Key technology for ESA’s exoplanet-hunting Plato spacecraft has passed a trial by vacuum to prove the mission will work as planned. This test replica of an 80-cm high, 12-cm aperture camera spent 17 days inside a thermal vacuum chamber.

For further details see ESA press article:

https://www.esa.int/ESA_Multimedia/Images/2021/03/Planet-hunting_eye_of_Plato