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Kepler-20b is an exoplanet orbiting Kepler-20. Its radius is about twice that of Earth, but its mass is between 6.5 and nearly 11 Earth masses. It has a density similar to Earth. Along with the other four planets in the system, Kepler-20b was announced on 20 December 2011. 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「Kepler-20b」の詳細全文を読む スポンサード リンク
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