November 10, 2009 / 3:29 AM / 10 years ago

New solar-sail mission planned after 2005 failure

LOS ANGELES (Reuters) - Backers of a failed mission to launch the world’s first solar-sail spacecraft unveiled plans on Monday to try again five years later with a smaller, swifter satellite to test the limits of sunlight propulsion.

An artists rendering of a Light Sail solar powered sail is shown in this undated publicity image from The Planetary Society released to Reuters November 6, 2009. Backers of a failed mission to launch the world's first solar-sail spacecraft unveiled plans on Monday to try again five years later with a smaller, swifter satellite to test the limits of sunlight propulsion. REUTERS/Handout

The privately funded venture, organized by the Pasadena, California-based Planetary Society, is based on the premise of spaceflight powered not by rocket fuel or chemical propellants but by streams of photons — light particles — pushing against a sail in the vacuum of space.

Some space enthusiasts see solar sailing as a first step in light-powered propulsion technology that may prove the most feasible mode of travel to distant stars.

But experts say the technology has nearer-term applications in establishing permanent solar weather stations for monitoring magnetic storms on the sun that can wreak havoc on Earth-bound communication networks and electrical grids.

The project grew out of an idea imagined by the society’s co-founders — executive director Louis Friedman and late astronomer and author Carl Sagan — to send a solar sail craft to rendezvous with Halley’s Comet in the 1970s.

The first attempt to launch such a space vehicle, dubbed Cosmos 1, ended in disaster when a Russian rocket that was supposed to carry it into orbit malfunctioned shortly after liftoff from a submarine in the Barents Sea in June 2005.

Organizers have since redesigned the spacecraft. The new LightSail vehicle, the size of a loaf of bread, is smaller and 20 times more lightweight than Cosmos but built to accelerate more quickly once its aluminum Mylar sail is unfurled in high orbit, 500 miles or more above Earth.

That’s about twice as high as the usual orbit of NASA’s space shuttle, said the Planetary Society’s Bruce Betts.

The sail consists of four triangular blades that combine into one large square about 16 feet wide and 5 microns thick — one-quarter the thickness of a plastic trash bag.

No launch date has been set. But backers plan to have the LightSail-1 ready to go as early as the end of 2010. They are looking at various U.S. or Russian launch options, Betts said.

Once LightSail reaches its initial orbit, mission controllers will test its novel propulsion system by trying to use the force of sunlight exerted against the craft’s sail to push the satellite higher above Earth, Betts said.

Subsequent missions of LightSail-2 and LightSail-3 will seek to demonstrate longer-duration flights to even higher orbits, and ultimately to a point beyond Earth orbit that affords better observation of the sun.

Ultimately, for voyages deep into space away from the sun, the spacecraft would need additional propulsion supplied by a laser beam directed at its sail from Earth to supplement fading sunlight reaching the vehicle, Betts said.

Editing by Eric Beech

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