Live At KSC: NASA Detects Hydrogen Gas Leak

LIVE IMAGES: The images above are from live video feeds at the Air Force 45th Space Wing Weather Squadron weather channel and the Launch Complex 39 area at Kennedy Space Center, where Endeavour and seven astronauts are scheduled to blast off at 5:40 a.m. on an International Space Station assembly mission. They will automatically refresh to the most up-the-minute image every 30 seconds, and you can click to enlarge them.

NASA is confirming that a leak of gaseous hydrogen has been detected at the launch pad. It's uncertain whether this will cause a scrub. But it could. Stay tuned.