Galactic rotation
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The term "galactic center" refers to the rotation of the Milky Way galaxy around its core. The time it takes to complete one revolution around the galactic center is shorter the closer to the center. Stars near the sun rotate at a speed of about 250 kilometers per second, and complete one revolution in about 200 million years. Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information |
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〘名〙 銀河系がその核を中心にして回転運動を行なっていること。銀河中心を一周する時間は中心付近ほど短い。太陽付近の恒星は一秒間に約二五〇キロメートルの速度で回転し、約二億年で一周する。
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