Two astronauts from the Discovery space shuttle began a spacewalk Sunday to carry out further work on the International Space Station (ISS), DPA reported. 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 7-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.
