重力の幽霊：太陽系を操る「第9惑星」は実在するのか？
Synopsis
太陽系の最果て、凍てついた暗闇の中で、巨大な「何か」が天体の軌道を歪めている可能性があります。それは伝説の第9惑星な ...
![[睡眠ドキュメンタリー] 科学者が「惑星X」の存在を示す新たな証拠を発見](https://i.ytimg.com/vi/R3jEYOL-9nQ/hq720.jpg?sqp=-oaymwEcCNAFEJQDSFXyq4qpAw4IARUAAIhCGAFwAcABBg==&rs=AOn4CLAOSlGXoTjIztQGsnRPUIIcSXeW8A)
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