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Page last updated at 06:40 GMT, Thursday, 8 April 2010 07:40 UK

Ice explorer set for lift-off


A British-led satellite mission is to be launched today to try to answer one of the most challenging environmental questions - how rapidly are the polar ice-sheets changing.

The satellite, CryoSat, will scan the Arctic and Antarctic with a radar system.

From mission control David Shukman reports.

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