Astronauts have been carrying out the third and final spacewalk of their current mission. Joe Tanner and Heidemarie Stefanyshyn-Piper are completing work on new solar energy panels to help restart construction of the half-finished International Space Station. The new solar array will double the amount of electricity available on the station as it expands. Construction of the 100-billion euro complex came to a halt in 2003, when NASA grounded its space shuttles after the Columbia disaster. Now, after more than a billion spent in safety upgrades and two test flights, NASA has an ambitious programme of at least 15 missions to finish the station before the shuttles are retired in 2010.
Space Station repairs remain on target