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Lunar space elevator
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==Fabrication== Because of the Moon's lower gravity and lack of atmosphere, a lunar elevator would have less stringent requirements for the tensile strength of the material making up its cable than an Earth-tethered cable. An Earth-based elevator would require high strength-to-weight materials that are theoretically possible, but not yet fabricated in practice (e.g., [[carbon nanotube]]s). A lunar elevator, however, could be constructed using commercially available mass-produced high-strength para-aramid fibres (such as [[Kevlar]] and [[M5 fiber|M5]]) or [[ultra-high-molecular-weight polyethylene#Fiber|ultra-high-molecular-weight polyethylene fibre]]. Compared to an Earth space elevator, there would be fewer geographic and political restrictions on the location of the surface connection. The connection point of a lunar elevator would not necessarily have to be directly under its center of gravity, and could even be near the poles, where evidence suggests there might be frozen water in deep craters that never see sunlight; if so, this might be collected and converted into rocket fuel.
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