Space shuttle Endeavour's external fuel tank is being filled with more than 500,000 gallons of liquid hydrogen and liquid oxygen. The three-hour operation began at 11:04 p.m. EDT. The Liquid Hydrogen Low Level Cutoff (LLCO) sensors will go "wet" at about 11:49 p.m. The tank will be completely filled, known as stable replenish, at about 2:04 a.m.

The launch countdown currently is holding at T-3 hours, which will last until 1:45 a.m. EDT.

There still is a 80 percent chance that weather will not affect the 5:40 a.m. launch of STS-127.

STS-127 Mission Overview
The 16-day mission will feature five spacewalks and complete construction of the Japan Aerospace Exploration Agency's Kibo laboratory. Astronauts will attach a platform to the outside of the Japanese module that will allow experiments to be exposed to space.

The STS-127 crew members are Commander Mark Polansky, Pilot Doug Hurley and Mission Specialists Dave Wolf, Christopher Cassidy, Tom Marshburn, Tim Kopra and Canadian Space Agency astronaut Julie Payette. Kopra will join the space station crew and replace Japanese astronaut Koichi Wakata. Wakata will return to Earth on Endeavour to conclude a three-month stay at the station.

STS-127 Additional Resources
› Mission Press Kit (6.3 Mb PDF)
› Mission Summary (484KB PDF)
› Meet the STS-127 Crew
› Flow Valve Fact Sheet (447 Kb PDF)