The 18,400-lb. Z-1 truss to be launched by Discovery carries some of the most critical systems on the International Space Station. The 14 X 13 X 14-ft. structure is called Z-1 because it goes on the zenith (up-facing) side of the Node-1 Unity module. It also provides the foundation for the initial massive solar array truss structure. Later, other arrays will be assembled on a different truss to be mounted adjacent to the Z-1.
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