Across billions of light-years and billions of years, humanity has long believed it knew the fate of its own galaxy — a collision with Andromeda, inevitable as gravity itself. But a series of studies between 2025 and 2026 has revealed that certainty was always borrowed from imprecision: the odds of a Milky Way-Andromeda merger have swung from near-certain to fifty-fifty and back to ninety percent, not because the galaxies altered their paths, but because our instruments are only beginning to measure those paths with sufficient honesty. The story of this cosmic forecast is, in the end, a story