In this photo taken in December 2006 by the space shuttle crew, astronauts Robert Curbeam (United States) and Christer Fuglesang (Sweden) work to attach a
In this photo taken in December 2006 by the space shuttle crew, astronauts Robert Curbeam (United States) and Christer Fuglesang (Sweden) work to attach a new truss segment to the International Space Station and begin to upgrade the power grid. (NASA)