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This research aims to determine the effectiveness of Stellarium as an Interactive Multimedia to students understanding and motivation in learning solar system. This study used quasi experimental design. The sampling used was convenience sampling. The research was conduct in one of private school in Bandung which number of students is 41. The Stellarium used is windows based 0.15.1 version. The Objective Test Item and Questionnaire were used as research instrument. These instruments were given to experimental and control class as pretest and posttest. According to the analyses result, the value of Normalized gain in experimental class and control class is 0.33 and 0.2. According Independent sample test result the hypothesis in this research was accepted. The value of sig (2-tailed) is 0.019 with significance value is 0.05. Thus, the result of this research are: There is different of students- understanding using stellarium in learning solar system; The students- motivation in learning solar system using stellarium is categorized as adequately motivated.