The concept of space elevators isn't new, but engineering such a structure would be no easy feat, and many other issues besides technology stand in the way.
Japan aims to build a space elevator by 2050Japan's Skytree Tower is tall, but it's nowhere near as big as a space elevator.
AdvertisementAccording to some designs, space elevators would shuttle cargo to orbit on electromagnetic vehicles called climbers.
Other estimates for space elevators in general have put the price at $227 per pound.
For instance, a space elevator's tether would be under such incredible tension that it would be prone to snapping, Johnson said.
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