History Main / DysonSphere

4th Aug '16 12:03:28 AM nightshade01
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** The ''Literature/StarTrekDestiny'' trilogy features the Caeliar. They build a sphere around their sun to hid it from the rest of the galaxy and another smaller one around their planet which draws energy from the sun's sphere allowing them to make the Omega Particles which power their civilization. [[spoiler:An offshoot faction of them which were sent back in time, by an accident which nearly destroyed their civilization, billions of years to one of the first galaxies to ever form]] build spheres around every single star in the galaxy thereby harnessing not just the full power of a single star, but the full power of an entire galaxy. [[spoiler:They do this in order to create a ''StableTimeLoop'' and CAUSE the 'accident' which sent them back in time to begin with]]. The Enterprise E briefly visits this 'shrouded galaxy' by traveling through a subspace corridor and realize any race capable of doing such a thing is one best left alone, and very quickly gets out of there.

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** The ''Literature/StarTrekDestiny'' trilogy features the Caeliar. They build a sphere around their sun to hid hide it from the rest of the galaxy and another smaller one around their planet which draws energy from the sun's sphere allowing them to make the Omega Particles which power their civilization. [[spoiler:An offshoot faction of them which were sent back in time, by an accident which nearly destroyed their civilization, billions of years to one of the first galaxies to ever form]] build spheres around every single star in the galaxy thereby harnessing not just the full power of a single star, but the full power of an entire galaxy. [[spoiler:They do this in order to create a ''StableTimeLoop'' and CAUSE the 'accident' which sent them back in time to begin with]]. The Enterprise E briefly visits this 'shrouded galaxy' by traveling through a subspace corridor and realize any race capable of doing such a thing is one best left alone, and very quickly gets out of there.
31st Jul '16 10:29:03 AM UmbrellasWereAwesome
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** ''Literature/HaloBrokenCircle'' features an incomplete Shield World similar to (if nowhere near as complex as) Requiem, named "The Refuge" by its current inhabitants the Ussan Sangheili. [[spoiler:It also has an experimental emergency feature where it can break apart and hide its various components in a nearby asteroid belt.]]

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** ''Literature/HaloBrokenCircle'' features an incomplete Shield World similar to (if nowhere near as complex as) Requiem, named "The Refuge" by its current inhabitants inhabitants, the Ussan Sangheili. [[spoiler:It also has an experimental emergency feature where it can break apart and hide its various components in a nearby asteroid belt.]]
31st Jul '16 10:28:05 AM UmbrellasWereAwesome
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* ''VideoGame/HaloWars''[='s=] final arc takes place in a micro Shield World, complete with a miniature artificial sun.

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* ** ''VideoGame/HaloWars''[='s=] final arc takes place in a micro Shield World, complete with a miniature artificial sun.
31st Jul '16 10:27:45 AM UmbrellasWereAwesome
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* ''VideoGame/HaloWars'' has a micro Dyson Sphere in the finale. The ExpandedUniverse has one the size of a solar system; time passes much slower inside the sphere than it does outside.
** Here an actual reason for ''why'' an advanced civilization would build one is given. The Shield Worlds were bunkers where the Forerunners would take shelter when the Halo Array was triggered; considering they were trying to shelter the entire population of an interstellar empire and possibly less-advanced sentient species, it is understandable they would need a lot of room.
*** Probably not ''that'' much, though. A Dyson sphere the size of Earth's orbit would have over fifteen ''trillion'' times the surface area of Earth. That's more room than would be necessary for a civilization spanning the entire galaxy, with multiple inhabited planets per system.
** ''VideoGame/{{Halo 4}}'' is mostly set within one such "Shield World" called Requiem. It's similar to the Halo Wars example, but instead of an "inside-out" planet, this sphere is a shell which contains another planet inside. The shell does appear to have a geology of its own, though.

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* ''VideoGame/HaloWars'' has a micro Dyson Sphere in the finale. The ExpandedUniverse has one the size Forerunners of ''Franchise/{{Halo}}'' built quite a solar system; time passes much slower inside the sphere than it does outside.
** Here an actual reason for ''why'' an advanced civilization would build one is given. The Shield Worlds
few of these. Known as "Shield Worlds'', they were intended to be bunkers where the Forerunners would take shelter when the Halo Array was triggered; considering they triggered:
* ''VideoGame/HaloWars''[='s=] final arc takes place in a micro Shield World, complete with a miniature artificial sun.
** ''Literature/HaloGhostsOfOnyx'' has one that's BiggerOnTheInside. Specifically, though the sphere itself is twice the size of Earth's orbit, it is contained within a slipspace bubble that is only 23 centimeters in normal space; due to this, time passes much slower inside the sphere than it does outside. Considering that the Forerunners
were trying to shelter the entire population of an interstellar empire and possibly ruling over a countless number of less-advanced sentient species, it is it's understandable that they felt like they would need a lot of room.
*** Probably not ''that'' much, though. A
room (a Dyson sphere the that size of Earth's orbit would have over fifteen ''trillion'' times the surface area of Earth. That's more room than would be necessary for a civilization spanning the entire galaxy, with multiple inhabited planets per system.
Earth).
** ''VideoGame/{{Halo 4}}'' is mostly set within one such "Shield World" called Requiem. Requiem, the oldest known Shield World. It's similar to the Halo Wars ''Halo Wars'' example, but instead of housing a star surrounded by an "inside-out" planet, this sphere is a Requiem's outer shell houses additionally layered shells, the outermost of which contains another planet inside. The shell does appear to have a geology of has an Earth-like environment on its own, though.surface.
** ''Literature/HaloBrokenCircle'' features an incomplete Shield World similar to (if nowhere near as complex as) Requiem, named "The Refuge" by its current inhabitants the Ussan Sangheili. [[spoiler:It also has an experimental emergency feature where it can break apart and hide its various components in a nearby asteroid belt.]]
15th Jul '16 8:46:37 AM Specialist290
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See the [[Analysis/DysonSphere Analysis]] page for more information about how such an object might work in the real world.






!! Some useful notes on the RealLife physics of objects this size:
* In response to letters prompted by his original paper, Freeman Dyson replied: "A solid shell or ring surrounding a star is mechanically impossible. The form of 'biosphere' which I envisaged consists of a loose collection or swarm of objects travelling on independent orbits around the star." The evolution of the term "Dyson Sphere" is an example of MemeticMutation. Dyson himself referred to his idea as a "shell" or "swarm", and his use of [[http://en.wikipedia.org/wiki/Biosphere "biosphere"]] was in the ''ecological'', rather than any ''geometric'' sense. But then the "sphere" misconception and RuleOfCool caught up with him.
* The surface gravity of the outside of a stereotypical 1-AU solid shell is likely to be negligible. Gravitational acceleration due to the Sun out there is less than 1/1000 g. Calculus and physics (the [[http://en.wikipedia.org/wiki/Shell_theorem Shell Theorem]]) tell us that the gravitational effect of any spherical shell we're outside of is equivalent to that of the same mass as a point source at the shell's center; we can assume that the sphere doesn't have mass orders of magnitude more than the Sun, considering that it has to be made of locally available materials and the Sun weighs much more than everything else nearby combined, so don't expect much. Also, increasing the mass of the star increases its brightness, so the sphere would be larger as well. However, it might be possible for a SufficientlyAdvancedAlien to build a smaller, 'hot' Sphere, in which case the gravity would be higher.
* The surface gravity on the inside of a 1-AU solid shell is also negligible. [[http://en.wikipedia.org/wiki/Shell_theorem Newton's shell theorem]] predicts that the gravity anywhere inside a hollow sphere would actually be zero, so that the main gravitational force acting on a body at the inside surface would be the star at the center, which as stated above is not large. Spinning such an object would allow for near-normal gravity at the surface, but as was discovered by Creator/LarryNiven, the strength-to-weight ratio of the material required to withstand 1g of centrifugal force across this scale would be something around 1000 times that of steel. Of course, SpeculativeFiction writers are allowed to {{handwave}} it as 'a network of gravity generators', FunctionalMagic, etc.
* A [[http://en.wikipedia.org/wiki/Klemperer_rosette Klemperer Rosette]] is a group of objects set to orbit together in a rotating pattern. Technically this may count if it's big enough to be considered a small solar system, and the objects were placed there artificially.
* A solid Dyson Sphere would not be stable around its star without some form of correctional thruster system or AppliedPhlebotinum to keep everything bolted in place. [[MohsScaleOfScienceFictionHardness Harder]] settings may couple the star to the mass streams of active supports holding up the sphere.
* A point which is often ignored is that a solid shell will not only have eternal day, but also, instead of reflecting sunlight into space, will reflect it upon the sphere itself. This means that a shell around a Sun sized star will have to be not 300 million km across, but more likely about twice as much in order to maintain reasonable temperatures or using materials either with high efficiency in the production of energy (if the interior wall is dedicated exclusively to energy production) or with a high thermal conductivity coupled with an interior wall with high absorption of radiation. A reasonable partial solution to this is for a star-faring society (and any society able to build a Dyson Shell is likely to be star-faring at least potentially) to select a smaller, cooler star (say a class M) and build their Shell around it, letting it heat up to hotter intensities due to reflection.
* Assuming that a solid shell Dyson sphere could be made to spin and produce Earth equivalent gravity, that 1G value of gravity would only exist at the equator (and arguably the tropic latitude regions of the sphere. As one moves the the hemispherical regions, the gravity reduces until there is zero gravity at or near the axis regions. This is one of the reasons that the Niven ring is more practical. Much of the inner region of a fully enclosed Dyson sphere would be superfluous and uninhabitable.
* A Dyson sphere could be used as a computational node for a single massively powerful supercomputer, presumably either a segment of, or the entire physical being of, some kind of massively advanced ArtificialIntelligence entity, presumably of the post-[[TheSingularity Singularity]] kind. Such an entity would be called a "[[http://en.wikipedia.org/wiki/Matrioshka_brain Matrioshka brain]]" named after Russian Matrioshka dolls, because it may consist of layers of Dyson shells within each other, the inner layer being devoted to energy harvesting while the outer structures are devoted to computation.
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13th Jun '16 12:17:42 AM jormis29
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* ''VideoGame/{{Prey}}'' takes place, for the most part, in an organic/cybernetic [[LivingShip living]] Dyson ''spaceship'', the "Sphere". It's essentially a smaller version of this trope, with a small dwarf star at its core.

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* ''VideoGame/{{Prey}}'' ''VideoGame/Prey2006'' takes place, for the most part, in an organic/cybernetic [[LivingShip living]] Dyson ''spaceship'', the "Sphere". It's essentially a smaller version of this trope, with a small dwarf star at its core.
29th May '16 3:54:32 AM Doug86
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* ''ComicBook/NewMutants'', an ''Comicbook/{{X-Men}}'' spin-off from Marvel Comics, featured a Dyson Sphere belonging to Cannonball's then-girlfriend, Lila Cheney. It had actually been built and abandoned by unknown aliens, but Lila (whose power is intergalactic teleportation) found it and claimed it as her base of operations. Since she can ''only'' teleport over intergalactic distances, any short-range travel requires a double teleport, with the Dyson Sphere being a convenient transit point. Thought the Dyson sphere is featured in the opening and publicity artworks as a nice, yellow-greenish background

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* ''ComicBook/NewMutants'', an ''Comicbook/{{X-Men}}'' ''Comicbook/XMen'' spin-off from Marvel Comics, featured a Dyson Sphere belonging to Cannonball's then-girlfriend, Lila Cheney. It had actually been built and abandoned by unknown aliens, but Lila (whose power is intergalactic teleportation) found it and claimed it as her base of operations. Since she can ''only'' teleport over intergalactic distances, any short-range travel requires a double teleport, with the Dyson Sphere being a convenient transit point. Thought the Dyson sphere is featured in the opening and publicity artworks as a nice, yellow-greenish background
14th Apr '16 7:44:07 PM eroock
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->''"Imagine the energy crisis of a '''really''' advanced planetary civilization. They've used up all their fuels, they depend on solar power. An enormous amount of energy is generated by the local star, but most of the star's light doesn't fall on their planet. So perhaps, they would build a shell, to surround their star, and harvest every photon of sunlight. Such beings, such civilizations, would bear little resemblance to anything we know.''
-->-- The Dyson Sphere, in a nutshell, as described by Creator/CarlSagan.

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->''"Imagine the energy crisis of a '''really''' advanced planetary civilization. They've used up all their fuels, they depend on solar power. An enormous amount of energy is generated by the local star, but most of the star's light doesn't fall on their planet. So perhaps, they would build a shell, to surround their star, and harvest every photon of sunlight. Such beings, such civilizations, would bear little resemblance to anything we know.''
"''
-->-- The '''Creator/CarlSagan''', describing the Dyson Sphere, Sphere in a nutshell, as described by Creator/CarlSagan.
nutshell
11th Apr '16 10:33:54 AM HeraldAlberich
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[[quoteright:350:http://static.tvtropes.org/pmwiki/pub/images/Dyson_sphere_diagram.jpg]]
[[caption-width-right:350:It's huge.]]

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%% Image selected per Image Pickin' thread: http://tvtropes.org/pmwiki/posts.php?discussion=1459713245082845800
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[[quoteright:350:http://static.tvtropes.org/pmwiki/pub/images/Dyson_sphere_diagram.org/pmwiki/pub/images/dyson_sphere_artist_2.jpg]]
[[caption-width-right:350:It's huge.]]
[[note]][[http://adamburn.deviantart.com/art/SHield-World-Construction-118068881 Image]] by [[http://adamburn.deviantart.com/ AdamBurn]][[/note]]]]
22nd Mar '16 6:47:55 PM FordPrefect
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** On the other hand, there IS at least [[http://www.projectrho.com/public_html/rocket/weirdastronomy.php#id--Object_X one object]], that ''could'' be a Dyson Sphere, judging by its visual properties.

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** On the other hand, there IS at least [[http://www.projectrho.com/public_html/rocket/weirdastronomy.php#id--Object_X one object]], object]] that ''could'' be a Dyson Sphere, judging by its visual properties.
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