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.
https://phys.org/news/2023-09-large-space-telescopes.html
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
Changes to Beryllium (what the Webb has) with temperature are probably
more than borosilicate glass. But the Webb has its heat shield.
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