Bringing anything back from space requires diving back into Earth’s atmosphere at incredibly high speeds, which generates extreme heat. Spacecraft that want to survive the journey must be covered in materials that protect them from that heat, adding extra weight. Because that weight makes getting to space on a rocket more expensive, most spacecraft aren’t designed for a return journey.
这些研究都在逼近一个最为核心的问题：人类，究竟能不能在太空繁衍生息，这也是人类走向深空的必经之路。
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