Raghav NarasimhaCHRIST University, Bangalore, India, Margarita SafonovaIndian Institute of Astrophysics, Bangalore, India, C. SivaramIndian Institute of Astrophysics, Bangalore, India
{"title":"创造适宜居住的世界:行星vs巨型建筑","authors":"Raghav NarasimhaCHRIST University, Bangalore, India, Margarita SafonovaIndian Institute of Astrophysics, Bangalore, India, C. SivaramIndian Institute of Astrophysics, Bangalore, India","doi":"arxiv-2309.06562","DOIUrl":null,"url":null,"abstract":"In 2015, a star KIC 8462852 caught the world's attention due to a paper by\ncitizen scientists who noticed its seemingly unexplainable brightness\nvariations. The forward theory was offered - KIC 8462852 is surrounded by a\nDyson sphere, a megastructure made by an alien civilization to collect all\nenergy output from their star. Finally, in 2018, its light curve showed\nchromaticity more characteristic of the dust (from comets or asteroids) rather\nthan of something made from solid material, but the world was woken up to the\nidea of megastructures. But, in Dyson's time, only Solar System planets were\nknown; it took more than 20 years to realize that nature has no problem making\nplanets and does it with a flair -- the total number of planets in the Galaxy\nis estimated to be in billions. With such abundance of planets, there would be\nno need to destroy the entire planetary system to make one sphere. Instead, a\ncivilization can expand to a system that has planet(s) in the habitable zone\n(HZ), or a planet can be moved into it. Alternatively, a free-floating planet\n(FFP) can be captured and moved into the HZ. These shifts can be performed at a\nconstant low-thrust acceleration using high power directional lasers, resulting\nin a gradual spiral transfer from one orbit to another. We propose here to\nsearch for ETI by looking for high-power laser technosignatures and consider\nmerits of such signatures. We suggest to specifically pay attention to the\nmultiple planetary systems that have Strange Exoplanetary Architectures (SEA) -\nunusual planetary arrangements that cannot be explained by current planetary\nformation theories, because these could be the result of ETI moving planets\nintentionally to suit their needs.","PeriodicalId":501348,"journal":{"name":"arXiv - PHYS - Popular Physics","volume":"7 3","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2023-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Making Habitable Worlds: Planets Versus Megastructures\",\"authors\":\"Raghav NarasimhaCHRIST University, Bangalore, India, Margarita SafonovaIndian Institute of Astrophysics, Bangalore, India, C. SivaramIndian Institute of Astrophysics, Bangalore, India\",\"doi\":\"arxiv-2309.06562\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"In 2015, a star KIC 8462852 caught the world's attention due to a paper by\\ncitizen scientists who noticed its seemingly unexplainable brightness\\nvariations. The forward theory was offered - KIC 8462852 is surrounded by a\\nDyson sphere, a megastructure made by an alien civilization to collect all\\nenergy output from their star. Finally, in 2018, its light curve showed\\nchromaticity more characteristic of the dust (from comets or asteroids) rather\\nthan of something made from solid material, but the world was woken up to the\\nidea of megastructures. But, in Dyson's time, only Solar System planets were\\nknown; it took more than 20 years to realize that nature has no problem making\\nplanets and does it with a flair -- the total number of planets in the Galaxy\\nis estimated to be in billions. With such abundance of planets, there would be\\nno need to destroy the entire planetary system to make one sphere. Instead, a\\ncivilization can expand to a system that has planet(s) in the habitable zone\\n(HZ), or a planet can be moved into it. Alternatively, a free-floating planet\\n(FFP) can be captured and moved into the HZ. These shifts can be performed at a\\nconstant low-thrust acceleration using high power directional lasers, resulting\\nin a gradual spiral transfer from one orbit to another. We propose here to\\nsearch for ETI by looking for high-power laser technosignatures and consider\\nmerits of such signatures. We suggest to specifically pay attention to the\\nmultiple planetary systems that have Strange Exoplanetary Architectures (SEA) -\\nunusual planetary arrangements that cannot be explained by current planetary\\nformation theories, because these could be the result of ETI moving planets\\nintentionally to suit their needs.\",\"PeriodicalId\":501348,\"journal\":{\"name\":\"arXiv - PHYS - Popular Physics\",\"volume\":\"7 3\",\"pages\":\"\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2023-09-08\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"arXiv - PHYS - Popular Physics\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/arxiv-2309.06562\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"arXiv - PHYS - Popular Physics","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/arxiv-2309.06562","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Making Habitable Worlds: Planets Versus Megastructures
In 2015, a star KIC 8462852 caught the world's attention due to a paper by
citizen scientists who noticed its seemingly unexplainable brightness
variations. The forward theory was offered - KIC 8462852 is surrounded by a
Dyson sphere, a megastructure made by an alien civilization to collect all
energy output from their star. Finally, in 2018, its light curve showed
chromaticity more characteristic of the dust (from comets or asteroids) rather
than of something made from solid material, but the world was woken up to the
idea of megastructures. But, in Dyson's time, only Solar System planets were
known; it took more than 20 years to realize that nature has no problem making
planets and does it with a flair -- the total number of planets in the Galaxy
is estimated to be in billions. With such abundance of planets, there would be
no need to destroy the entire planetary system to make one sphere. Instead, a
civilization can expand to a system that has planet(s) in the habitable zone
(HZ), or a planet can be moved into it. Alternatively, a free-floating planet
(FFP) can be captured and moved into the HZ. These shifts can be performed at a
constant low-thrust acceleration using high power directional lasers, resulting
in a gradual spiral transfer from one orbit to another. We propose here to
search for ETI by looking for high-power laser technosignatures and consider
merits of such signatures. We suggest to specifically pay attention to the
multiple planetary systems that have Strange Exoplanetary Architectures (SEA) -
unusual planetary arrangements that cannot be explained by current planetary
formation theories, because these could be the result of ETI moving planets
intentionally to suit their needs.