In the research, the impact of using Augmented Reality applications in "the Solar System and Beyond unit" of Science lesson on the academic achievement of the students and the opinions of the students on these applications have been examined. 45 students in the 7th grade of an elementary school in the Dilovası district of Kocaeli constitute the study group of the research. In the research, quasi-experimental design with pretest-posttest control group has been used. As data collection tools, the Solar System and Beyond Achievement Test (SSBAT) by the researchers was used. As a result of the data analysis, a significant difference in favour of the experimental group was found.