Groombridge 1830 system
The Groombridge 1830 System is a UNSC-colonized star system, located 29.7 light years from Sol. The colony world of Groombridge-1830 is located in the system. It was invaded on December 24, 2530 by the Covenant. Admiral Preston Cole's fleet responded, destroying the Covenant fleet, but taking heavy casualties during the battle. The colony's fate, whether it was glassed or not, and the state of any survivors, is unknown.
 List of appearances
- Halo Wars: Genesis (First appearance)
- Halo: Evolutions - Essential Tales of the Halo Universe
- Halo: The Fall of Reach (2010)
- Halo: Reach
- Dr. Halsey's personal journal (Mentioned only)