Spacewalk to repair ISS

Repairs to the International Space Station began on Saturday morning as

members of the crew suit up and head outside to track down the source of

the ammonia leak discovered on May 9.

Unplanned Spacewalk a 'Precedent-Setting' Move for Space Station Crew

NASA astronauts Chris Cassidy and Tom Marshburn don their NASA-issue Extravehicular Mobility Units for an emergency spacewalk to find an ammonia link outside the International Space Station. Canadian astronaut Chris Hadfield (center) and Russia

Spacewalking Astronauts Hunt for Space Station Ammonia Leak

NASA astronaut Chris Cassidy (striped spacesuit) holds an ammonia pump control box during a spacewalk to hunt for an ammonia leak outside the International Space Station on May 13, 2013. The spacesuit of astronaut Tom Marshburn can be seen behi

Space station repairs planned

Science correspondent Bob McDonald explains how astronauts plan to inspect a leak in the station's cooling system

Space station repairs planned

Science correspondent Bob McDonald explains how astronauts plan to inspect a leak in the station's cooling system

Ammonia leak detected on board ISS

The chemical ammonia, has been found to be leaking on board the International Space Station. NASA have said it will take a space walk to fix it. The commanders have described the situation is serious, but not life-threatening for the six-member crew.

Astronauts Taking Spacewalk to Fix Space Station Ammonia Leak Today: Watch Live

On May 10, 2013, NASA astronaut Terry Virts simulates extravehicular activity in the Johnson Space Center's Neutral Buoyancy Laboratory. His session, in which he was joined by European Space Agency astronaut Samantha Cristoforetti (out of frame

Unplanned Spacewalk a 'Precedent-Setting' Move for Space Station Crew

NASA astronaut Chris Cassidy (striped spacesuit) holds an ammonia pump control box during a spacewalk to hunt for an ammonia leak outside the International Space Station on May 13, 2013. The spacesuit of astronaut Tom Marshburn can be seen behi

Unplanned Spacewalk a 'Precedent-Setting' Move for Space Station Crew

STS-51D mission specialists Jeffrey Hoffman and David Griggs work outside the space shuttle Discovery during NASA's first unplanned spacewalk in April 1985.

Unplanned Spacewalk a 'Precedent-Setting' Move for Space Station Crew

NASA astronauts Tom Marshburn and Chris Cassidy work outside the International Space Station during a spacewalk in 2009. They were paired again for a rare unplanned spacewalk on May 11, 2013.