Distances in the Universe: An Inquiry Lab Sequence Taught in West Africa and North America

Astronomy evokes deep curiosity for many people, making it a beautiful topic for supporting students to learn scientific practices and develop as scientists. We present an inquiry-based lab sequence about distances in the Universe, which we have taught in a first-year astronomy course in Canada and in a summer program for upper-year students in West Africa. Students begin with two warm-up labs where they discover the methods of parallax and the inverse-square law for light to measure distances in their everyday lives. Then they engage in a mini research project in which they ask their own questions about astronomical images, then break down their big questions into smaller questions related to measuring astronomical distances. Students work together in teams to investigate their questions, and finally present their findings to their classmates. Students developing their own questions to investigate is a key scientific practice that is not included in many other inquiry lab curricula. We show evidence that students learned astronomical concepts, had positive feelings about the labs, appreciated the freedom to come up with their own approaches in the labs, and built their self-efficacy as scientists. Since facilitating inquiry is quite different from other kinds of teaching, we describe key features of our facilitation including how we teach new instructors. We describe our curriculum in both Canada and West Africa and offer suggestions for future implementations. We encourage other astronomy instructors to try an inquiry approach to help students develop as scientists while exploring topics they