The astronauts of STS-115 spent a second day outside the International Space Station working to connect up the new P3/P4 truss element. During the 7-hour spacewalk Dan Burbank and Steve MacLean had to remove insulation covers and hundreds of bolts from the truss. The final test will come on Thursday, when the new electricity-generating solar panels are unfurled to their full 13.7-metre (45-foot) length. Once operating, the new panels will double the amount electricity available to the station. The third and final spacewalk will occur on Friday.

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