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Story summary
- CDG-2, a galaxy in the Perseus cluster, is about 99% dark matter and 1% visible material.
- It lies roughly 245 million light-years from Earth and was identified by the Hubble, Euclid, and Subaru telescopes.
- CDG-2's luminosity equals six million Sun-like stars, with 16% of light from four globular clusters.
- Interacting with nearby galaxies may have stripped the galaxy of much normal matter, informing dark-matter studies.
