Spacewalkers Prep New Station Truss

Atlantis astronauts Heide Stefanyshyn-Piper and Joe Tanner worked in space for more than 6 hours Tuesday to prepare the International Space Station's newly installed P3/P4 truss for operation. The 17-ton segment will add a set of giant solar panels and batteries, doubling the station's power capabilities. Astronauts Daniel Burbank and Steve MacLean make another spacewalk Wednesday to prepare the Solar Alpha Rotary Joint, which will turn the new solar arrays to track the sun. [ Visit Website ]