![The Sunshield on NASA's James Webb Space Telescope is the largest part of the observatory five layers of thin membrane that must unfurl reliably in space to precise tolerances. Last week, for The Sunshield on NASA's James Webb Space Telescope is the largest part of the observatory five layers of thin membrane that must unfurl reliably in space to precise tolerances. Last week, for](https://c8.alamy.com/comp/2EY40YE/the-sunshield-on-nasas-james-webb-space-telescope-is-the-largest-part-of-the-observatoryfive-layers-of-thin-membrane-that-must-unfurl-reliably-in-space-to-precise-tolerances-last-week-for-the-first-time-engineers-stacked-and-unfurled-a-full-sized-test-unit-of-the-sunshield-and-it-worked-perfectly-the-sunshield-is-about-the-length-of-a-tennis-court-and-will-be-folded-up-like-an-umbrella-around-the-webb-telescopes-mirrors-and-instruments-during-launch-once-it-reaches-its-orbit-the-webb-telescope-will-receive-a-command-from-earth-to-unfold-and-separate-the-sunshields-fiv-2EY40YE.jpg)
The Sunshield on NASA's James Webb Space Telescope is the largest part of the observatory five layers of thin membrane that must unfurl reliably in space to precise tolerances. Last week, for
![An example Cassegrain telescope system with a primary mirror at F/1.2,... | Download Scientific Diagram An example Cassegrain telescope system with a primary mirror at F/1.2,... | Download Scientific Diagram](https://www.researchgate.net/publication/276499612/figure/fig6/AS:668703930716168@1536442849339/An-example-Cassegrain-telescope-system-with-a-primary-mirror-at-F-12-a-Cassegrain.png)
An example Cassegrain telescope system with a primary mirror at F/1.2,... | Download Scientific Diagram
![optics - Do telescopes exist that reflect the incoming light more than three times along their length? - Astronomy Stack Exchange optics - Do telescopes exist that reflect the incoming light more than three times along their length? - Astronomy Stack Exchange](https://i.stack.imgur.com/nrugT.png)