Space walk
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Astronauts take part in 'final' space walk

The last spacewalk of the shuttle era has been taking place on the International Space Station (ISS).

The six-and-a-half hour excursion will retrieve an ailing ammonia pump on the ISS, where shuttle Atlantis is docked.

It will also attach the Robotic Refueling Mission to the station.

Commentary courtesy Nasa.

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