An aluminium bulkhead of the centre truss segment test article for the International Space Station completes machining at Boeing facilities in Huntington Beach, California. Bulkheads like this are part of the 43-foot-long centre truss segment, designated S0. Nine such segments make up the 360-foot long truss of the station that hold the four massive US solar arrays, cooling radiators, associated electronics and batteries, and connecting lines. The S0 truss segment was anchored atop the US Laboratory module when it launched in early 2000 on STS-105.
© National Aeronautics & Space Administration / Science & Society