In this episode of Astrophysics for All, I’m joined by Dr. Rosanna Ruggeri, a cosmologist and honorary research fellow at the University of Queensland. We explore how scientists map the large-scale structure of the universe, what dark energy is, and why understanding it is key to predicting the universe’s ultimate fate. Dr. Ruggeri shares her journey working with cutting-edge instruments like DESI and the Vera Rubin Observatory, and explains how curiosity, coding, and persistence shape a career in science.