Eight years after its launch, the BepiColombo spacecraft found itself in a rare convergence of proximity and cosmic timing — passing within 165 kilometers of Mercury's surface at the precise moment a solar eruption tore through the inner solar system. The encounter gave scientists something seldom achieved: a direct measurement of how high-energy solar particles penetrate a weak planetary magnetic field and scar a world's surface with X-rays. Because Mercury's diminished magnetosphere mirrors what Earth might face during a catastrophic solar storm, this fleeting alignment carries consequences