Discovery Mission STS-119

The crews from space shuttle Discovery and the international space station talk with President Barack Obama via TV downlink Tuesday, March 24, 2009. Front row from left Japan Aerospace Exporation Agency astronaut Koichi Wakata, Greg Chamitoff, Mike Fincke and Sandra Magnus. Center row Lee Archambault, Tony Antonelli and Joseph Acaba. Back row Richard Arnold, Steve Swanson and John Phillip.

Astronaut Joseph Acaba makes a space walk outside the international space station, Monday, March 23, 2009. During the spacewalk, two astronauts were unable to free a jammed equipment shelf outside the space station. They used a hammer and pulled with all their might, but nothing worked. NASA says the repair effort will now fall to station residents or the next shuttle.

Space shuttle Discovery astronaut Steve Swanson participates in the mission's second scheduled session of extravehicular activity (EVA) as construction and maintenance continue on the international space station, Saturday, March 21, 2009.

Space shuttle Discovery crew member Richard Arnold begins his space walk outside the international space station orbiting Earth, Thursday, March 19, 2009. The space walk will be the first of three planned for Discovery's space station visit.

The space shuttle Discovery is docked with the international space station orbiting Earth, Tuesday, March 17, 2009. Discovery is set to deliver one last set of solar wings to bring the orbiting outpost up to full power and will drop off badly needed equipment for the station's water-recycling system and a fresh crew member.

Space shuttle Discovery crew members gather inside the international space station with station crew member Yury Lonchakov, lower left, during a welcoming ceremony after the two space crafts docked while orbiting Earth, Tuesday, March 17, 2009.

View from the space shuttle Discovery as it closes in for docking with the international space station while orbiting Earth, Tuesday, March 17, 2009. Discovery is set to deliver one last set of solar wings to bring the orbiting outpost up to full power and will drop off badly needed equipment for the station's water-recycling system and a fresh crew member.

The space shuttle Discovery thunders off the launch pad Sunday March 15, 2009 at the Kennedy Space Center in Cape Canaveral, Fla.

The space shuttle Discovery and a seven member crew liftoff at the Kennedy Space Center in Cape Canaveral, Fla. on Sunday, March 15, 2009.

With a banner showing the STS-119 crew hanging at the Banana Creek viewing site at the Kennedy Space Center, the space shuttle Discovery and a seven member crew liftoff from Cape Canaveral, Fla. on Sunday, March 15, 2009.

Space shuttle Discovery crew members from left, mission specialist's John Phillips and Steve Swanson, Japan Aerospace Exploration Agency astronaut Koichi Wakata, pilot Tony Antonelli, mission specialist's Richard Arnold and Joseph Acaba and commander Lee Archambault, leave the Operations and Checkout building on their way to launch pad 39A at Kennedy Space Center in Cape Canaveral, Fla., Sunday, March 15, 2009.

Space shuttle Discovery stands ready at pad 39-A in the early morning hours before scheduled evening launch at Kennedy Space Center in Cape Canaveral, Fla., Wednesday, March 11, 2009. Discovery and her crew of seven astronauts were scheduled to lift off on a 14-day mission to the international space station, but the mission was scrubbed due to a fuel leak. The mission was already running a month behind schedule.

Space shuttle Discovery stands ready at Pad 39-A in the early morning hours before a scheduled Wednesday evening launch at Kennedy Space Center in Cape Canaveral, Fla., Wednesday, March 11, 2009. The mission was scrubbed due to a fuel leak.

NASA guests Sophia Borlase, 2 and her brother William, 4, play outside pad 39-A with space shuttle Discovery in the background Tuesday, March 10, 2009, at Kennedy Space Center, in Cape Canaveral, Fla.

The American and orbiter flags wave in the breeze as the space shuttle Discovery sits on Kennedy Space Center's Launch Pad 39-A Monday, March 9, 2009, in Cape Canaveral, Fla.

The space shuttle Discovery sits on Kennedy Space Center's Launch Pad 39-A Monday, March 9, 2009, in Cape Canaveral, Fla.

Space shuttle Discovery crew member astronaut Koichi Wakata of the Japan Aerospace Exploration Agency smiles as he walks along the tarmac of the shuttle landing facility after arriving at the Kennedy Space Center in Cape Canaveral, Fla., Sunday, March 8, 2009. Wakata is scheduled to travel aboard Discovery with six other crew members for a mission to the International Space Station.

The STS-119 crew portrait. From right (front row) are NASA astronauts Lee Archambault, commander, and Tony Antonelli, pilot. From the left (back row) are NASA astronauts Joseph Acaba, John Phillips, Steve Swanson, Richard Arnold and Japan Aerospace Exploration Agency astronaut Koichi Wakata, all mission specialists.

The space shuttle Discovery STS-119 mission patch.