The world's first solar sail spacecraft takes flight, launched by space enthusiasts who cobbled the privately funded mission together on $4 million and an untested theory that light can power limitless space exploration. Cosmos 1, a disc-shaped craft whose two segmented sails suggest flower petals, is set to blast off from a submerged Russian submarine in the Barents Sea. Mission controllers hope to fill each sail's four 49-foot segments with streams of photons, or light particles, emanating from the sun to lift Cosmos 1 to a higher orbit.