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【天文】月は地球の中心を回っているわけではない…よく分かるアニメーションをJAXAの惑星科学者が作成



1: すらいむ ★ 2021/04/11(日) 18:12:33.33 ID:CAP_USER
月は地球の中心を回っているわけではない…よく分かるアニメーションをJAXAの惑星科学者が作成

地球も月も、地球表面から少しだけ内側に位置する点を中心に回っている。
すべての星系に、こうした点が存在する。共通重心と呼ばれ、星系に含まれる天体全体の質量が完全に均衡する点のことだ。
冥王星とその衛星カロンのように、共通重心が惑星の外側にある星系もある。

月は地球を中心に回っているのか。
その答えは実のところ少し複雑だ。

月は、地球の中心から約4800km離れた点、つまり地球表面のすぐ下にある点を中心に回っている。
地球もまた、その点を中心に揺れるように回っている。

その点は、地球-月系の質量中心であり、共通重心と呼ばれている。
物体(または複数の物体から成るシステム)の質量がすべての方向に均等に分布し、完全にバランスがとれる点のことだ。

(以下略、続きはソースでご確認下さい)

Apr. 11, 2021, 08:30 AM Tech Insider
https://www.businessinsider.jp/post-232459

引用元: ・【天文】月は地球の中心を回っているわけではない…よく分かるアニメーションをJAXAの惑星科学者が作成 [すらいむ★]

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