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A new ammonia tank was successfully installed on the space station by the astronauts from the space shuttle Discovery on Friday. The astronauts took about 6 hours to complete the space walk .The ammonia tank is used in the cooling system.
The US astronaut John "Danny" Olivas and Swede Christer Fuglesang ended their mission successfully at 0451 GMT. The planned mission got delayed by an hour due to problems with a communications device in Olivas' spacesuit.
The pair 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.
Much of the work involved connecting bolts and cables to hook the tank into the station's cooling system.
The robotic arm of the space station was operated by Kevin Ford and Nicole Stott operated the robotic arm.
Olivas and Stott had removed an empty ammonia tank from the station earlier this week. The old tank will be brought back to Earth at the end of the shuttle's mission.
The planned 13-day mission is designed to transport new equipment and experiments to the space station.
