The talk has been cancelled on short notice with a substitute talk already announced.
Please find a brief description of the talk on the German version of this webpage (change languages at the top of the page). The in-person event is held in German. The organizers do not charge any kind of fee. No registration needed, just drop by at the Humboldthaus location (Platz des 17. Juni 2, 02826 Görlitz).
image credit: ESA, CC BY-SA 3.0 IGO