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The astronauts will enter the station for the first time about 0755 EDT (1155 GMT), where they will be greeted by its crew. The welcome ceremony with the station's three astronauts will not last long, however. The two crews will quickly begin preparations for the first spacewalk - Tuesday's installation of a 16-tonne truss that will support new solar panels. The crews will use the shuttle's robotic arm to hand the truss to the station's arm. NASA says the 11-day mission to boost the power-generating capacity of the ISS entails the most complex work ever undertaken at the nearly eight-year-old orbiting laboratory.