Page last updated at 18:10 GMT, Monday, 30 March 2009 19:10 UK

Giant laser experiment powers up

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Scientists in the US have finished building the National Ignition Facility - a colossal new physics experiment which aims to recreate the blistering conditions at the heart of the sun.

The laboratory intends to kick-start the reaction by focusing 192 giant laser beams on a tiny pellet of hydrogen fuel.

If it works, the experiment will show for the first time that more energy can be extracted from the process than is required to initiate it.

Footage courtesy National Ignition Facility.

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