A research group measures the flow of cosmic rays on the roof of the Institute of Applied Physics.

Links
- https://www.physik-astro.uni-bonn.de/netzwerk-teilchenwelt/en/news/international-cosmic-day-in-bonn/img_4932.jpeg/image_view_fullscreen
- https://www.physik-astro.uni-bonn.de/netzwerk-teilchenwelt/en/news/international-cosmic-day-in-bonn/img_4932.jpeg/@@download/image/IMG_4932.jpeg