冷峻 发表于 2025-3-27 00:02:20
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Getting around the Inner Solar System takes less rocket fuel to send an automated spacecraft to the surface of Mars than to the surface of the moon. In this sense, Mars is “closer” to the earth than the moon is, though in terms of distance Mars is well over ten times as far away even when it makes its closest approach to the earth.粉笔 发表于 2025-3-27 15:48:07
Space Industrializationle to tell whether such industrial activities will be profitable, it’s also hard to predict whether people will be needed. Even so, a few sensible comments can be made about which destinations in the solar system seem to make the most sense.GUILE 发表于 2025-3-27 19:38:32
The Necessities of Lifeditioned so that the only clothing which is needed is that required to preserve the customary human decency, and so the traditional need for clothing and shelter is transformed into the need to create and maintain a space environment which is suitably cool.Ascendancy 发表于 2025-3-27 22:26:11
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http://image.papertrans.cn/h/image/429901.jpg陈列 发表于 2025-3-28 12:32:49
https://doi.org/10.1007/978-1-4899-6104-421st century; humans; research; space