Field tests with the Tumbleweed Science Testbed in a quarry in Maastricht in April 2025. Credit: Team Tumbleweed/Sas Schilten A swarm of spherical rovers, blown by the wind like tumbleweeds, could enable large-scale and low-cost exploration of the Martian surface, according to results presented at the Joint Meeting of the Europlanet Science Congress and the Division for Planetary Sciences (EPSC-DPS) 2025. Recent experiments in a state-of-the-art wind tunnel and field tests in a quarry demonstrat...