Overview
- University of Arizona researchers report in The Astrophysical Journal that the Small Magellanic Cloud passed through the Large Magellanic Cloud a few hundred million years ago.
- Simulations calibrated to observed masses, gas content, and positions reproduce Hubble and Gaia kinematics, showing gravity from the larger galaxy scrambled SMC stars and pressure destroyed ordered gas rotation.
- New analysis tools indicate prior signs of gas rotation were a line‑of‑sight effect as the galaxy was stretched during the encounter.
- The findings resolve a long‑standing puzzle over the SMC’s lack of ordered stellar rotation documented by Hubble and ESA’s Gaia.
- Researchers say the SMC’s status as a benchmark for early‑universe, low‑metallicity galaxies is now in question, with related 2025 work linking an LMC bar tilt to the SMC’s dark matter content.