The scope of the book is to give an overview of the history of astroparticle physics, starting with the discovery of cosmic rays (Victor Hess, 1912) and its background (X-ray, radioactivity).
The book focusses on the ways in which physics changes in the course of this history. The following changes run parallel, overlap, and/or interact:
- Discovery of effects like X-rays, radioactivity, cosmic rays, new particles but also  progress  through non-discoveries (monopoles)  etc.
- The change of the description of nature in physics, as consequence of new theoretical questions at the beginning of the 20th century, giving rise to quantum physics, relativity, etc.
- The change of experimental methods, cooperations, disciplinary divisions.
With regard to the latter change, a main topic of the book is to make the specific multi-diciplinary features of astroparticle physics clear.