A space elevator is a theoretical structure designed to transport material from a planet's surface into space.
Many different types of space elevators have been proposed.
They all share the goal of replacing rocket propulsion with the traversal of a fixed structure via a mechanism not unlike an elevator in order to move material into or beyond orbit.
Space elevators have also sometimes been referred to as beanstalks, space bridges, space lifts, space ladders or orbital towers.
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