6 astronauts did a spacewalk to address ammonia leaking from the International Space Station . tweeted Chris Hadfield of Canada , the space station 's commander , who choreographed the spacewalk . They inspected the site of the leak and replaced a pump controller box on the orbiter . Afterward , initial tests showed no sign of a continuing leak , which was spotted Thursday , . 5Â½-hour of the 3 men involved in the 6 spacewalk are set to leave for Earth on Thursday .
6 astronauts did a spacewalk to address ammonia leaking from the International Space Station . They inspected the site of the leak and replaced a pump controller box on the orbiter . Afterward , initial tests showed no sign of a continuing leak , which was spotted Thursday , . 5Â½-hour of the 3 men involved in the 6 spacewalk are set to leave for Earth on Thursday .