Summary:
- Astronomers have discovered a "dark galaxy" - a galaxy that contains very little or no visible matter, but is still detectable through its gravitational effects on nearby objects.
- This dark galaxy is located within a globular cluster, which is a dense group of old stars. Globular clusters are typically found orbiting the outskirts of galaxies.
- The discovery of this dark galaxy within a globular cluster challenges our understanding of how galaxies and globular clusters form and evolve, and provides new insights into the nature of dark matter.