This study was planned to determine the effect of the rebus application developed on astronomy on the cognitive structures and views of gifted students. The research was designed according to phenomenological design, one of the qualitative research methods. In the research, firstly, using the canva programme, which is one of the web 2.0 tools, the rebuses for 25 different astronomy concepts were created and the created rebuses were integrated into the kahoot programme, which is also a web 2.0 tool. The developed application was applied for 8 weeks in the 2022-2023 academic year to 20 gifted students who were studying in a Science and Art Centre (SAC) in the east of Turkey and who were determined by the easily accessible case sampling method. The data of the study were collected with Word Association Test (WAT) and semi-structured interview form. The WAT was administered to all students in the study group before and after the application. The data obtained from the word association test were evaluated by creating frequency and percentage tables. Content analysis method was used to analyse the data collected through interviews. In the study, it was concluded that the application had a positive effect on the cognitive structures of gifted students on astronomy. In addition, the students stated that they learnt new and useful information with the application, enjoyed the process and found the application educational and instructive.