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SUN, 15 NOV · 71 ITEMS
"These ‘Ghostly’ Galaxies Have Lost Their Dark Matter" — Wired · Science & Medicine
Astronomers have identified a trio of faint, —DF2, DF4, and DF9—that appear to contain almost no , the invisible substance thought to make up most of a galaxy's mass. The leading explanation is that a violent collision with a larger galaxy stripped away their dark matter, leaving only the sparse stars and gas. Ironically, the absence of dark matter in these 'ghostly' galaxies provides some of the strongest evidence yet for its existence, as struggle to explain such a clean separation.
The claim is based on observational studies of DF2, DF4, and DF9 using multiple telescopes, reported by WIRED and Quanta Magazine. The reporting sits close to the primary research (likely papers in astrophysics journals), but as an aggregated/secondary source with no primary cited, the solidity is moderate—the core finding is well-supported by the community, but specific details (e.g., the collision mechanism) are still debated.
Genuinely new: the article was published on November 14, 2026, and the underlying research has been reported in October 2026, making this a current development.
We covered a related story on August 25, 2026, about a ghostly ribbon of stars revealing hidden dark matter, which touches on the same theme of using faint structures to study dark matter.