In 1979, NASA examined the feasibility of the idea and gave direction to the study of tethered systems, especially tethered satellites. Forward investigated the physics of non-synchronous skyhooks, also known as rotating skyhooks, and performed detailed simulations of tapered rotating tethers that could pick objects off, and place objects onto, the Moon, Mars and other planets, with little loss, or even a net gain of energy. In 1977, Hans Moravec and later Robert L. In the 1970s, Jerome Pearson independently conceived the idea of a space elevator, sometimes referred to as a synchronous tether, and, in particular, analyzed a lunar elevator that can go through the L1 and L2 points, and this was found to be possible with materials then existing. However, given the materials technology of the time, this too was impractical on Earth. This is the space elevator idea, a type of synchronous tether that would rotate with the earth. In 1960, another Russian, Yuri Artsutanov, wrote in greater detail about the idea of a tensile cable to be deployed from a geosynchronous satellite, downwards towards the ground, and upwards away, keeping the cable balanced. However, at the time, there was no realistic way to build it. Konstantin Tsiolkovsky (1857–1935) once proposed a tower so tall that it reached into space, so that it would be held there by the rotation of Earth. Many uses for space tethers have been proposed, including deployment as space elevators, as skyhooks, and for doing propellant-free orbital transfers. Main article: Universal Orbital Support SystemĪ concept for suspending an object from a tether orbiting in space. Five main techniques for employing space tethers are in development: Electrodynamic tethers Tether satellites might be used for various purposes, including research into tether propulsion, tidal stabilization and orbital plasma dynamics.
4.1 Gravitational gradient stabilization.3.1 Momentum exchange tethers, rotating.
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