Japanese firm aims to build space elevator by 2050

A Japanese construction company aims to build an elevator that will reach 96,000 kilometres into space - and it may be ready by 2050.
Japanese construction giant Obayashi said that robotic cars powered by magnetic linear motors will carry people and cargo to a newly-built space station, at a fraction of the cost of rockets.
It will take seven days to get there, the company said.
A space elevator can now become a reality because of the development of carbon nanotechnology, it said.
"The tensile strength is almost a hundred times stronger than steel cable so it's possible," Yoji Ishikawa, a research and development manager at Obayashi told ABC.

Ishikawa admitted that at the moment they can only create carbon nanotubes that are 3 centimetres long, but cables long enough to reach into space may be ready by 2030.

A working space elevator could signal the end of Earth-based rockets which are expensive and dangerous.
Using a space shuttle costs about USD 22,000 per kilogram to take cargo into space. For the space elevator, the estimate is only about USD 200.
Constructing the space elevator would allow small rockets to be housed and launched from stations in space without the need for massive amounts of fuel required to break the Earth's gravitational pull.

Obayashi is working on robotic cars that will carry 30 people up the elevator.