This film, from Twg World, looks at the process of manufacturing glass into sophisticated mirror systems in the world's largest telescopes.
The key points made in the film are:
•Mirrors are made from glass, which is melted and spread over a base.
•Telescopes use mirrors to focus light onto a detector, which allows us to see deep into space.
•The larger a telescope's mirror, the more light it lets in.
•The largest mirror ever made measured 8.4m wide, using 23 metric tonnes of glass.
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