Page last updated at 18:26 GMT, Saturday, 16 May 2009 19:26 UK

'Toughest' spacewalk yet

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Astronauts from space shuttle Atlantis have been conducting the third of five spacewalks to repair the Hubble Space telescope.

Mission specialists John Grunsfeld and Andrew Feustel will attempt to fix a broken camera and install an instrument which will help reveal the chemical makeup of the universe.

Laura Sheeter reports.

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