Space shuttle Discovery's final voyage is off until at least the end of the month because of a large fuel leak that forced yet another launch delay.

Mike Moses, left, chair of the Prelaunch Mission Management team, and Launch Director Mike Leinbach talk about the hydrogen leak that scrubbed the scheduled launch of space shuttle Discovery at the Kennedy Space Center in Cape Canaveral, Fla., Friday, Nov. 5, 2010. Discovery will now launch no earlier than Nov. 30.

Space shuttle Discovery is seen on launch pad 39A after Friday's launch was scrubbed because of hydrogen gas leak, at the Kennedy Space Center in Cape Canaveral, Fla., Friday, Nov. 5, 2010. NASA says the next launch attempt will be no earlier than Monday. It's possible, though, the flight may be off until December.

Mike Moses, left, chair of the Prelaunch Mission Management team, and Launch Director Mike Leinbach talk about the hydrogen leak that scrubbed the scheduled launch of space shuttle Discovery at the Kennedy Space Center in Cape Canaveral, Fla., Friday, Nov. 5, 2010. Discovery will now launch no earlier than Nov. 30.

Space shuttle Discovery is seen on pad 39a after a hydrogen gas leak caused NASA to scrub the launch at the Kennedy Space Center, Cape Canaveral, Fla. Friday Nov. 5, 2010. Space shuttle Discovery's final voyage was postponed Friday until the end of the month so NASA can fix a fuel leak.

This image made available by NASA on Friday, Nov. 5, 2010 shows a a 7-inch crack in the insulating foam on the space shuttle Discovery's external fuel tank on the launch pad in Cape Canaveral, Fla. Another launch delay has postponed the Discovery's final voyage is off until at least the end of the month.

Space shuttle Discovery's hydrogen gas connector, seen connected to the external tank, lower right, developed a potentially dangerous hydrogen gas leak which halted the launch countdown, Friday Nov. 5, 2010. Space shuttle Discovery's final voyage was postponed Friday until the end of the month so NASA can fix a fuel leak.

Space shuttle Discovery is seen on launch pad 39A after todays launch was scrubbed because of hydrogen gas leak at the Kennedy Space Center in Cape Canaveral, Fla., Friday, Nov. 5, 2010. NASA says the next launch attempt will be no earlier than Monday. It's possible, though, the flight may be off until December.