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| {{Status|Canon}} | | {{era|Forerunner|Covenant|Human|UNSC|HCW|Post}} |
| {{Wikipedia}} | | {{Ratings}} |
| [[File:Halo Starscope - Orion Arm.jpg|thumb|250px|A view of the Orion Arm.]] | | {{seeWikipedia}} |
| | [[File:Orion Arm.png|thumb|In this diagram, the '''Orion Arm''' is labeled "Local Spur". The position of the Solar System is indicated by the yellow dot.]] |
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| 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}} | | The '''Orion Arm''' is a spiral escalation of a minor spiral arm in the [[Milky Way]] galaxy. It is located near the galactic core and is part of the Sagittarius Arm (a major arm). It is also referred to as the Local Arm, Local Spur, or the Orion Spur. It is named "Orion" due to its proximity to the [[Wikipedia:Orion (constellation)|Orion constellation]].<ref>[[Wikipedia:Orion Arm|'''Orion Arm''' on Wikipedia]]</ref> |
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| ==History==
| | The [[Solar System]] and [[Earth]] are within and amid the Orion Arm. By [[2490]], [[UNSC]] colonial space encompassed over 800 planets and colonies ranging from small outposts to large, important military strongholds in the Orion Arm.<ref>[http://halostory.bungie.org/halostory.timeline.html '''Halo.Bungie.org''': ''Halo Story Page - Halo Story Timeline'']</ref> The [[Covenant]]'s area of inhabitants also includes a large portion of the Orion Arm. The [[Orion complex]], the center of the [[Forerunner]] [[ecumene]] and the location of their homeworld [[Ghibalb]], was also located in the Arm.<ref>'''[[Halo: Cryptum]]''', ''page 222''</ref> |
| ===Ancient history===
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| 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>
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| ===Formation of the Covenant===
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| 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>
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| ===Rise of Humanity===
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| 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>
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| ===Created crisis===
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| {{Main|Created conflict}}
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| 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|Site=Halo Waypoint|Page=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}}
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| ==Astrography==
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| 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}} | |
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| The [[Sol system]], [[Earth]] and [[Human colonies|humanity's colonial space]] are within the Orion Arm.
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| ==Gallery==
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| <gallery>
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| File:Milky-Way-labeled.jpg|The location of the Orion Arm, labeled here as the Orion Spur, in the Milky Way galaxy.
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| </gallery>
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| ==Sources== | | ==Sources== |
| {{Ref/Sources}}
| | <references/> |
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| | ==Related links== |
| | *[[:Category:Planetary Systems|Planetary systems]] |
| | *[[Milky Way]] |
| | *[[Sol System]] |
| [[Category:Astronomy]] | | [[Category:Astronomy]] |
