- Main article: Domus Diaspora
The Inner Colonies were finished and settled in 2390. More and more colonies were continued to be settled. By 2490, the Outer Colonies were effectively established. In the 2500s, the term "outer colony" was used to describe any planet or installation at the edge of Unified Earth Government space.
- Main article: Insurrection
As humanity expanded, the outer colonies began to experience sentiments of autonomy and political independence from the UEG. By the 2400s, the impotence by the UEG to keep the outer colonies felt to many colonists like an interference on a confederation of independent planets. This began to cause a tremendous amount of stress across human controlled space. In 2492, this stress eventually caused many riots on the colony of Far Isle. With the UNSC unable to control it, they used nuclear weapons to put down the riots and declared Code Bandersnatch. This event has been cited as what sparked the Insurrection.
Many different secessionist movements began springing up and the UNSC responded to these threats. The biggest counter insurgency operation by the UNSC was Operation: TREBUCHET.
- Main article: Human-Covenant war
The Covenant had found Harvest in 2525. While there was a small skirmish between UNSC forces and the Covenant beforehand, the war didn't begin until a disastrous first contact. This led to a second battle and a protracted five-year campaign.
Outer Colony Massacres
- Main article: Outer Colony Massacres
However, at that point, the Covenant's genocidal judgement of humanity had spread to many of the other outer colonies like Biko and Green Hills. ONI, however, kept this fact a secret from the rest of the public up until 2526.
By 2530, there were at least 62,154,022 deaths in the Outer Colonies. In 2536, after ten years of war, most of the Outer Colonies had been lost, and the inner colonies were beginning to be attacked. Jericho VII was among the last major ones to fall.
By 2552, though some Outer Colonies still remained in UNSC hands (mostly remote outposts), most were small and rather insignificant worlds. The few significant colonies still under UNSC control lived in constant fear of Covenant invasion. Some of the remaining colonies were bases for outlaws.
By the time the Human-Covenant war ended on March 3, 2553, tensions were already becoming unsteady in the Outer Colonies. On top of this, Covenant remnants were also occupying other parts of the Outer Colonies.
In 2558, after the revelation that John-117 had attacked a peace delegation on Biko, and that ONI abducted children from the outer colonies for the SPARTAN-II program, huge parts of the outer colonies had again started to distrust the UEG. Many turned to the New Colonial Alliance instead.
Following Benjamin Giraud's interruption of a joint UEG Senate and ONI meeting, the Waypoint buoys connecting the inner and outer colonies were shut down. When Benjamin was publicly discredited on ECB, tensions died down and the buoys were turned back on.
- Main article: The Reclamation
Many of the fashions, and likely other elements of their culture, were behind that of the Inner Colonies; having gone out of style some time before.
The Outer Colonies were colonies at the farthest points along slipspace routes and take a long time to reach. Due to the nature of slipspace itself, even systems known to be close to Earth in realspace can be considered outer colonies, such as Harvest in the Epsilon Indi system.
There are at least 590 Outer Colonies. 36 colony worlds, 21 systems, and 2 space station colonies have been mentioned so far.
|23 Librae system||Madrigal||Glassed in 2528|
|The Rubble||Abandoned and destroyed except for Habitat Exodus|
|Alpha Aurigae System||Unknown||Unknown|
|Charybdis system||Charybdis IX||Glassed|
|Circinius system||Circinius IV||Glassed in 2526|
|Chi Ceti system||Chi Ceti IV||Abandoned in 2525, but reoccupied by UNSC in 2558|
|Cygnus system||Cygnus II||Unknown|
|New Jerusalem||Glassed in 2552|
|Elduros system||Aleria||Fallen out of UEG control|
|Epsilon Indi system||Harvest||Glassed in 2525, retaken by UNSC|
|Eridanus system||Eridanus II||Glassed in 2530|
|Eridanus secundus||Destroyed in 2552|
|Mamore||Unknown, likely glassed|
|Escala system||Escala III||Still held|
|Groombridge-1830 system||Unknown||System attacked in 2530, but still held by UNSC|
|Hestia system||Meridian||Glassed in 2551. Under control by the Liang Dortmund company.|
|Lambda Serpentis system||Jericho VII||Glassed in 2535|
|Lambda Aurigae system||Roost||Unknown|
|Orrichon system||Sedra||Shifted away from the UEG during and after the war|
|Procyon system||Arcadia||Attacked in 2531. Destroyed in 2549|
|Sverdlovsk system||Talitsa||Still held|
|XI Boötis A system||Unknown||System attacked in 2528, status otherwise unknown.|
|Biko||Glassed in 2525, in UEG control|
|Bliss||Glassed in 2526, turned into mining world by BXR Mining.|
|Carrow||Lost to Sangheili settlers in 2552, UEG in process of reclaiming planet.|
|Cleyell||Glassed in 2556|
|Coral||Attacked in 2552, most likely glassed|
|Dwarka||Unknown, likely glassed|
|Green Hills||Glassed in 2525|
|Hat Yai||Glassed in either 2528 or 2529|
|Second Base||Glassed in 2525|
|Vodin||Glassed in 2532|
- Halo 3
- Halo: Reach
- Halo Wars
- Halo: The Fall of Reach
- Halo: The Flood
- Halo: First Strike
- Halo: Ghosts of Onyx
- Halo: Contact Harvest
- Halo: The Cole Protocol
- Halo: Evolutions - Essential Tales of the Halo Universe
- i love bees
- Halo Legends
- Halo 5: Guardians
- ↑ 1.0 1.1 1.2 Halo: Warfleet – An Illustrated Guide to the Spacecraft of Halo - page 91
- ↑ 2.0 2.1 2.2 2.3 Xbox.com Halo Storyline (Defunct, Copy on HBO Forums)
- ↑ Halo Encyclopedia, page 45
- ↑ Halo Encyclopedia, page 43
- ↑ Halo: Ghosts of Onyx, page 183
- ↑ Halo Encyclopedia, page 288
- ↑ Halo 4: Forward Unto Dawn
- ↑ Halo: Reach - Collectible: Data Pad 14
- ↑ Halo: First Strike, pages 98-99: And what did the citizens of the Outer Colonies think? Those who hadn't fled to remote outposts and hidden privateer bases weren't in any position to make trouble. The Covenant didn't take prisoners.
- ↑ Halo: Warfleet – An Illustrated Guide to the Spacecraft of Halo - pages 38 & 39
- ↑ 11.0 11.1 Hunt the Truth - Episode 09: Phantoms (Part 1)/(Part 2)
- ↑ Hunt the Truth - Episode 13: In The Bag (Part 1)/(Part 2)
- ↑ Halo 5: Guardians - Level: Guardians
- ↑ Halo: Contact Harvest - page 115
- ↑ Halo: Warfleet - An Illustrated Guide to the Spacecraft of Halo - page 10 & 11
- ↑ Halo: Escalation Issue 17