Photovoltaic cells, temporarily protected by colored plastic, are seen below as Andrew Williams of the University of Saskatchewan works on his team's entry into the $2 million Space Elevator Games at the NASA Dryden Flight Research Center at Edwards Air Force Base, Calif. , Wednesday, Nov. 4, 2009. In a the test of the concept, robotic machines powered by laser beams will try to climb a cable suspended from a helicopter, on a course 900 meters (2,953 feet) high. AP Photo logo AP Photo 27 months ago

Photovoltaic cells, temporarily protected by colored plastic, are seen below as Andrew Williams of the University of Saskatchewan works on his team's entry into the $2 million Space Elevator Games at the NASA Dryden Flight Research Center at Edwards Air Force Base, Calif. , Wednesday, Nov. 4, 2009. In a the test of the concept, robotic machines powered by laser beams will try to climb a cable suspended from a helicopter, on a course 900 meters (2,953 feet) high.

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