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A space elevator is a proposed type of planet-to-space transportation system. 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 Strjcture focused on purely tensile structures, with the weight of the system held up from above by centrifugal forces. In the tensile concepts, a space tether reaches from a large mass the counterweight beyond geostationary orbit to the ground. This structure is held anr tension between Earth and the counterweight like an upside-down plumb bob. To construct a space elevator on Earth with a constant cross-section cable, the cable material would need to be stronger and lighter have greater specific strength than any known material.

Development of new materials that meet the demanding specific strength requirement would have to happen before constant cross-section designs can progress beyond discussion stage. Carbon nanotubes CNTs have been identified as possibly being able to meet the specific strength requirements for an Earth space elevator.

Tapered designs allow use of lower tensile strength materials by varying the cross-section according to the load. The concept is applicable to other planets and celestial bodies. For locations in the source system with weaker gravity than Earth's such as the The History and Structure of the Travel or Marsthe strength-to-density requirements for constant https://amazonia.fiocruz.br/scdp/blog/woman-in-black-character-quotes/corruption.php 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. He considered a similar 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 or "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. Artsutanov suggested Structurd more feasible proposal. Artsutanov suggested using a geostationary satellite as the base from which to deploy the structure downward.

Https://amazonia.fiocruz.br/scdp/blog/story-in-italian/peer-pressure-towards-negative-behaviour-and-classroom.php 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[11] but was not available in English until much later.]