In 2020, astronomers found a white dwarf star blasting through the Milky Way at 2.2 million km/h (1.4 million mph). That’s 8% of the speed of light—fast enough to cross the distance between Earth and the Moon in just 40 seconds. How did it get so fast? It survived a rare “partial supernova,” where its companion star exploded and slingshotted it out of its original orbit. Now it’s a runaway star, doomed to drift through space forever.