The lack of students’ learning activities and outcomes in class VI-B SDN 4 Panarung is caused by teacher-dominated learning. To overcome this problem, the classroom action research using the think pair share model was applied to the learners. The purpose of the study was to determine the improvement of the student’s activities and learning outcomes on the theme of "Exploring Outer Space" and the subtheme of "Amazing Order". There are three classroom action research cycles applied to 16 sixth-grade students, with each cycle containing: planning, action, observation, and reflection. The data analysis technique used in the study was descriptive, comparing the values of the cycle test with success indicators. The results of this study showed that: (1) The average score of student activity in cycle I was 69, in cycle II was 76.53, and in cycle III was 90.53; (2) The average score of student learning outcomes in cycle I was 65.63, in cycle II was 74.67, and cycle III was 82.14. Thus, it can be concluded that the implementation of the think pair share model can improve student activities and learning outcomes in the theme of “Exploring Outer Space” and the subtheme of “Amazing Order”.