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How much aluminium is needed to cover the surface of the VLT´s mirrors?

April 26, 2017Aluminium cover mirrors needed

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How much aluminium is needed to cover the surface of the VLT´s mirrors?

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The amount of aluminium needed to coat a single VLT primary mirror is about 12 grams, which is less than the amount in a soft drink can. Although the layer covers the whole of the mirror’s 8.2-metre diameter, it is spread only 80 nanometres thick.