Как Спутники Летают Вокруг Земли?（原声文稿）
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Right over your head, the International Space Station is hurtling past It weighs about 420 tons, is roughly a football field long, and people live and work inside This station is constantly falling toward Earth It's been falling nonstop for over 25 years, yet never actually fallen What saves it isn't altitude, it's speed If it suddenly stopped in orbit, it would crash within minutes And it's not just the station.