This thesis deals with the topic of processing and popularization of science, namely the field of cosmonautics within the context of the Czech audiovisual media. The first aim of the thesis is to critically analyze the content of selected episodes broadcasted on a science-popular program within the course of the years of 2021-2022. The second aim is to evaluate the use of popularization elements within the selected episodes through an application of suitable comparative methods. The dissertation is divided into a theoretical and a practical part. In the theoretical part of the work, a research was conducted based on Czech and foreign professional literature, with the aim of mapping and describing different approaches to the popularization of science in the media. This has been done by defining the terms science, mass media, scientific journalism and popularization of science within this context. An extensive part of the research is organized in a chronological fashion, encompassing the development and evolution of Czech scientific journalism, with its beginnings in the second half of the 19th century to the present day. This trajectory is analyzed in detail using the examples of two renowned science-popular programs called "Meteor" and "Okna vesmíru dokořán". In the practical part, it has been...