Summary:
- Astronomers have discovered a large clump of gas in the Milky Way galaxy that appears to be a "dark galaxy" - a galaxy that contains very little or no stars.
- This dark galaxy is about 3,000 light-years across and contains about the same amount of mass as 100 million Suns, but it is not emitting any visible light.
- The discovery of this dark galaxy provides new insights into the formation and evolution of galaxies, as well as the nature of dark matter, which makes up the majority of the matter in the universe but is invisible to telescopes.