Overview
- Two companion papers published March 12 in Astronomy & Astrophysics present evidence that the Sun moved outward with thousands of similar stars several billion years ago.
- Using ESA’s Gaia data, researchers assembled a 6,594-star solar‑twin catalog—about 30 times larger than previous surveys—drawn from within roughly 1,000 light-years of Earth.
- The catalog’s ages split into a young ~2‑billion‑year group likely formed locally and a broad 4–6‑billion‑year cohort that includes the Sun, which the authors interpret as long‑range migrants.
- The team proposes that migration occurred as the Milky Way’s central bar was forming, temporarily weakening the corotation barrier, with spiral‑arm dynamics and possibly Sagittarius dwarf galaxy passages aiding the shift.
- Independent scientists praise the dataset but warn that selection effects and uncertain timelines could affect the interpretation, including any implications for Earth’s habitability.