Space Video Clips

ESA has some great resources for kids, such as "Paxis Adventures": https://www.esa.int/kids/de/Multimedia

On TV, there's Bayern Alpha (German only, though Space Night is mostly music and space images):
https://www.ardalpha.de/wissen/weltall/index.html

On YouTube, the KurzGesagt – In a NutShell channel (space and science): https://www.youtube.com/@Kurzgesagt

Or without ads in the ARD Media Library (in German):
https://www.ardmediathek.de/suche/kurzgesagt