CAPE CANAVERAL, FL-The third time was not a charm for NASA today.The launch of the Space Shuttle Endeavour has been postponed until Sunday at 7:13PM so NASA technicians can evaluate the spacecraft after there were as many as 11 lightning strikes in the launch pad area yesterday afternoon.NASA has attempted to launch this mission to the International Space Station, on two attempts prior to today, but they were both scrubbed due to a hydrogen fuel leak problem. There is a 60% change of acceptable weather conditions tomorrow, according to mission officials.

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None of the strikes hit the shuttle or its external tank and solid rocket boosters, but there were strikes to the lightning mast and water tower. The launch pad is equipped with a lightning protection system of wires that is intended to steer bolts away from the shuttle. 

“We’ve seen nothing so far that shows anything affected any of the systems,” said Mike Moses, chairman of the pre-launch Mission Management Team.

Two of the strikes were strong enough to trigger an evaluation by engineers just to make sure all of Endeavour’s systems are ready for flight. Although early evaluations showed no problems, engineers wanted more time to make sure they have checked everything correctly.

“We need to be 100 percent confident that we have a good system across the board,” Moses said.