Children start to gain concepts from an early age. They are particularly sensitive to what is happening in their close surroundings. As a result of their daily observations, they can create various conceptual information about the Earth, Sun, and Moon. It is thought that the participation of children in the education process is very important for this information to become basic. The aim of this study is to reveal the variation in knowledge levels about the concepts of the Earth, Sun, and Moon of students who do or do not take preschool education. The research is qualitative, and it was conducted with a total of 40 students aged 6-7. In order to collect the data, we created and used a semi-structured interview form. With this form, students' information about the shapes, movements, colors, and dimensions of the Earth, Sun, and Moon were collected. In the analysis given, content analysis was used, and the answers given were expressed as percentage and frequency. As a result of this study, we concluded that the students who take preschool education were more knowledgeable about the information, expression, explanation, and analogy of the concepts of Earth, Sun, and Moon and their shapes, colors, movements, and dimensions than were the students who did not have a preschool education.