American space shuttle Endeavour has blasted off for a construction mission to the International Space Station. It is carrying a former teacher who first trained for space flight with the ill-fated Challenger crew.Endeavour lifted off its seaside launch pad in Florida at 22.36pm GMT.It was the second shuttle launch of the year for NASA.The administration needs to pack in at least another 11 missions to finish building the station before the three remaining space shuttles are retired in 2010. (Sky News)Sky News Video: Space Shuttle Launched
