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PostPosted: Sat Jan 13, 2018 8:53 am 
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Joined: Sun Sep 25, 2011 6:45 pm
Posts: 577
Location: Lanoka Harbor, NJ 08734
We had this discussion after our meeting last night. The mirror segments in the new James Webb Space telescope are made of a metal called Beryllium. After beryllium is mined in Utah it then moves across the country for purification, processing and polishing. It is first shipped to Brush Wellman’s facility in Elmore, Ohio, where it is sifted and purified into and "pressed into a flat shape". That shape is used to make two extremely uniform optical mirror blanks. Each mirror blank will be used to make one mirror segment; the full Webb mirror will be made from 18 hexagonal (six-sided) segments. ... llium.html

This compared to the new Giant Magellan Telescope (GMT) mirror segments that are round individually cast glass mirrors. ... -telescope

John Endreson (ASTRA President)

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