ec_euclid , #ESAEuclid has started its 2nd de-icing campaign, which in total will last only about a week.
Water molecules 💦 that are inside the instrument cavity from before launch will likely remain there throughout the mission - they freeze 🧊 , but change places over time. We don't want them on mirrors, so once in a while we warm up a mirror 🔥 to sublimate the ice away.
Read more in the new @ec_euclid #blog post: