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Astronauts inspect craft for damage
CAPE CANAVERAL, Fla. -- Discovery's astronauts inspected their ship's wings and nose Wednesday for any signs of damage after bidding goodbye to the international space station and heading for home.
The shuttle's flawless undocking from the space station ended nine days of linked flight. The space station's newest addition, a 37-foot Japanese lab, was clearly visible as the shuttle flew a victory lap around the orbiting complex.
Shuttle commander Mark Kelly wished all the best to the American and two Russians remaining behind on the space station.
"We hope we left them a better, more capable space station than when we arrived," he said, adding, "Sayonara."
Astronaut Garrett Reisman, leaving the space station after three months, had a few final words for his replacement, Gregory Chamitoff, as Discovery flew away.
"I just want to let you know that you can have all of my uneaten Snickers bars," Reisman radioed.
"Garrett, we found those last night and broke into them. Thanks," Chamitoff said, laughing.
A few hours after parting company, Kelly and his crew pulled out Discovery's 100-foot inspection pole and began running its laser sensors over the wings and nose cap, particularly vulnerable areas during re-entry, coming up Saturday. A gashed wing brought down Columbia in 2003.
The hours-long survey typically is done the day after liftoff to give engineers plenty of time to scour the images for any hint of launch damage. Another briefer inspection usually is done after undocking, to check for any impacts from micrometeorites.
This time, everything was rolled into one.
It will take engineers approximately 30 hours to review all the data, said flight director Matt Abbott. As a result, mission managers aren't expected to clear Discovery for landing until this evening at the earliest. Touchdown is set for late Saturday morning.
A cursory inspection relying solely on the cameras on Discovery's robot arm, conducted June 1, revealed no problems. Photographs taken from the space station of the approaching shuttle also found nothing amiss.
NASA and Japanese space officials were delighted with the way Discovery's mission went.
Besides installing the billion-dollar Kibo lab -- the biggest and fanciest lab up there -- the astronauts delivered a new pump that fixed the space station's broken toilet, replaced an empty nitrogen gas tank, and performed some detective work on a mysteriously clogged, solar wing rotating joint that has hampered energy production for months. NASA expects to replace all the bearings in the joint when the next shuttle visits in November.
"We go into every one of these missions, we plan for the worst and we hope for the best. I don't know if it was statistics or what, but on this particular mission, we got the best," said Kenny Todd, a space station manager.
The addition of Kibo represents "a crowning achievement," not only for Japan but all the space station partners, Todd said. "It's going to go a long way toward helping us implement the science program that's been laid out for us."