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类型:纪录  美国  2019 

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Rockets are becoming cheaper and more powerful than ever before thanks to stunning new technologies. As companies like SpaceX and Virgin Galactic make space more accessible, and NASA returns to crewed spaceflight, a new era of space exploration seems to be on the horizon. But will this seeming rocket Renaissance become more than just hype? NOVA explores the latest rocket technologies and the growing role private citizens may have in space.

罗马帝国复兴的游戏功略

今天神特么有比赛



宇宙飞船从地面飞向太空时,为何一定要用多级火箭推动?

因为如果只用一级火箭推动的话,推动力是很有限的,而使用多级推动就可以让它在不同轨道有不同的速度,更容易控制。

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