{"title":"Ouamuamua (A/2017U1),宇宙中的生源论和智慧生命","authors":"N. Wickramasinghe, D. Wickramasinghe, E. Steele","doi":"10.22606/adap.2019.43005","DOIUrl":null,"url":null,"abstract":"We examine a range of arguments relating to the existence of extraterrestrial life and the possible distribution of intelligent life in the galaxy. It has recently been reported that the object (Ouamuamua (A/2017U1)) that transited the solar system in a hyperbolic orbit exhibits certain features that cannot be readily explained on the basis of it being a naturally-occurring comet or asteroid. The interesting conjecture by Bialy and Loeb that Ouamuamua (A/2017U1) could be an artificial construct of an alien civilization is re-examined. The possibility that Ouamuamua may be a dark cometary body, in which unobserved gaseous emissions may have led to departures from a Keplerian orbit, remains a more conservative alternative possibility. We discuss the implications of the discovery of light sails or similar artifacts, as proposed by Bialy and Loeb, in relation to the validity of galaxy-wide panspermia and the prevalence of life throughout the universe.","PeriodicalId":131060,"journal":{"name":"Advances in Astrophysics","volume":"166 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2019-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Ouamuamua (A/2017U1), Panspermia, and Intelligent Life in the Universe\",\"authors\":\"N. Wickramasinghe, D. Wickramasinghe, E. Steele\",\"doi\":\"10.22606/adap.2019.43005\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"We examine a range of arguments relating to the existence of extraterrestrial life and the possible distribution of intelligent life in the galaxy. It has recently been reported that the object (Ouamuamua (A/2017U1)) that transited the solar system in a hyperbolic orbit exhibits certain features that cannot be readily explained on the basis of it being a naturally-occurring comet or asteroid. The interesting conjecture by Bialy and Loeb that Ouamuamua (A/2017U1) could be an artificial construct of an alien civilization is re-examined. The possibility that Ouamuamua may be a dark cometary body, in which unobserved gaseous emissions may have led to departures from a Keplerian orbit, remains a more conservative alternative possibility. We discuss the implications of the discovery of light sails or similar artifacts, as proposed by Bialy and Loeb, in relation to the validity of galaxy-wide panspermia and the prevalence of life throughout the universe.\",\"PeriodicalId\":131060,\"journal\":{\"name\":\"Advances in Astrophysics\",\"volume\":\"166 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2019-08-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Advances in Astrophysics\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.22606/adap.2019.43005\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Advances in Astrophysics","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.22606/adap.2019.43005","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Ouamuamua (A/2017U1), Panspermia, and Intelligent Life in the Universe
We examine a range of arguments relating to the existence of extraterrestrial life and the possible distribution of intelligent life in the galaxy. It has recently been reported that the object (Ouamuamua (A/2017U1)) that transited the solar system in a hyperbolic orbit exhibits certain features that cannot be readily explained on the basis of it being a naturally-occurring comet or asteroid. The interesting conjecture by Bialy and Loeb that Ouamuamua (A/2017U1) could be an artificial construct of an alien civilization is re-examined. The possibility that Ouamuamua may be a dark cometary body, in which unobserved gaseous emissions may have led to departures from a Keplerian orbit, remains a more conservative alternative possibility. We discuss the implications of the discovery of light sails or similar artifacts, as proposed by Bialy and Loeb, in relation to the validity of galaxy-wide panspermia and the prevalence of life throughout the universe.