Space Shuttle Discovery Launch

Space shuttle Discovery is on pace for a Sunday launch after NASA engineers repaired a leaky gas venting system. The leak had canceled a planned launch on Wednesday. NASA is hoping that the seven-member crew can take off around 7:40 p.m. Sunday on a mission to the international space station, where they will deliver supplies needed to expand the station's crew to six people. The shuttle crew will be delivering the final parts needed for an expanded solar energy power system that will allow the station to double its crew to six people. The crew will also be dropping off Japanese astronaut Koichi Wakata, who will replace NASA's Sandy Magnus on the space station. The shuttle also will carry a replacement for a failed unit in a system that converts urine to drinkable water. The crew, led by commander Lee Archambault, is expected to board Discovery at Kennedy Space Center at Cape Canaveral, Florida, at about 4:30 p.m. Sunday.