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SpaceDaily<br /><br />Program managers and the six-member crew of the next space shuttle Atlantis flight will participate in a series of media briefings Friday, Aug. 11, at the Johnson Space Center, Houston. With the remaining shuttle missions, NASA will embark on a series of flights as difficult as any in history to complete the International Space Station.<br /><br />"The flights ahead will be the most complex and challenging we've ever carried out for construction of the International Space Station in orbit," said Mike Suffredini, NASA station program manager. "The station literally becomes a new spacecraft with each assembly mission, and that will be true starting this year with dramatic changes in its cooling and power systems, habitable volume, utilization capability as well as its appearance."<br /><br />The station is nearly halfway through assembly. The next four flights will bring new truss segments, massive structural girders, to the complex. The new segments will increase the mass of the station by almost 40 tons. Two of the trusses include huge sets of solar array wings, totaling more than 17,000 square feet and more than 130,000 solar cells. The new segments include giant rotary joints to allow the tips of the station "backbone" to move as the massive panels track the sun.<br /><br />Together, the new arrays will add 50 kilowatts of power for the complex. The increased electrical power will set the stage for the addition of European and Japanese laboratories that will far surpass any previous research capability in space.<br /><br />The installation of the new truss segments and unfurling of the arrays require unprecedented robotic operations. Those operations will use the shuttle and station's Canadian-built mechanical arms to delicately maneuver school bus-sized station components into place. The operations will rely heavil