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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク RX J0720.4-3125 ： ウィキペディア英語版 RX J0720.4-3125 RX J0720.4-3125 is a neutron star in the constellation Canis Major. It was discovered in 1997 in the ROSAT All-sky survey. Measurement of its parallax leads to an estimate of around 360 parsecs (1174 light-years) for its distance from Earth. It is a member of the Magnificent Seven, a group of neutron stars that are relatively near to our Solar System. RX J0720.4-3125 has a radius of around 5 km. Its spectrum and temperature appear to be mysteriously changing over several years. The nature of the changes are unclear, but it is possible there was an event such as the star's absorption of an accretion disc. ==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「RX J0720.4-3125」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.