Danny Olivas and Christer Fuglesang were nearly an hour late heading out the hatch because of minor spacesuit problems. It was the second spacewalk in three days for the Discovery and space station crews.
Despite the late start, Olivas and Fuglesang quickly accomplished their main objective. They collected the new ammonia tank from Discovery, bolted it onto the space station, then hooked up all the electrical and fluid lines. Mission Control praised their effort.
The old tank, launched seven years ago, was removed during Tuesday night's spacewalk. It will be returned to Earth next week aboard Discovery.
The tanks are big and awkward for spacewalkers to handle: nearly 5 feet long, 7 feet wide and 4 feet high. The new one weighs 1,700 pounds.
The men, both experienced spacewalkers, appeared to have no problem dealing with the tanks. Fuglesang is Swedish.
At one point Wednesday, NASA considered moving Discovery and the space station into another orbit because of the space junk, and possibly even delaying this spacewalk. But by Thursday morning, the track of the debris became clearer and experts were able to say with certainty that the two spacecraft and 13 astronauts were safe where they were.
A third and final spacewalk is scheduled for Saturday.
Discovery is scheduled to undock from the space station Tuesday.
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