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Page last updated at 21:53 GMT, Wednesday, 19 August 2009 22:53 UK

Comet could hold key to life

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Nasa has discovered what could be evidence of life on other planets, in chemicals found in the dust cloud of a comet.

The Stardust spacecraft collected material containing a protein essential for the formation of life from Comet Wild-2, when it was millions of miles away from Earth in 2004.

Pallab Ghosh reports.

READ MORE: 'Life chemical' detected in comet

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