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The space shuttle is expected to launch at about 9.20pm Eastern Time.
Watch the NASA Webcast giving details of this mission.
More details regarding this mission:
STS-119 will deliver the S6 solar arrays to the space station, completing the construction of the Integrated Truss Structure. STS-119 will be used for several experiments, including Shuttle Ionospheric Modification with Pulsed Local EXhaust (SIMPLEX), Shuttle Exhaust Ion Turbulence Experiments (SEITE), and Maui Analysis of Upper Atmospheric Injections (MAUI). STS-119 will also be used for the the "Boundary Layer Transition Detailed Test Objective" experiment. One tile in the thermal protection system will be raised 0.25 inches (6.4 mm) above the others so that, at about Mach 15 during reentry, a boundary layer transition will be initiated.