# Wide array of small telescopes

**URL:** <https://boards.straightdope.com/t/wide-array-of-small-telescopes/824217>\
**Category:** Factual Questions\
**Created:** [November 8, 2018, 10:23pm UTC](https://boards.straightdope.com/t/wide-array-of-small-telescopes/824217 "2018-11-08T22:23:48Z")\
**Posts on this page:** 2\
**Page:** 3

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**Author:** ![scr4](https://avatars.discourse-cdn.com/v4/letter/s/59ef9b/32.png) [@scr4](https://boards.straightdope.com/u/scr4)\
**Post date:** [November 16, 2018, 10:26pm UTC](https://boards.straightdope.com/t/wide-array-of-small-telescopes/824217/41 "2018-11-16T22:26:06Z")

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> [@Chronos](#):
>
> Nor does it need active, since it’s in zero g.

But the mirror gets polished under 1G, then subjected to several Gs for launch before ending up in zero-G. So space telescope mirrors can benefit from adjustable optics.

And when you go to multi-segment mirrors with folding mechanisms like the JWST, you definitely need adjustable optics - at least to adjust the position & tilt of each mirror segment.

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**Author:** ![GreysonCarlisle](https://avatars.discourse-cdn.com/v4/letter/g/a87d85/32.png) [@GreysonCarlisle](https://boards.straightdope.com/u/GreysonCarlisle)\
**Post date:** [April 10, 2019, 6:18pm UTC](https://boards.straightdope.com/t/wide-array-of-small-telescopes/824217/42 "2019-04-10T18:18:49Z")

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[News today from the Event Horizon Telescope](https://www.nsf.gov/news/special_reports/blackholes/). First ever image of a black hole.

(Skip to 7:30 for the image, to 10:15 for the interferometry.)

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