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K2-21c also known as EPIC 206011691 c is an exoplanet orbiting K2-21 a red dwarf, every 15.5 days 212 ly away.〔〔http://exoplanet.eu/catalog/epic-206011691_c/〕 It has a density of 5.40g/cm3 indicating that it could be rocky planet or has heavily compressed volatiles.〔 ==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「K2-21c」の詳細全文を読む スポンサード リンク
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