A Galaxy Nearly All Dark Matter, Revealed by Four Star Clusters
TL;DR Summary
Astronomers have confirmed CDG-2, a faint galaxy in the Perseus cluster detected only through four globular clusters that provide about 16% of its light; by combining data from Hubble, Euclid, and Subaru, they estimate the galaxy’s total luminosity at roughly 6 million suns and a mass composed of 99.94%–99.98% dark matter, making it one of the most dark-matter–dominated galaxies and a valuable natural laboratory for studying dark matter and galaxy formation.
- A Galaxy Composed Almost Entirely of Dark Matter Has Been Confirmed WIRED
- Astronomers Say They've Found Their Strongest Dark Galaxy Candidate Yet ScienceAlert
- Hubble telescope discovers rare galaxy that is 99% dark matter Space
- Dark galaxy CDG-2 near Perseus Cluster (annotated compass image) ESA/Hubble
- This Galaxy Is 99% Dark Matter—and Basically Invisible Gizmodo
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