Credit: Extreme Tech
Space elevator? Yes — launching payloads into geostationary orbit is very expensive — around $20,000 per kilogramme using current technology. A space elevator could reduce this to $500.
A space elevator would be a cable, tethered at the equator, around 100,000 miles (160,000 km) long, with a counterweight at the end. An elevator car would climb the cable to geostationary orbit at an altitude of 22,236 miles (35,785 km).
What is needed to turn the theory into practice?
● Material for the cable. No existing material is strong enough.
● Energy to drive the elevator car. Energy to drive a conventional elevator is provided by conventional electric wiring to an electric winch which lifts the cable & the elevator car. A space elevator would consist of a stationary cable & an elevator car which would climb the cable. Electric wire or on-board energy supply would be too heavy. Microwave beam(s), possibly from both ends, may provide a solution.
● Design for the elevator car. This has to be a device which can lift its own mass, plus the mass of the payload, up the cable, without damaging the cable.
http://www.extremetech.com/extreme/176625-60000-miles-up-geostationary-space-elevator-could-be-built-by-2035-says-new-study / geostationary orbit GEO new report International Academy of Astronautics IAA carry seven 20-ton payloads tether geostationary geosynchronous orbit anchor two million kilograms payloads detailed case space elevator detailed accounting challenges pay-off cost-per-kilogram launch geostationary orbit geostationary orbit satellites Earth Earth's gravity well cheap Earth-assisted launch mission to Mars tether using small rockets predictably unstable fall loops around the Earth fuel budget base Moon Mars IAA’s projections launch mass different technologies significant investment private sector governments corporations billions installing infrastructure in space investment cheap access to space elevator /
