These later proposals have not been limited to solar-power stations, with many involving habitation or industrial elements. Die optimale Form der Ringwelt liegt also zwischen diesen beiden Formen, wobei die Richtung der Druckkraft an jedem Ort parallel zur Fläche der Ringwelt liegt, so dass kein Biegemoment auftritt. Some of the proposed stellar engine designs are based on the Dyson sphere. [38][39] Further analysis based on data through the end of 2017 showed wavelength-dependent dimming consistent with dust but not an opaque object such as an alien megastructure, which would block all wavelengths of light equally. Meer informatie, Meld bugs en laat feedback voor dit spel achter op de discussiefora, Don't want to miss the latest news of Dyson Sphere Program? Since then, other variant designs involving building an artificial structure or series of structures to encompass a star have been proposed in exploratory engineering or described in science fiction under the name "Dyson sphere". [31][full citation needed][32] Identifying one of the many infrared sources as a Dyson sphere would require improved techniques for discriminating between a Dyson sphere and natural sources. If assuming a radius of 1 AU, then the compressive strength of the material forming the sphere would have to be immense to prevent implosion due to the star's gravity. In theory, if enough satellites were created and deployed around their star, they would compose a non-rigid version of the Dyson shell mentioned below. Different types of Dyson spheres and their energy-harvesting ability would correspond to levels of technological advancement on the Kardashev scale. Different types of Dyson spheres and their energy-harvesting ability would correspond to levels of technological advancement on the Kardashev scale. The Dyson net reduces to a special case of Dyson shell or bubble, however, depending on how the cables are supported against the sun's gravity. Hence, Dyson selected the title "Search for Artificial Stellar Sources of Infrared Radiation" for his published paper. By the time a civilization is ready to use this technology, the carbon nanotube's manufacturing might be optimised enough for them to have a density lower than the necessary 0.7 g/m2, and the average sail density with rigging might be kept to 0.3 g/m2 (a "spin stabilized" light sail requires minimal additional mass in rigging). It consists of a large number of independent constructs (usually solar power satellites and space habitats) orbiting in a dense formation around the star. A Dyson sphere is a proposed megastructure that encompasses the Sun (a star) to harness its energy. Mehr über Memory Alpha, das Star-Trek-Wiki. [20] This is approximately 33 trillion times the power consumption of humanity in 1998, which was 12 terawatts.[22]. Constructing such a system would make such a civilization a Type II Kardashev civilization. [2] The wavelength(s) of radiation emitted by the collectors would be determined by the emission spectra of the substances making them up, and the temperature of the collectors. Disadvantages resulting from the nature of orbital mechanics would make the arrangement of the orbits of the swarm extremely complex. However, as of 2015 graphene has not been fabricated in large sheets, and it has a relatively high rate of radiation absorption, about 2.3% (i.e., still about 97.7% will be transmitted). [15], A single sheet of graphene, the two-dimensional form of carbon, has a density of only 0.37 mg per square meter,[16] making such a single sheet of graphene possibly effective as a solar sail. Die Enterprise-D in der Umlaufbahn um eine Dyson-Sphäre. [2] The wavelength(s) of radiation emitted by the collectors would be determined by the emission spectra of the substances making them up, and the temperature of the collectors. [11] Another potential problem is that the increasing loss of orbital stability when adding more elements increases the probability of orbital perturbations. [34][full citation needed] Other searches also resulted in several candidates, which are, however, unconfirmed. System generated star map, each run will be a unique universe. Collectors would absorb and reradiate energy from the star. It has been proposed that a biosphere could be contained between two concentric spheres, placed on the interior of a rotating sphere (in which case, the force of artificial "gravity" is perpendicular to the axis of rotation, causing all matter placed on the interior of the sphere to pool around the equator, effectively rendering the sphere a Niven ring for purposes of habitation, but still fully effective as a radiant-energy collector) or placed on the outside of the sphere where it would be held in place by the star's gravity. In response to letters prompted by some papers, Dyson replied, "A solid shell or ring surrounding a star is mechanically impossible. [2], SETI has adopted these assumptions in their search, looking for such "infrared heavy" spectra from solar analogs. Theoretically, any gas giant could be enclosed in a solid shell; at a certain radius the surface gravity would be terrestrial, and energy could be provided by tapping the thermal energy of the planet. He proposed that searching for such structures could lead to the detection of advanced, intelligent extraterrestrial life. A second type of Dyson sphere is the "Dyson bubble". He proposed a system of orbiting structures (which he referred to initially as a shell) designed to intercept and collect all energy produced by the Sun. The contents of any biosphere placed on the inner surface of a Dyson shell would not be attracted to the sphere's surface and would simply fall into the star. This would intercept the full 384.6 yottawatts (3.846 × 1026 watts)[21] of the Sun's output. Star Trek: Deep Space Nine – Das technische Handbuch, https://memory-alpha.fandom.com/de/wiki/Dyson-Sphäre?oldid=641832. Collecting resources, plan and designing production lines, gradually create a full automated factory. The phenomenon raised speculation that a Dyson sphere may have been discovered. Such constructs would not be in danger of collision or of eclipsing one another; they would be totally stationary with regard to the star, and independent of one another. [28] This concept is explored peripherally in the novel Accelerando (and the short story Curator, which is incorporated into the novel as a chapter) by Charles Stross, in which Saturn is converted into a human-habitable world. The shell would be vulnerable to impacts from interstellar bodies, such as comets, meteoroids, and material in interstellar space that is currently being deflected by the Sun's bow shock. Das Konzept wurde in den späten 1990er Jahren von dem Informatiker Robert Bradbury entworfen. "[2] Dyson speculated that such structures would be the logical consequence of the escalating energy needs of a technological civilization and would be a necessity for its long-term survival. For a Dyson shell of 1 AU radius around a star with the same mass as the Sun, a mass travelling ten times the orbital velocity (297.9 km/s) would support 99 (a = v2/r) times its own mass in additional shell structure. [13], For the same reason, such a shell would have no net gravitational interaction with anything else inside it. As of 2005[update] Fermilab has an ongoing survey for such spectra by analyzing data from the Infrared Astronomical Satellite (IRAS). ", "Alien Supercivilizations Absent from 100,000 Nearby Galaxies", "Infra digging: Looking for aliens: The search for extraterrestrials goes intergalactic", "Astronomers may have found giant alien 'megastructures' orbiting star near the Milky Way", "Mystery of 'Alien Megastructure' Star Has Been Cracked", Toroidal Dyson swarms simulations using Java applets, FermiLab: IRAS-based whole sky upper limit on Dyson spheres, Orbital Technologies Commercial Space Station, https://en.wikipedia.org/w/index.php?title=Dyson_sphere&oldid=983686341, CS1 maint: BOT: original-url status unknown, Articles containing potentially dated statements from 2005, All articles containing potentially dated statements, Articles with incomplete citations from January 2016, All Wikipedia articles written in American English, Creative Commons Attribution-ShareAlike License, This page was last edited on 15 October 2020, at 17:20. Such a structure would, however, have a mass quite a lot less than many asteroids. [3], The concept of the Dyson sphere was the result of a thought experiment by physicist and mathematician Freeman Dyson, when he theorized that all technological civilizations constantly increased their demand for energy. The interior of the sphere would absorb the entire energy output of that star, allowing for lifeforms to live on the interior surface almost indefinitely. Log in om de redenen te zien waarom je dit wel of niet leuk kunt vinden, gebaseerd op je spellen, vrienden en curators die je volgt. A bubbleworld is an artificial construct that consists of a shell of living space around a sphere of hydrogen gas. Ein Schiff der Galaxy-Klasse bräuchte sieben Stunden, um die komplette Innenoberfläche abzusuchen. This construction approach has advantages: components could be sized appropriately, and it can be constructed incrementally. [20] This is approximately 33 trillion times the power consumption of humanity in 1998, which was 12 terawatts.[22]. In fictional accounts, Dyson spheres are most often depicted as a Dyson shell with the gravitational and engineering difficulties of this variant noted above largely ignored. A spherical shell Dyson sphere in the Solar System with a radius of one astronomical unit, so that the interior surface would receive the same amount of sunlight as Earth does per unit solid angle, would have a surface area of approximately 2.8×1017 km2 (1.1×1017 sq mi), or about 550 million times the surface area of Earth. This would decrease communication distances that would be important for computer-based societies as those described above. [33] Fermilab discovered 17 potential "ambiguous" candidates, of which four have been named "amusing but still questionable". A bubbleworld is an artificial construct that consists of a shell of living space around a sphere of hydrogen gas. Dyson's proposal did not detail how such a system would be constructed, but focused only on issues of energy collection, on the basis that such a structure could be distinguished by its unusual emission spectrum in comparison to a star. "[2] Dyson speculated that such structures would be the logical consequence of the escalating energy needs of a technological civilization and would be a necessity for its long-term survival. Die Beobachtung des 1450 Lichtjahre entfernten Sterns KIC 8462852 ergab unregelmäßige Helligkeitseinbrüche in den Jahren 2009, 2011 und 2013. ", "SPACE.com Exclusive: Breakthrough In Solar Sail Technology", "The Space Review: The high risk frontier", "Space travel with solar power and a dyson sphere", "Dyson FAQ: How strong does a rigid Dyson shell need to be? [6] Some have suggested that such habitats could be built around white dwarfs[7] and even pulsars. Non-shell designs would intercept less, but the shell variant represents the maximum possible energy captured for the Solar System at this point of the Sun's evolution. [13] To illustrate the low mass of the required materials, consider that the total mass of a bubble of such material 1 AU in radius would be about 2.17×1020 kg, which is about the same mass as the asteroid Pallas.

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