A Giant, Slow-Motion Bubble: Tracing a Long-Lived Superbubble Across the Perseus Arm

This paper studies the Giant Oval Cavity, the largest known superbubble in the Milky Way, stretching across the Perseus spiral arm. By tracking the motions of young, massive stars, the authors show that the cavity is slowly expanding and extremely long-lived. Repeated supernova explosions continually supply energy, allowing the structure to survive despite Galactic turbulence and shear.