When your mirror gets dirty at home, you can just grab a cloth and some spray to clean it. But what about the ultra-precise, reflective mirrors of telescopes? 🤔
Things can get a bit more complex. This image shows you part of the cleaning process for the main mirror of the ESO 3.6-metre Telescope at La Silla Observatory, #Chile.
Discover how it's done: https://www.eso.org/public/images/potw2524a/
Do you want to learn more about how we clean telescope mirrors? Then check out this blog post: https://www.eso.org/public/blog/exploding-snow/
📷 A. Silber/ESO