Page last updated at 08:40 GMT, Wednesday, 16 September 2009 09:40 UK

Scientist explains ice mission

Four years on from losing the Cryosat "ice explorer" on launch, the mission team is back for a second attempt with a replacement spacecraft.

Lead scientist Professor Duncan Wingham, from University College London, tells the BBC's Jonathan Amos about the new satellite, Cryosat-2.


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