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A space elevator is a proposed type of planet-to-space transportation system.

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The design would permit vehicles to travel along the cable from a planetary surface, such as the Earth's, directly into space or orbit, without the use of large rockets. With the tether deployed, climbers could repeatedly climb the tether to space by mechanical means, releasing their cargo to orbit. Climbers could also descend the tether to return cargo to the surface from orbit. The concept of a tower reaching geosynchronous orbit was first published in by Konstantin Tsiolkovsky.

Like all buildings, Tsiolkovsky's structure would be under compressionsupporting its weight from below. Sincemost ideas for space elevators have focused on purely tensile structures, with the weight of the system held up from above by centrifugal forces.

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In the go here concepts, a space tether reaches from a large mass the counterweight beyond geostationary orbit to the ground. This structure is held in tension between Earth and the counterweight like an upside-down plumb bob. The cable thickness is adjusted based on tension, it has its maximum at a geostationary orbit and the minimum Conepts the ground. Available materials are not strong enough to make a space elevator practical. The concept is applicable to other planets and celestial bodies. For locations in the solar system with weaker gravity than Earth's such as the Moon or Marsthe strength-to-density requirements for tether materials are not as problematic.

Currently available materials such as Kevlar are strong and light enough that they could be practical as the tether material for elevators there. The key concept of the space elevator appeared in when Russian scientist Konstantin Tsiolkovsky was inspired by the Eiffel Tower in Paris.

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He considered a Whiile tower that reached all the way into space and was built from the ground up to the altitude of 35, kilometers, the height of geostationary orbit. Objects would acquire horizontal velocity due to the Earth's rotation as they rode up the tower, and an object released at the tower's top would have enough horizontal velocity to remain there in geostationary orbit. Tsiolkovsky's conceptual tower was a compression structure, while modern concepts call for a tensile structure more info "tether".

Building a compression structure from the ground up proved an unrealistic task as there was no material in existence with enough compressive strength to support its own weight under such conditions.

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Artsutanov suggested a more feasible proposal. Artsutanov suggested using a geostationary satellite as the base from which to deploy the structure downward. By using a counterweighta cable would be lowered from geostationary orbit to the surface of Earth, while the counterweight was extended from the satellite away from Earth, keeping the cable constantly over the same spot on the surface of the Earth. Artsutanov's idea was introduced to the Russian-speaking public in an interview published in the Sunday supplement of Komsomolskaya Pravda in[17] but was not available in English until much later. He also proposed tapering the cable thickness in order Microecoomics the stress in the cable to remain constant.

This gave a thinner cable at ground level that became thickest at the level of geostationary orbit. Both Microecomomics tower and cable ideas were proposed in David E. Jones ' quasi-humorous Ariadne column in New ScientistDecember 24, InIsaacs, Vine, Bradner and Bachus, four American engineers, reinvented the concept, naming it a "Sky-Hook", and published their analysis in the journal Science.]