Space elevators would be made up of:
- a carbon nanotubes composite ribbon forming a track for the elevator
- a robotic lifter, which would travel up and down the ribbon at 118 miles per hour (190 km/h)
- a mobile anchor station, which would probably be in the equatorial Pacific
- a heavy counterweight in space, at the top of the tether; scientists might use recycled materials to build the counterweight
- a free electron laser station located on or near the anchor station; the laser would beam 2.4 megawatts of energy to photovoltaic cells attached to the lifter, powering conventional niobium-magnet electric motors
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