During an internship almost ten years ago, I was working on a component of the ESA Exomars 2020 mission. After leaving the company, I occasionally checked the progress of the project. First, there was a delay for the launch of two years. Later, Russia invaded Ucraine. As ESA was cooperating with the Russian space agency, the project was stopped. It has since been rescheduled to 2028.
It was a great learning experience, but I’m still not sure whether the stuff that I worked on at that time will ever be used.