A hydrogen gas leak has forced NASA to call off the launch of the space shuttle for the second time in less than a week, AP reports. The glitch, discovered just hours before blastoff, means Endeavour's mission to the International Space Station will now be delayed until July 11 because of unfavorable sun angles.
NASA officials said the potentially dangerous leak was in the same place as the one that delayed Saturday's launch, but the cause of the problem has not been discovered. The shuttle and its crew of seven are due to deliver hundreds of pounds of food to the space station, along with the final segment of Japan's gigantic space station lab.
(More NASA stories.)