The purpose of this study is to develop an online interactive learning platform (EASTR) for the topic of astronomy and evaluate its usability among second-year high school physics students in Xihe District. E-ASTR was created using the ADDIE instructional design model, and this study employed a developmental research design. There are five stages in the ADDIE model: analysis, design, development, implementation, and evaluation. Two experts validated E-ASTR after it was developed. Forty-three physics students who did not participate in this study conducted a pilot test. Using cluster random sampling, 58 second-year high school physics students were chosen from among all the students in the Xihe District to make up the research sample. The usability of E-ASTR was assessed in this study using a 20-item usability questionnaire that was modified from the Technology Acceptance Model (TAM). The mean (M) and standard deviation (SD) of descriptive statistics were used to analyze the data. The n.....

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