The giant 121-segment mirror array used to reflect simulated sunlight into the largest vacuum chamber in Europe seen being hoisted into position within ESA’s technical heart back in 1986.
![](https://3c1703fe8d.site.internapcdn.net/newman/csz/news/tmb/2019/imagemirrora.jpg)
Source:
https://phys.org/news/2019-04-image-mirror-array-lss.html