I think while the smaller mirror here is Zerodur, the larger one is just borosil... | Hacker News

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		perihelions 6 months ago \| parent \| context \| favorite \| on: Giant, all-seeing telescope is set to revolutioniz... I think while the smaller mirror here is Zerodur, the larger one is just borosilicate, https://astro.arizona.edu/news/rubin-observatory-achieves-an...

IAmBroom 6 months ago [–]

That would be an odd choice.

A large glass mirror once cracked because they "only" allowed one year for it to cool.

The second one was allotted three years.

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