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Discovery safely returns; questions remain
NASA wants to figure out foam problems before the next launch.
EDWARDS AIR FORCE BASE, Calif. -- Safely back on Earth, though not quite home. Now the shuttle faces an uncertain future.
Signaling its arrival with two thunderous sonic booms, Discovery hurtled out of a black desert sky to a smooth touchdown Tuesday after scrapping four landing attempts at its Florida base because of rain and lightning. The landing at a backup site was met with cheers and palpable relief after a tense two-week mission that raised fears of a Columbia-like disaster.
"Congratulations on a truly spectacular test flight," Mission Control said after Discovery came to a stop on the concrete runway at 5:11 a.m. PDT. "Welcome home, friends."
The mission exposed how vulnerable the shuttle fleet remains, despite a tremendous amount of money and effort invested in the first U.S. manned space mission in the 2 1/2 years since the Columbia tragedy.
Shortly after liftoff July 26, a 1-pound chunk of foam insulation fell from the fuel tank -- the very thing that doomed Columbia -- but it missed Discovery. Still, NASA grounded all shuttle flights until engineers fix the problem.
"We're going to try as hard as we can to get back in space this year," NASA Administrator Michael Griffin said at a post-landing news conference. "But we're not going to go until we're ready to go."
Shuttle managers freely acknowledged the foam mistake, while stressing that the inspection, photography and other shuttle data-gathering systems put in place for this flight worked well. What's more, NASA officials said no severe damage was detected on Discovery while it was in orbit.
"I hope this shows people that we're coming back," NASA spaceflight chief Bill Readdy said from Cape Canaveral, Fla. "We've got some more work to do. We know what we need to do and we'll do it."
The Columbia disaster weighed heavily on everyone's minds as the shuttle made its descent to Earth. Co-pilot James Kelly said he was "honestly hoping that we'd make it farther than they did. And I wished that they had made it all the way home."
Unlike previous Edwards landings, in which throngs of spectators gathered for a shuttle return, the public was barred from viewing Discovery due to increased security after the Sept. 11 terrorist attacks.
The 17,000-mph plunge from orbit took Discovery through a passage of the same kind of intense heating that exposed the mortal wound in Columbia's wing. The shuttle soared across the Pacific and over Southern California, passing just north of Los Angeles on its way to Edwards as it completed a journey that spanned 5.8 million miles and 219 orbits of Earth.
NASA adjusted the flight path in order to skirt Los Angeles because of new safety considerations in the wake of the Columbia disaster, which rained debris onto Texas and Louisiana.
During Discovery's approach, Dr. Jon Clark, a NASA neurologist and husband of Columbia astronaut Laurel Clark, said he quietly remembered his wife and closely compared the two missions.
"I thought, 'This is when the tire light went on,"' Clark said from Kennedy Space Center, referring to an initial sensor reading that Columbia was breaking up. "I was paralleling the two missions."
Two hours after touchdown, the astronauts walked around the shuttle to inspect for possible damages.
"It looks fantastic," Commander Eileen Collins said.
Collins said the United States should continue launching shuttles until the scheduled completion of the international space station in 2010 -- a sentiment echoed by NASA Administrator Michael Griffin.
"Some people say we should stop flying the shuttle because we had an accident -- frankly we've had two accidents -- but we are people who believe in this mission and we are going to continue it," Collins said.
President Bush congratulated the Discovery team.
"It was a great achievement," Bush said. "It was an important step for NASA as it regains the confidence of the American people and begins to transition to the new mission we've set out for NASA."
NASA said it will be a week before Discovery leaves California, riding piggyback atop a modified Boeing 747 back to Cape Canaveral. The cross-country trip is expected to cost the space agency about $1 million.
Of the 111 shuttles that have landed since 1981, 49 came in at Edwards. The last shuttle to land at Edwards was Endeavor in 2002.
Discovery's crew accomplished its main objectives to resupply the international space station and fix broken equipment. The first shuttle to visit the space station since 2002, Discovery spent nine days docked to the orbiting lab.
Astronauts performed two planned spacewalks to test new repair techniques and replace a failed 660-pound, washing machine-sized gyroscope which helped control the station's orientation. It is the first time in three years that all station's gyroscopes were working simultaneously.
In a third unprecedented spacewalk, astronaut Stephen Robinson went beneath Discovery's belly to pull out two protruding thermal tile fillers that engineers on the ground feared could cause overheating during re-entry and lead to another Columbia-type disaster. NASA canceled a fourth spacewalk to repair a torn thermal blanket near the cockpit window, saying that it posed little danger to the shuttle.
Collins said she could not see the torn blanket from orbit, but a ground inspection revealed that it was not significantly damaged.
The switch to landing in California was a big disappointment for the astronauts' families, who had been waiting two weeks to greet their loved ones in Florida. Astronauts planned to reunite with their families on Wednesday, when they all plan to meet in Houston.
In Rochester, N.Y., Collins' 79-year-old father, James, a retired postal worker, described it as "the day of my life."
"We're always the parents of Eileen," he said. "Eileen right now to me belongs to all of us. Right at this point, I can say she belongs to the world."
Associated Press Writer John Antczak contributed to this report.
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