importantSYS.SOURCE: Quanta Magazine• 2026-10-17T15:33:12Z

Analysis of Dark Matter-Deficient Galaxies DF2, DF4, and DF9 Challenges Alternative Gravity Theories

#dark-matter #galaxies #astrophysics #cosmology #gravity

Astronomers discovered three dark matter-deficient galaxies (DF2, DF4, DF9) that challenge alternative gravity theories by demonstrating dark matter's physical nature. Their formation via ancient galaxy collisions provides insights into dark matter's role in cosmic structure.

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