Runaway massive stars mapped across the Milky Wayby Hugo RitmicoMadrid, Spain (SPX) Jan 29, 2026Astronomers have carried out the most extensive observational study so far of massive runaway stars in the Milky Way, combining detailed measurements of how fast these stars move, how rapidly they spin, and whether they live alone or in binary systems. Runaway stars are stars that travel through space at unusually high speeds and gradually drift away from the regions where they formed. For decades, astronomers have debated how massive runaway stars gain these high velocities, generally favoring two main scenarios. Massive runaway stars serve as probes of both their turbulent birth environments and the violent endpoints of stellar evolution. Mapping their properties across the Milky Way is an essential step toward a more complete picture of how massive stars live, die, and shape the cosmos.