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Dyson_Sphere_-_00_jpg.jpegThe Dyson Sphere64 visiteA Dyson Sphere is a hypothetical megastructure that encompasses a star and captures a large percentage of its power output. The concept is a thought experiment that attempts to imagine how a spacefaring civilization would meet its energy requirements once those requirements exceed what can be generated from the home planet's resources alone. Because only a tiny fraction of a star's energy emissions reaches the surface of any orbiting planet, building structures encircling a star would enable a civilization to harvest far more energy.
The earliest modern imagining of such a structure was by Olaf Stapledon in his science fiction novel Star Maker (1937). The same concept was later used by physicist Freeman Dyson in his 1960 paper "Search for Artificial Stellar Sources of Infrared Radiation". 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. MareKromium
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Dyson_Sphere_-_01.jpgThe Dyson Sphere (here: Dyson Revolving Rings)71 visiteDyson 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. A signature of such spheres detected in astronomical searches would be an indicator of extraterrestrial intelligence.MareKromium
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Dyson_Sphere_-_02.jpgThe Dyson Sphere93 visiteSince Dyson's paper, many variant designs involving an artificial structure or series of structures to encompass a star have been proposed in exploratory engineering or described in science fiction, often under the name "Dyson sphere". Fictional depictions often describe a solid shell of matter enclosing a star – an arrangement Dyson himself considered impossible. The sphere he imagined consisted of a loose collection or swarm of objects traveling on independent orbits around the star, an arrangement that has become known as a Dyson Swarm.MareKromium
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Dyson_Sphere_-_03.jpgThe Dyson Sphere (here: Complex and interconnected Dyson Swarm)68 visiteDyson-style energy collectors around a distant star would absorb and re-radiate energy from the star. The wavelengths of such re-radiated energy may be atypical for the star's spectral type, due to the presence of heavy elements not naturally occurring within the star.
If the percentage of such atypical wavelengths were to be significant, an alien megastructure could be detected at interstellar distances. This could indicate the presence of what has been called a Type II Kardashev civilization.
SETI has looked for such infrared-heavy spectra from solar analogs, as has Fermilab. Fermilab discovered 17 potential "ambiguous" candidates, of which four were in 2006 called "amusing but still questionable". Later searches also resulted in several candidates, all of which remain unconfirmed.MareKromium
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Dyson_Sphere_-_06.jpegThe Dyson Sphere74 visiteOn October 14, 2015, Planet Hunters' citizen scientists discovered unusual light fluctuations of the star KIC 8462852 raising press speculation that a Dyson sphere may have been discovered. However, subsequent analysis showed that the results were consistent with the presence of dust.
In 2024 there was press speculation that potential signs of interstellar Dyson spheres had been discovered.
The seven objects of interest – all located within a thousand light-years of Earth – were M-dwarfs, a class of stars that are smaller and less luminous than the Sun. However, the authors of the findings were careful not to make any overblown claims. Despite this, many media outlets picked up on the story.
Less fantastical explanations included a suggestion that the detected infrared was caused by distant dust-obscured galaxies.MareKromium
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Dyson_Sphere_-_07.jpegThe Dyson Sphere85 visiteAlthough Dyson Spheres in the form of a swarm are theoretically possible, building a stable megastructure around the Sun is currently far beyond humanity's engineering capacity. The number of craft required to obtain, transmit, and maintain a complete Dyson sphere exceeds present-day industrial capabilities.
Dyson Spheres have prompted speculation into the feasibility of a class of proposed stellar engines, hypothetical megastructures whose purpose is to extract useful energy from a star, sometimes for specific purposes.
For example, Matrioshka brains have been proposed to use energy extracted by Dyson Spheres for computation, while Shkadov thrusters would extract energy for propulsion. Some proposed stellar engine designs are based on the Dyson Sphere. Futurist George Dvorsky has advocated the use of self-replicating robots to overcome the limitation of humanity's engineering capacity in the relatively near term.MareKromium
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Dyson_Swarm_-_01.jpgThe Dyson Swarm76 visiteSome have suggested that Dyson Sphere habitats could be built around white dwarfs or pulsars.
In 2022 it was suggested that a Dyson Swarm around the Sun could be launched from either Mercury or Mars.
In order to transmit the energy back (Microwaves and high frequency IR Radiations maybe?), far-field radiative wireless power transfer was proposed, a technology that is not yet fully developed. But the question remains open...
A Dyson swarm is a hypothetical megastructure that orbits a star to capture its radiant energy. Proposed as an alternative to the solid, unbuildable "Dyson Sphere," it consists of a vast cloud of independent satellites or habitats that harness massive amounts of stellar power.
The Inspiration: Physicist Freeman Dyson first proposed the concept in 1960. He theorized that highly advanced alien civilizations would require exponentially more energy than a single planet could provide, prompting them to build structures around their host star.
Dyson Sphere vs. Dyson Swarm: Dyson Sphere vs. Dyson Swarm: While a traditional "Dyson sphere" is often imagined in sci-fi as a single, solid shell around a star, this is mechanically impossible due to immense gravitational stresses. A swarm solves this by using millions or billions of independent solar collectors, mirrors, and space habitats traveling in their own individual orbits. MareKromium
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Dyson_Swarm_-_03.jpgThe Dyson Sphere68 visiteHow It Works: each satellite in the Swarm absorbs or reflects the star’s sunlight and beams it to where it is needed—such as to an inhabited planet or orbital space stations.
Uses: the captured energy could power an entire civilization, propel massive spaceships using photon sails, or run planetary-scale supercomputers and artificial intelligence networks.
Materials: constructing a comprehensive Swarm requires a staggering amount of raw materials. Theorists suggest that disassembling an entire rocky planet, like Mercury, could provide enough mass to build the initial stages of a Swarm.
Gradual Build: our Civilization wouldn't build a full Swarm all at once. We would likely start with a "proto-swarm" consisting of space-based solar arrays, expanding it over thousands of years.MareKromium
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Dyson_Swarm_-_04.jpegThe Dyson Swarm76 visiteBecause these megastructures absorb so much starlight, they would emit a unique infrared signature (waste heat). Astronomers look for these anomalies when searching for highly advanced, Extraterrestrial Civilizations (so-called "Technosignatures").MareKromium
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ESP_011543_1665_RED_abrowse.jpgPossible "Megabreccia" in Coprates Chasma (Natural Colors; credits: Lunar Explorer talia)75 visitenessun commentoMareKromium
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PSP_010206_1975_RED_abrowse-00.jpgAncient Bedrock and Megabreccia in Nili Fossae region (ctx frame - possible True Colors; credits: Lunexit)77 visiteThis image captures a record of changing environments on ancient Mars, as recorded in the rock record at Nili Fossae.
In addition to Megabreccia (see the edm that follows), the image shows layered rocks which have been shown by the orbiting spectrometers OMEGA and CRISM to contain Clay minerals. These minerals must have formed in the presence of water, and may have later been transported and deposited here in sedimentary layers.
Most of the layers appear to overlie the exposures of Megabreccia, but some Megabreccia blocks are themselves internally layered, suggesting that sedimentary processes were active here early in Martian History.
Above the clay-bearing layers is a dark, rough-textured rock unit that was emplaced later. Geologic mapping of the Nili Fossae Region has shown this deposit to be a Lava Flow from the Syrtis Major Volcano to the South. The minerals detected in the Lava Flow suggest that liquid water had become rare on the Martian Surface by the time the flow occurred.MareKromium
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PSP_010206_1975_RED_abrowse-01.jpgAncient Bedrock and Megabreccia in Nili Fossae region (edm - possible True Colors; credits: Lunexit)82 visiteThis edm shows a rock type known as Megabreccia, composed of numerous differently colored blocks, each up to 40 meters (130 feet) across, arranged in a seemingly disorganized array.
Megabreccia forms when an energetic event, such as formation of an impact crater, breaks up pre-existing rocks and jumbles their fragments. Megabreccia is found in some of the most ancient rocks exposed on the Martian Surface.MareKromium
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