Page last updated at 15:51 GMT, Tuesday, 12 May 2009 16:51 UK

Telescopes ready for rocket ride

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Europe is preparing to launch the 1.9bn-euro Herschel and Planck observatories from the Kourou spaceport in French Guiana.

Jonathan Amos talks to leading figures on the telescope projects, and considers why these astronomical wonders have to operate at such cold temperatures.

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