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In addition, the Endeavour astronauts will fly to Kennedy in January to participate in the Terminal Countdown Demonstration Test, or TCDT, to familiarize themselves with the hardware and payload they'll be working with while on the mission.
Endeavour and its crew will deliver a third connecting module, the Tranquility node, to the station and a seven-windowed cupola to be used as a control room for robotics. The mission will feature three spacewalks.