Abstract
Pre-service science teachers in Turkey began to take undergraduate astronomy course in 2010. Science teachers who graduated before 2010 did not have any astronomy course during teacher preparation program. However, science education curriculum has some astronomy topics. If science teachers hold some misconceptions they will most likely transfer them to their students. The aim of this study was to explore in-service science teachers’ astronomy misconceptions. The participants were 60 in-service science teachers who had no astronomy instruction before. Astronomy Concept Test was used to collect data. Based on the results it is found that in-service science teachers hold several misconceptions related to astronomy. The results of this study show that in-service science teachers need some instructional support about astronomy content to improve their understanding of astronomy related topics in middle school science curriculum.