[1] 太陽系外惑星 - Wikipedia (3/18/2018, 8:08:34 AM) <https://ja.wikipedia.org/wiki/%E5%A4%AA%E9%99%BD%E7%B3%BB%E5%A4%96%E6%83%91%E6%98%9F#.E5.91.BD.E5.90.8D>
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