NASA plans prizes for space breakthroughs

SCOTTSDALE, Ariz. - Borrowing a page from the playbook for the X Prize spaceship competition, NASA has set aside $400,000 over the next two years for competitions to encourage the development of wireless power transmission systems and super-strong tethers.

The Beam Power Challenge and the Tether Challenge, announced here Wednesday, are the first two of NASA's Centennial Challenges, which aim to provide incentives for technological achievements that could be applied to future space exploration.

Although the space agency will put up the prize money, the contests will be administered by the Spaceward Foundation, a California-based group that started planning the contests last year.

"We are thrilled with our partnership with NASA, and we're excited to take the Tether and Beam Power challenges to the next level," said Meekk Shelef, president of the Spaceward Foundation.

Shelef and her colleagues at the foundation hope the contests will advance the concept of a space elevator, which proposes using climbing robots powered by light beams to carry payloads into outer space. Such elevators would travel on tethers extending tens of thousands of miles above the surface of the Earth. If feasible, such a system could dramatically reduce the cost of access to space.

But Brant Sponberg, program manager for the Centennial Challenges, emphasized that NASA was interested in power-beaming and high-strength-to-weight materials rather than the bigger, more speculative space-elevator concept.

"Even if no one builds a space elevator or solar power satellites, it's still of benefit to NASA," he told MSNBC.com at the Flight School conference in Scottsdale.

In the most common power-beaming scenario, energy in the form of light or microwaves is transmitted through space from a power source to remote receivers, where photoelectric cells convert the light energy into electricity. NASA has already tested one such system for keeping unmanned air vehicles aloft, and the technology might come in handy for long-duration aerial reconnaissance missions on Mars. The concept also be used for distributing power from, say, a nuclear power station on the moon or Mars to other outposts.

"We can't take terrestrial power grids to other worlds," Sponberg explained.

As for the tethers, Sponberg said the same super-strong materials could be adapted to make next-generation spacecraft lighter and more resilient. "You can imagine layers of carbon nanotubes being laid down, much like we do with composites today — and that's what we would take away," he said.

NASA is due to announce still more Centennial Challenges in the next few weeks, focusing on other technology areas, Sponberg said.

How the contests would work
Spaceward's Ben Shelef said the foundation hoped to present this year's contest by October in Mountain View, Calif. About 15 teams, mostly from universities, already have signed up to compete.

The Beam Power Challenge requires teams to build a robot climber and power-receiving system capable of raising 55 pounds (25 kilograms) up a 164-foot (50-meter) cable.

For this year's contest, power would be beamed to the climber from a 10-kilowatt searchlight at the bottom of the cable, Ben Shelef said. Contestants would get three tries to send the climber up the cable in three minutes or less, and the climber that carries the most mass under those conditions would win a $50,000 prize, Sponberg said.

Next year, the teams would have to build not only the climber and receiver, but also the power source — for example, a laser or a microwave transmitter, Sponberg said. A $100,000 first prize, as well as a $40,000 second prize and $10,000 third prize, would be offered in 2006.

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