Trans-orbital_structures Megastructure
one concept space elevator has tethered mobile seagoing platform.
a skyhook long tether hangs down orbit.
a space elevator tether fixed ground, extending beyond geostationary orbital altitude, such centripetal force exceeds gravitational force, leaving structure under slight outward tension.
a space fountain dynamically supported structure held momentum of masses shot top @ high speeds ground.
a launch loop (or lofstrom loop) dynamically supported 2000 km long iron loop projects in arc 80 km ridden maglev cars while achieving orbital velocity.
startram generation 2 maglev launch track extending ground above 96% of atmosphere s mass, supported magnetic levitation.
a rotovator rotating tether lower tip moving in opposite direction tether s orbital velocity, reducing difference in velocity relative ground, , hence reducing velocity of rendezvous; upper tip likewise moving @ greater orbital velocity, allowing propellantless transfer between orbits. around airless world, such moon, lower tip can touch ground 0 horizontal velocity. momentum exchange tether, orbital energy gained or lost in transfer.
^ tether transport leo lunar surface , robert l. forward, 1991, 27th joint propulsion conference, aiaa 91-2322
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