Expedition Six Crew in Star City for Rehab Expedition Six Commander Ken Bowersox, Flight Engineer Nikolai Budarin and NASA ISS Science Officer Don Pettit are at the Gagarin Cosmonaut Training Center in Star City, Russia, where they are undergoing physical rehabilitation. This post-mission activity is being performed to help the crew get adjusted to life on Earth after spending more then 5 1/2 months in a microgravity environment. The trio landed in Kazakhstan at 9:07 p.m. CDT Saturday (0207 GMT Sunday). The landing was the first time NASA astronauts have returned to Earth on a Soyuz. Bowersox and Pettit are slated to return to Houston, Texas, in mid-May. Aboard the International Space Station, Expedition Seven Commander Yuri Malenchenko and NASA ISS Science Officer Ed Lu are taking a well-deserved day off after spending six days in handover activities with the Expedition Six crew. They arrived at the station on April 28, and assumed control of the orbital outpost Saturday