Page last updated at 05:52 GMT, Tuesday, 21 April 2009 06:52 UK

Scientists warn sun has dimmed

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The sun is the dimmest and quietest it has been for a century.

Scientists say images from its surface show a marked decline in events such as sunspots and solar flares, but they say it will not be enough to prevent global warming.

Pallab Ghosh reports.

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