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🌍 どの惑星が最も近いですか?
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もし金星と火星の軌道が入れ替わったらどうなるでしょうか?
小惑星を衝突させて火星を地球に近づけることはできるのか?
Why Don’t We Explore Venus When It Is Much Closer to Earth than Mars?
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火星が地球に近づいたらどうなる? |明らかにされました