New astronomical measurements reveal the Milky Way's spiral arms extend farther than previously thought, requiring scientists to revise estimates of the galaxy's total size and mass. The findings refine our understanding of our home galaxy's structure and may influence models of galactic formation and evolution.
Live Science · Thursday, 9 July 2026
New measurements suggest that two of the Milky Way's spiral arms are around 10% farther away from Earth than we thought. The findings may require experts to revise estimates of the total size of our home galaxy.
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