翻訳と辞書 Words near each other ・ Sub-Counties of Kenya ・ Sub-counties of Uganda ・ Sub-culture (song) ・ Sub-Dean ・ Sub-district I of Śródmieście (of Armia Krajowa) ・ Sub-district II of Żoliborz (of Armia Krajowa) ・ Sub-district III of Wola (of Armia Krajowa) ・ Sub-district IV of Ochota (of Armia Krajowa) ・ Sub-district V of Mokotów (of Armia Krajowa) ・ Sub-district VI of Praga (of Armia Krajowa) ・ Sub-district VII of Warsaw suburbs (of Armia Krajowa) ・ Sub-districts of Botswana ・ Sub-divisional inspector ・ Sub-Divisional Magistrate ・ Sub-Doppler cooling ・ Sub-Earth ・ Sub-field dictionary ・ Sub-Gaussian random variable ・ Sub-great bass recorder ・ Sub-group hiding ・ Sub-Himalayan Range ・ Sub-inspector ・ Sub-internship ・ Sub-irrigated planter ・ Sub-lieutenant ・ Sub-Lingual Tablet ・ Sub-loop unbundling ・ Sub-Micro AC Drive ・ Sub-Mycenaean pottery ・ Sub-national autonomous statistical services Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Sub-Earth ： ウィキペディア英語版 Sub-Earth A sub-Earth is a planet "substantially less massive" than Earth and Venus.〔 In the Solar System, this category includes Mercury and Mars. Sub-Earth exoplanets are among the most difficult type to detect because their small sizes and masses produce the weakest signal. Despite the difficulty, one of the first exoplanets found was a sub-Earth around a millisecond pulsar PSR B1257+12. Space observatory Kepler opened the realm of sub-Earths by discovering them. On January 10, 2012, Kepler discovered the first three sub-Earths around an ordinary star, Kepler-42. As of June 2014, Kepler has 45 confirmed planets that are smaller than Earth, with 17 of them being smaller than 0.8 Rⴲ. In addition, there are over 310 planet candidates with an estimated radius of <1Rⴲ, with 135 of them being smaller than 0.8 Rⴲ.〔http://exoplanetarchive.ipac.caltech.edu/〕 Sub-Earths commonly lack substantial atmospheres because of their low gravity and weak magnetic fields, allowing stellar radiation to wear away their atmospheres.〔 Due to their small sizes, and unless there are significant tidal forces when orbiting close to the parent star, sub-Earths also have short periods of geologic activity. == References == 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Sub-Earth」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.