Neill cylinder?

The illustrations of O'Neill cylinders I have come across with so far allow unrestricted view through the whole tube. Some are more playful with topography but still, there is a visible end. Are t...

3 answers  ·  posted 3y ago by Backup Plan‭  ·  last activity 3y ago by Backup Plan‭

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Q&A How large would a space station have to be to hold one million people indefinitely?

A moon-sized asteroid approaches Earth in the near future, where space tourism has become normal. The Earth has a few satellite structures above Mars conducting research, as well as successful terr...

2 answers  ·  posted 3y ago by Alex‭  ·  last activity 3y ago by Alex‭

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Q&A Life on the Broken Ring - an issue of size

One of my ongoing projects is what I think of as the "constructed worlds gallery", a series of Megastructures as settings for stories and games, including things like the "Flying Pie-plate" a world...

4 answers  ·  posted 3y ago by Ash‭  ·  last activity 3y ago by Ash‭

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Q&A 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 pe...

1 answer  ·  posted 4y ago by Althaen‭  ·  last activity 4y ago by Althaen‭

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Q&A What would the climate of a planetwide city be like?

Assume the entirety of Earth (all the land) is covered in a city. What would the climate be like in different parts of it? I.e., what would it be like on the coast, or inland? I imagine it would b...

5 answers  ·  posted 4y ago by V. Red‭  ·  last activity 4y ago by V. Red‭

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Q&A 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 s...

4 answers  ·  posted 4y ago by Mike Nichols‭  ·  last activity 4y ago by Mike Nichols‭

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Q&A 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 so...

6 answers  ·  posted 4y ago by crZyhamSter‭  ·  last activity 4y ago by crZyhamSter‭

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Q&A 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 syste...

10 answers  ·  posted 6y ago by dot_Sp0T‭  ·  last activity 4y ago by dot_Sp0T‭

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Q&A Hot rods into space!

Based on this question about an impossible barbell planet, how hot would the bar be if it extended from halfway in the Earth's mantle to an altitude of 2r of Earth's radius? The diameter of the bar...

1 answer  ·  posted 7y ago by Green‭  ·  last activity 4y ago by Green‭

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Q&A 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 creat...

1 answer  ·  posted 4y ago by GuidingOlive‭  ·  last activity 4y ago by GuidingOlive‭

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Q&A 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 spher...

4 answers  ·  posted 4y ago by GuidingOlive‭  ·  last activity 4y ago by GuidingOlive‭

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Q&A 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 su...

1 answer  ·  posted 4y ago by Irving Washington‭  ·  last activity 4y ago by Irving Washington‭

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Q&A 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 s...

1 answer  ·  posted 4y ago by Mike Nichols‭  ·  last activity 4y ago by Mike Nichols‭

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Q&A 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 ...

6 answers  ·  posted 4y ago by Pink Sweetener‭  ·  last activity 4y ago by Pink Sweetener‭

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Q&A 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? ...

7 answers  ·  posted 5y ago by rek‭  ·  last activity 4y ago by rek‭

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Q&A 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 b...

3 answers  ·  posted 5y ago by Richard‭  ·  last activity 4y ago by Richard‭

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Q&A 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 she...

2 answers  ·  posted 4y ago by nordmarj‭  ·  last activity 4y ago by nordmarj‭

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Q&A 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...

2 answers  ·  posted 5y ago by Len‭  ·  last activity 5y ago by Len‭

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Q&A 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, wha...

3 answers  ·  posted 5y ago by Peaches‭  ·  last activity 5y ago by Peaches‭

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Q&A 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...

2 answers  ·  posted 5y ago by ArtisticPhoenix‭  ·  last activity 5y ago by ArtisticPhoenix‭

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Q&A 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 lar...

9 answers  ·  posted 5y ago by rek‭  ·  last activity 5y ago by rek‭

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Q&A 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 tri...

5 answers  ·  posted 5y ago by user73829‭  ·  last activity 5y ago by user73829‭

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Q&A Can Cloud Nine be built?

Cloud Nine is the name given by Buckminster Fuller to his proposed tensegrity sphere airborne habitats. The principle is simple and the physics seem to be sound. For a sphere, as its radius is ...

10 answers  ·  posted 7y ago by Samuel‭  ·  last activity 5y ago by Samuel‭

Question megastructures
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Q&A 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, a...

1 answer  ·  posted 5y ago by SpaceMouse‭  ·  last activity 5y ago by SpaceMouse‭

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Q&A 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 l...

12 answers  ·  posted 5y ago by Renzler‭  ·  last activity 5y ago by Renzler‭

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Q&A 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 ...

10 answers  ·  posted 5y ago by Z.Schroeder‭  ·  last activity 5y ago by Z.Schroeder‭

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Q&A 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 b...

6 answers  ·  posted 5y ago by user6760‭  ·  last activity 5y ago by user6760‭

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Q&A 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-degenerat...

3 answers  ·  posted 5y ago by Logan R. Kearsley‭  ·  last activity 5y ago by Logan R. Kearsley‭

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Q&A 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 b...

3 answers  ·  posted 5y ago by Logan R. Kearsley‭  ·  last activity 5y ago by Logan R. Kearsley‭

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Q&A 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 n...

4 answers  ·  posted 5y ago by Brooks Nelson‭  ·  last activity 5y ago by Brooks Nelson‭

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Q&A 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 me...

2 answers  ·  posted 5y ago by TheNewGuy‭  ·  last activity 5y ago by TheNewGuy‭

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Q&A 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 (...

1 answer  ·  posted 5y ago by Amon‭  ·  last activity 5y ago by Amon‭

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Q&A 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-relat...

3 answers  ·  posted 5y ago by Reed‭  ·  last activity 5y ago by Reed‭

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Q&A 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 e...

2 answers  ·  posted 6y ago by Ross‭  ·  last activity 6y ago by Ross‭

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