太陽系に於ける原始惑星形成
3 months ago
16
≈紀元前4,547,998,000年
太陽質量が0.08から4未満である太陽に関し、微惑星の衝突・合体の繰り返しにより、現在の水星から火星までの範囲に20個程の原始惑星が誕生する。
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