--------------------------------------------Launch Date Sunday March 15 (15 March 2009 18:49:00 EST)
Countdown clocks began ticking down on Sunday for NASA's first space shuttle launch of the year, a mission meant to complete the International Space Station's power system and exterior beams.
Shuttle Discovery is scheduled for liftoff at 9:20 p.m. EDT Sunday from the Kennedy Space Center in Florida. Astronauts plan to deliver and install a final set of solar wing panels and transport Japan's first live-aboard station crewmember to his new home.
The flight has been on hold since February 12 as engineers and managers reviewed a possible safety issue with valves needed to keep the fuel tank properly pressurized during the 8.5-minute ride into orbit. NASA replaced the valves and cleared the launch team to begin the three-day countdown.
A final review is scheduled for Monday. There were no outstanding technical issues, however, and meteorologists were forecasting a 90 percent likelihood the weather will be suitable for launching.
Have you ever wondered how the Astronauts arrive at Kennedy Space Center?
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