証拠が続々！？幻の9番目の惑星はどこにいったのか？【ゆっくり解説】
Synopsis
なぜ星はみんな丸いのに、銀河は円盤のような形をしているのか？ 本動画では「重力」「角運動量」「星の形成過程」などの視点 ...
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