NASA scrubs Endeavour launch for mission STS 127 from the Kennedy Space Center, Florida

Retired NASA Launch Director Robert Sieck, right, talks with Associate Administrator for Space Operations Bill Gerstenmaier in firing room four at the Kennedy Space Center in Cape Canaveral, Florida, Sunday, July 12, 2009 during the built-in count down hold for the launch of the space shuttle Endeavour and the crew of the STS-127 mission. NASA scrubbed the launch today due to weather and will try again on July 13. (UPI Photo/Bill Ingalls/NASA)