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Astronauts on the first spacewalk of the shuttle Discovery’s mission to the International Space Station freed a new Japanese-made laboratory from its jetty in the shuttle payload bay on Tuesday so that it could be detached.The two spacewalkers, Col. Michael E. Fossum of the Air Force Reserve and Col. Ronald J. Garan Jr. of the Air Force, moved quickly through events to free the laboratory, known as Kibo, Japanese for “hope.” Astronauts inside the station then used a mechanical arm to pluck the bus-size module out of the shuttle and attach it dexterously to the side of the station.Kibo is so large that it has to be taken up in three parts; the first, a small module filled with equipment, was delivered in March. The final part of the laboratory, an out-of-doors policy, will be delivered on a later undertaking. The astronauts also tested methods for onslaught a damaged part of the electrical system, a rotating joint that turn the solar arrays toward the Sun but that has been largely stilled since last year, when vibration in the joint and metal shavings were detected. NASA is still trying to determine the cause of the injure to the joint and how to repair it. While difficult onslaught methods with a scraper, wipes and grease, but, Colonel Fossum explored a spot of damage that turned out to be a depression in the “race ring” that the joint turns on. At a news talks after the spacewalk, Kirk Shireman, the head of the space posting syllabus, said that most of the station administration team had probable that damaged spot to be a divot as unrelated to a raised bump of “pancaked” shavings, and “of the two options, that’s the worst one,” since it wealth that the break to the ring “will most likely propagate” as the joint is operated.On Wednesday, the team will try to repair the station’s toilet, which has developed trouble with urine collection. Even if the spare part ship up from Earth does not work, Mr. Shireman said, there are enough supplies of option devices for collecting urine that the station crew will be able to stay on board the rank until the next supply vehicle arrives in September. Some of those alternatives, like the plastic “Apollo bags,” are not “particularly pleasurable,” he said, but will serve the purpose.Cmdr. Kenneth T. Ham of the Navy, who synchronized the spacewalk, said, “You guys did an awful lot of great work today, and it looked like you were having a lot of fun on the way.”Colonel Fossum respond, “Great labor, quarterback.”