People
could be gliding up to space on high-tech elevators by 2050 if a Japanese
construction company's ambitious plans come to fruition.
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Tokyo-based
Obayashi Corp. wants to build an operational space elevator by the middle of the century,
Japan's Yomiuri Shimbun newspaper reported Wednesday (Feb. 22).
The device
would carry passengers skyward at about 124 mph (200 kph), delivering them to a
station 22,000 miles (36,000 kilometers) above Earth in a little more than a
week.
In
Obayashi's vision, a cable would be stretched from a spaceport on Earth's
surface up to an altitude of 60,000 miles (96,000 km), or about one-quarter of
the distance between our planet and the moon. A counterweight at its end would
help "anchor" the cable in space.
A
30-passenger car would travel along the cable, possibly using magnetic linear
motors as a means of propulsion, Yomiuri Shimbun reported. Passengers would disembark at the
station, which would house living quarters and laboratory space, along with a
solar-power generation facility capable of transmitting power to the ground.
For
decades, space elevators have been touted by futurists and
science-fiction writers, including Arthur C. Clarke, as an alternative to
expensive (and relatively dangerous) rocket launches. But so far, nobody has
managed to bring the concept into the realm of reality.
One
major hurdle has been finding a material strong and light enough to build the
incredibly long cable. Obayashi's optimism is fueled partly by its belief that
a suitable material has finally been identified — tiny cylindrical structures
called carbon nanotubes, which were first developed in the 1990s.
But
nanotube tech isn't quite ready yet; engineers likely must find a way to
manufacture them more cheaply and efficiently to make space elevators feasible,
company officials said.
Indeed,
the elevator's price tag could be the steepest hurdle to its construction.
"At
this moment, we cannot estimate the cost for the project," an Obayashi
official said, according to Yomiuri Shimbun. "However, we'll try to make
steady progress so that it won't end just up as simply a dream."
Obayashi
is not the only entity taking this dream seriously.
For
example, NASA researchers released a lengthy report more than a decade ago
citing the potential of carbon nanotubes to make space elevators possible. And
the agency has sponsored the Space Elevator Games, a contest to develop precursors to
this longed-for transportation system.
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