Urgent spacewalks to fix ISS pump

[Rick]

The US space agency (Nasa) is planning two emergency spacewalks to repair the cooling system on the International Space Station (ISS).

A pump module in the cooling system failed dramatically last week, forcing crew to reduce power on the space station.

Astronauts will need a minimum of two spacewalks to remove the failed ammonia pump and replace it with a new one.

More: http://www.bbc.co.uk/news/science-environment-10851525