The Milky Way Flipped on Its Side: Simulations Tie Our Galaxy's Slow-Spinning Halo to an Ancient Collision
Durham University simulations presented at NAM 2026 suggest the Milky Way's disc reoriented by more than 90 degrees after its head-on collision with Gaia-Sausage-Enceladus, with our galaxy's slowly rotating stellar halo as the tell-tale fingerprint.
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