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Giant space mirror's crucial step

BBC Science

Scientists have completed a significant part of what will become the largest mirror ever put into a space telescope.

It will be launched into space in the European Space Agency's Herschel Space Observatory in 2007 and will study the Cosmos by gathering infrared radiation.

The mirror is made of silicon carbide, an advanced ceramic material, and will be 3.5 metres across. This will make it lighter than if it was made of metal.

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