Johannes Sahlmann, Project Scientist at the European Space Agency (ESA), spoke with Editor Maddie Hall about the Gaia space telescope and its discovery of our Galaxy’s great wave. Can you explain the significance of the great wave discovered by Gaia? It was through these measurements, published in a 2022 data release, that the Great Wave was discovered. What specific questions do you think need to be answered in future research regarding the great wave? Looking ahead, what potential missions or projects do you believe could build upon the findings of the great wave?