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How large, and how heavy, are the VLT primary mirrors?

heavy large mirrors primary vlt
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How large, and how heavy, are the VLT primary mirrors?

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The VLT mirrors are 8.2 metres in diameter, but only 17.5 cm thick – very thin relative to their size. If you scaled a mirror down to the size of a CD, its thickness would be equivalent to just two discs placed on top of each other. Despite being very thin, the large diameter means the glass weighs 23 tonnes.

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