CNN.com - Date set for?solar spacecraft launch - Jun 7, 2005

Over 24 hours, Cosmos 1 will reach a speed of just 100 miles an hour. But while fuel-powered spacecraft accelerate quickly before cruising at a constant speed, a solar sail would continue to gather momentum, eventually reaching a speed far in excess of anything achieved by conventional spacecraft.CNN.com - Date set for?solar spacecraft launch - Jun 7, 2005