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Untraditional Space Travel
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[QUOTE="bob012345, post: 6542977, member: 575631"] This concept has been explored in detail not for Earth launch because of the atmosphere, but for lunar launch of material for building large space structures. Not a space gun but an [I]electromagnetic[/I] launcher called a Mass Driver. In that case high gee forces are not an issue because humans are not being launched and there are no drag forces. Physicist Gerard K. O'Neill developed the concept in the 1970's to support his vision of building large space colonies. It is interesting that his background was accelerator physics. Solar energy can be used which qualifies as unlimited. [URL='https://en.wikipedia.org/wiki/Mass_driver#:~:text=A%20mass%20driver%20or%20electromagnetic,by%20electricity%20to%20make%20electromagnets']https://en.wikipedia.org/wiki/Mass_driver#:~:text=A mass driver or electromagnetic,by electricity to make electromagnets[/URL]. [/QUOTE]
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