The radius blocks are being added to 94 stringers, meaning the entire circumference of the external tank will be strengthened by the time all the repairs and modifications are finished.

At NASA's Johnson Space Center in Houston, STS-133 Mission Specialists Alvin Drew and Tim Kopra will rehearse procedures for the mission's second spacewalk in the Neutral Buoyancy Facility, which is the massive swimming pool astronauts use to simulate the weightless conditions of space. The pool is large enough to hold full-scale replicas of International Space Station modules.

Discovery will not launch on the STS-133 mission before Feb. 24, but shuttle managers have not yet chosen a target date for the mission. The schedule depends in part on traffic at the International Space Station during that time frame. A European cargo spacecraft, ATV-2, is scheduled to launch to the station Feb. 15 carrying supplies and equipment.

During space shuttle Discovery's final spaceflight, the STS-133 crew members will take important spare parts to the International Space Station along with the Express Logistics Carrier-4.

STS-134 Update
NASA announced Thursday that astronaut Rick Sturckow will serve as a backup commander for the STS-134 space shuttle mission to facilitate continued training for the crew and support teams during STS-134 Commander Mark Kelly's absence. Kelly's wife, Congresswoman Gabrielle Giffords, was critically wounded in a shooting on Jan. 8 in Tucson, Ariz.

Kelly remains commander of the mission, which is targeted for launch on April 19 from NASA's Kennedy Space Center in Florida.

"I recommended to my management that we take steps now to prepare to complete the mission in my absence, if necessary," Kelly said. "I am very hopeful that I will be in a position to rejoin my STS-134 crew members to finish our training."

"Mark is still the commander of STS-134," said Peggy Whitson, chief of the Astronaut Office.

"He is facing many uncertainties now as he supports Gabrielle, and our goal is to allow him to keep his undistracted attention on his family while allowing preparations for the mission to progress. Designating a backup allows the crew and support team to continue training, and enables Mark to focus on his wife's care."

Sturckow will begin training next week at NASA's Johnson Space Center in Houston with the rest of the STS-134 crew, which includes Pilot Greg H. Johnson, Michael Fincke, Roberto Vittori, Andrew Feustel and Greg Chamitoff. The 14-day mission to the International Space Station will deliver the Alpha Magnetic Spectrometer and spare parts that include two S-band communications antennas, a high-pressure gas tank, additional spare parts for the Dextre robot and micrometeoroid debris shields.

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