Page last updated at 08:42 GMT, Friday, 9 April 2010 09:42 UK

Discovery astronauts perform ISS spacewalk

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Space shuttle Discovery astronauts Richard Mastracchio and Clayton Anderson began a six hour spacewalk from the ISS.

The astronauts are replacing an ammonia tank on the outside of the International Space Station.

The mission is due to be completed over three spacewalks.

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