Twice last month, it was for a hydrogen leak, which technicians repaired. Then yesterday's launch was put off before the shuttle was fueled and before astronauts had boarded. Mission managers wanted to analyze data on the shuttle's systems after a series of lightning strikes during a storm on Friday. The verdict: No damage to any system.
This time, the shuttle was fueled up, the astronauts were strapped in, and they were a scant 10 minutes from lift-off when managers nixed the launch for weather reasons.
A line of thundershowers was encroaching on Kennedy Space Center -- too close for comfort, especially if the shuttle had to abort its ascent and return to Kennedy Space Center.
So, Endeavour's launch had been reschedule for July 13 at 6:51 P.M. Eastern Daylight Time. Stay tuned...