By DPA,
Washington : Two astronauts from the Discovery space shuttle began a spacewalk Sunday to carry out further work on the International Space Station (ISS).
Discovery astronauts Mike Fossum and Ron Garan were set to spend more than six hours installing a new nitrogen tank on the ISS and to carry out further work installing a robot arm on the Japanese module Kibo.
It is the third and final spacewalk scheduled during the current 14-day Discovery mission.
Fossum and Garan last Thursday carried out a seven-hour, 11-minute spacewalk installing two video cameras to the Kibo module.
That had been the 111th spacewalk devoted to station assembly and maintenance on the ISS since construction began in 1998.
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