CAPE CANAVERAL, Fla. -- Space enthusiasts from across the United States and around the world are invited to submit questions about space shuttle Discovery's upcoming launch, its STS-119 mission to the International Space Station, and NASA space exploration. Questions may be answered on NASA Television during the countdown to launch.

Questions can be submitted online at:

http://webcast.ksc.nasa.gov

The STS-119 mission will deliver a new crew member to the space station. The crew also will deliver and install a fourth and final set of large solar arrays that will provide electricity to support six-person station crews beginning in May. Currently, three crew members live aboard the station for several months at a time.

Discovery and its seven astronauts are tentatively targeted to launch March 12 at 8:54 p.m. EDT from NASA's Kennedy Space Center in Florida. NASA commentary will begin about five hours before liftoff.

For more information about the STS-119 crew and mission, visit:

http://www.nasa.gov/shuttle