Page last updated at 11:39 GMT, Wednesday, 11 November 2009

Galileo 'pathfinders' take shape

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Key milestones are being reached in the preparation of the first four satellites in Europe's Galileo sat-nav system.

The payloads for the so-called In-Orbit Validation models are nearing completion at EADS Astrium in Portsmouth, UK.

Science correspondent Jonathan Amos has been into the cleanroom to inspect the payloads.

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