Galaxy Collision May Have Stripped Dark Matter From DF2, DF4 and DF9
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Roughly 65 million light-years from Earth, faint galaxies DF2, DF4 and DF9 look ghostly and carry far less dark matter than typical galaxies, Yale astrophysicist Michael Keim notes. Researchers in a June 2026 Astrophysical Journal paper suggest two ordinary galaxies collided: gas and dust merged while dark matter sailed on, leaving three diffuse systems. Their near absence of dark matter is framed as unusually strong evidence that the invisible material is real.
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