The U.S. space agency NASA has postponed the launch of space shuttle Discovery to Friday due to bad weather. It was due to lift off today after a two-day delay to resolve technical issues. The 11-day mission is the Discovery program's final scheduled flight, and the fourth and final shuttle mission planned for 2010. The six astronauts for the mission will deliver the Permanent Multipurpose Module (PMM) to the station. Two space walks, for maintenance work and component installation, are scheduled.