Space colonization - Wikipedia, the free encyclopedia - 0 views
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Callie S on 13 Feb 14Kaku talks about space colonization in the future. "Space colonization (also called space settlement, or extraterrestrial colonization) is permanent human habitation outside of Earth. Many arguments have been made for space colonization. A common one is ensuring the survival of human civilization and Earth's biosphere from disasters such as asteroid impact or global nuclear war. Another is helping to provide unlimited space-based solar power and other resources to let all human beings on Earth enjoy developed-world lifestyles with far less environmental damage, and eventually providing a High Frontier where any number of people may settle and thrive. After its successful Apollo project moon landings, the US NASA sponsored the first formal engineering studies of a space colony concept: Princeton professor Gerard O'Neill and colleagues' proposals to build space colonies and Solar Power Satellites (SPS) from lunar materials.[1][2] These proposals are striking for their boldness, level of detail and technical rigor. The thickness of metal beams needed to contain the colony's atmosphere and withstand rotation for artificial gravity was engineered. Chemical reactions to smelt them out of Moon rocks were worked out (by a young K. Eric Drexler, who later became famous as the founder of Nanotechnology).[3] The Moon rocks would be launched to the desired orbital location cheaply using O'Neill's electromagnetic mass driver. Modifying standard 1970s industrial productivity figures as needed (work in space suits would be slower; moving heavy objects in weightlessness easier than in factories on Earth), they estimated that the 10,000-person workforce housed in the first Island One colony could produce one giant SPS-capable of supplying 5% of total American electricity demand-each year. Yet the project timeline didn't call for producing the first commercial SPS until Year 22, and the huge investment-totaling almost $200 billion in 1975 dollars-wouldn't be fully repaid unt