Editing Orion Arm

{{Status|Canon}}
{{Wikipedia}}
[[File:Halo Starscope - Orion Arm.jpg|thumb|250px|A view of the Orion Arm.]]

The '''Orion Arm''', also referred to as the '''Orion Spur''',<ref name="warfleet">''Halo: Warfleet'', p. 12-13</ref> is a spiral escalation of a minor spiral arm in the [[Milky Way]] galaxy that is approximately 3,500 light-years across and 10,000 light-years in length. It is located near the galactic core, between the [[Sagittarius Arm]] and the [[Perseus Arm]]. The Orion Arm is most notably home to the territories of both [[human]]ity and the [[Covenant]].{{Ref/Reuse|warfleet}}

==History==
===Ancient history===
Most of the Orion Arm was under the control of the ecumene until the massive [[Forerunner-Flood war]]. The [[Flood]] absorbed numerous planetary systems in the Orion Arm. Following the [[Great Purification|activation]] of the [[Halo Array]] in [[97,445 BCE]], the surviving Forerunners left the Orion Arm<ref>''[[Halo Encyclopedia (2009 edition)]]'', p. 28</ref> as well as the Milky Way galaxy itself.<ref>''[[Halo: Fractures]]'', "[[Untitled story (Halo: Fractures)|Coda]]"</ref> 

===Formation of the Covenant===
As the Covenant continued to grow, Covenant colonies continued to spread across the Orion Arm.<ref>''Halo Encyclopedia: The Definitive Guide to the Halo Universe'', p. 119</ref>

===Rise of Humanity===
During the [[Human-Covenant War]], [[Insurrectionist]]s and other independent human forces began creating settlements on planets on the Sagittarius side of the Orion Arm. These settlements were not sanctioned by the UNSC.<ref>''[[Halo: Evolutions - Essential Tales of the Halo Universe]]'', "[[The Impossible Life and the Possible Death of Preston J. Cole]]", p. 340</ref> 

===Created crisis===
{{Main|Created conflict}}
On [[2558#October|October 28, 2558]],{{Ref/Site|D=01|M=6|Y=2020|URL=https://www.halowaypoint.com/en-us/universe/characters/linda-058|SiteName=Halo Waypoint|PageName=Universe - Linda-058}} [[Cortana]], the leader of the [[Created]] sent an [[The Reclamation|ultimatum]].{{Ref/Level|H5G|Level=Guardians}} After which, she unleashed her [[Guardian Custode]]s on the species, civilizations, governments, and organizations on the Orion Arm.{{Ref/Novel|Novel=Halo: Shadows of Reach|Chapter=1}}

==Astrography==
The [[Orion complex]], the center of the [[Forerunner]] [[ecumene]] and the location of their homeworld [[Ghibalb]], was located in the Orion Arm.<ref>''[[Halo: Cryptum]]'', p. 222</ref> The homeworlds and colonies of the former client species of the [[Covenant]] are also found in the Orion Arm.{{Ref/Reuse|warfleet}}

The [[Sol system]], [[Earth]] and [[Human colonies|humanity's colonial space]] are within the Orion Arm.

==Gallery==
<gallery>
File:Milky-Way-labeled.jpg|The location of the Orion Arm, labeled here as the Orion Spur, in the Milky Way galaxy.
</gallery>

==Sources==
{{Ref/Sources}}

[[Category:Astronomy]]