Joseph R. Tanner

Two spacewalking astronauts resumed construction on the international space station Tuesday for the first time in more than 3½ years, and NASA pronounced the outing a success, even though a small bolt floated away."I felt today like this is what NASA is supposed to do," lead space station flight director John McCullough. "This is what we're here to do."The spacewalk to attach a new 17½-ton box-like truss section included the connecting of 13 wires or tubes and the tightening or loosening of 167 bolts.• Click here to visit FOXNews.com's Space Center.NASA managers downplayed an astronaut's concern about the 1½-inch bolt that came flying free.Astronaut Joe Tanner was working with the bolt, which had an attached spring, when the washer holding it in fell off.The bolt and spring floated over the head of astronaut Heidemarie Stefanyshyn-Piper and skittered across the truss.While the washer went out into space safely, Tanner worried the bolt and spring could get into the truss's wiring and tu...

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