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On Saturday, September 16, 2023 at 4:34:03 AM UTC-6, RichA wrote:
> https://phys.org/news/2023-09-large-space-telescopes.html

Up until now, space telescopes didn`t use adaptive optics.

The article claims that if a space telescope were launched with a 6.5
metre mirror made from a single borosilicate glass blank, though, it
would be needed. Since there`s no atmosphere to worry about, I suppose
the culprit is thermal expansion of the mirror itself.

John Savard
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