[LINK] Kim Groshong, New Scientist
A slim cable for a space elevator has been built stretching a mile
into the sky, enabling robots to scrabble some way up and down the line.
LiftPort
Group, a private US company on a quest to build a space elevator by
April 2018, stretched the strong carbon ribbon [5cm wide and 6 sheets of paper thick] 1 mile (1.6 km) into the
sky from the Arizona desert outside Phoenix in January tests, it
announced on Monday.
The company's lofty
objective will sound familiar to followers of NASA's Centennial
Challenges programme. The desired outcome is a 62,000-mile (99,779 km)
tether that robotic lifters – powered by laser beams from Earth – can
climb, ferrying cargo, satellites and eventually people into space.
The
recent test followed a September 2005 demonstration in which LiftPort's
robots climbed 300 metres of ribbon tethered to the Earth and pulled
taut by a large balloon. This time around, the company tested an
improved cable pulled aloft by three balloons.
When A-C-E first reported on this intriguing concept a year or two ago, some scientists were scoffing at the idea, saying only fractions of inches of the needed material had been created in labs to date. Looks like progress has been made. But, they've still got 59,999 miles to go. A string that long will have to be very light, or have a very heavy orbiting anchor its weight cannot pull down (if I understand the physics correctly).
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