This learning resource is designed as a warm-up activity in space science, specifically focusing on astronomy. The goal is for students to define astronomy and differentiate it from other scientific disciplines through engaging trivia challenges and self-reflection. The warm-up includes quick trivia questions that assess students' prior knowledge about astronomy, such as the scientific study of stars and the belief in astrology. Additionally, it emphasizes the importance of observation in science, explaining how astronomers utilize tools like telescopes to gather evidence about space. The resource also encourages metacognitive calibration, asking students to articulate reasons why astronomy is classified as a science rather than just a narrative. Overall, this warm-up activity merges retrieval practice with self-reflection to foster a deeper understanding of astronomy.