FILE – Russian cosmonauts Sergei Krikalyov (Top), Yuri Gidzenko and U.S. astronaut Bill Shepherd (C) wave hands before the launch at Baikonur.Shepherd, a former Navy SEAL who served as the station commander, likened it to living on a ship at sea. The three spent most of their time coaxing equipment to work; balky systems made the place too warm. Conditions were primitive, compared with now. Installations and repairs took hours at the new space station, versus minutes on the ground, Krikalev recalled. “Each day seemed to have its own set of challenges,” Shepherd said during a recent NASA panel discussion with his crewmates. The space station has since morphed into a complex that’s almost as long as a football field, with eight miles (13 kilometers) of electrical wiring, an acre of solar panels and three high-tech labs. “It’s 500 tons of stuff zooming around in space, most of which never touched each other until …