Traction
发表于 2025-3-21 17:43:54
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懒惰民族
发表于 2025-3-22 00:13:27
Space Beanstalks,ilometers in the evelator, you too would bes in orbit around the Earth—and paying just the cost of the electricity operating the elevator to get you there. And this would all be as effortless on your part, and as reliable, as the flight of skylark.
miscreant
发表于 2025-3-22 02:28:14
Human Exploration,ture for sustained lunar exploration and operations. Having gone to the Moon in the 1960s with 1940s rocket propulsion technology, one could imagine a 2015 human lunar using solar- and nuclear-thermal rockets, solar-electric- propelled cargo tugs efficiently carrying cargo from low Earth orbit, and piloted vehicles Space Station.
痛苦一下
发表于 2025-3-22 05:50:09
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Gratulate
发表于 2025-3-22 11:57:03
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可能性
发表于 2025-3-22 16:40:40
The Old Frontier,l Africa to populate Eurasia and Australia. More recently, perhaps 13,000 years ago, the remote descendents of these early pioneers crossed am Ice Age land bridge between Siberia and Alaska to begin thes human occupation of the New World.
incisive
发表于 2025-3-22 18:41:18
The New Frontier,scopes and space probes have returned photos of the strange environments of other solar-system worlds. Where in neary space might human settlements best be established and how might humans and their descendents live in the these strange new environments?
头脑冷静
发表于 2025-3-22 23:01:08
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PET-scan
发表于 2025-3-23 02:51:10
,Probes to the Planets:Where We’ve Been on Our Journey, reconnaissance of the solar system. This was a very heady time for space scientist—war rockets, launched iln a superpower competition, would actually be used to study, at close range, properties of distant worlds.
要求比…更好
发表于 2025-3-23 07:41:50
Thinking Interstellar,xplored, though a mission to do so dubbed, “New Horizons”, is on its way to that distance—distances so vast that they cannot be easily comprehended; distances so large that we have to invent new units of measure in order to even readily discuss them.