News from the space: ammonia air conditioning for International Space Station

Astronauts from the space shuttle Discovery completed a 6-hour spacewalk outside the International Space Station in September 2009, installing a new ammonia refrigerant tank. They removed an 816 kg ammonia tank from a cargo carrier attached to the station and moved it with a robotic arm to its home outside the station. The tank was the largest item ever moved by astronauts during a spacewalk.