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KENNEDY SPACE CENTER, FLA. - NASA Administrator Michael Griffin, right, talks to the STS-115 crew after its return from space. The crew members shown are Mission Specialists Joseph Tanner, Heidemarie Stefanyshyn-Piper and Daniel Burbank. During the mission, astronauts completed three spacewalks to attach the P3/P4 integrated truss structure to the International Space Station. Main gear touchdown was at 6:21:30 a.m. EDT. Nose gear touchdown was at 6:21:36 a.m. and wheel stop was at 6:22:16 a.m. Atlantis traveled 4.9 million miles, landing on orbit 187. Mission elapsed time was 11 days, 19…
