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Page last updated at 11:24 GMT, Saturday, 3 January 2009

Artist's impression of a Mars rover (Nasa)
The US space agency's Mars rovers celebrate a longer-than-expected five years investigating the Red Planet.

The controversial idea that space impacts may have wiped out woolly mammoths and early human settlers in North America receives new impetus.

Growth of corals in the Great Barrier Reef has slowed to the most sluggish rate in 400 years, researchers say.

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