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{{Status|Canon}}
{{era|H1|H2|H3|HW|H3R|FOR|TF|FS|GOO|CH|UP|HGN|ILB|TCP|RE|}}
{{Wikipedia}}
{{ratings}}
[[File:Milky Way 2.jpg|thumb|The Milky Way as seen from [[Installation 00|the Ark]].]]
{{SeeWikipedia|Milky Way}}
The '''Milky Way''', known as '''Path Tolgreth''' to the [[Forerunner]]s,{{Ref/Novel|Id=HPoL24|HPoL|Chapter=24}} is a [[wikipedia:Barred spiral galaxy|barred spiral galaxy]].{{Ref/Reuse|YTAccurate}}{{Ref|See the [[#Production notes|production notes]] section}}  


It is the galaxy where [[human]]ity and the former [[Covenant]] client species reside,{{Ref/Novel|[[Halo: Contact Harvest]]|Page=26}} “The Covenant, as an empire, dominated much of the galaxy, though they would generally leave a world untouched unless it offered particular treasures, whether practical or religious”. The UNSC, however, is largely limited to the [[Orion Arm]] of the Milky Way.<ref name="Warfleet">''[[Halo: Warfleet]]'', p. 12-13</ref> The galaxy is also home to a number of other intelligent species, although only a small number of these have attained spacefaring or even technological status.{{Ref/Site|Id=bulkhead banter|D=01|M=6|Y=2020|URL=https://www.halowaypoint.com/en-us/news/canon-fodder-bulkhead-banter|Site=Halo Waypoint|Page=Canon Fodder - Bulkhead Banter}} In total, the galaxy was home to quadrillions.{{Ref/Novel|Halo: Divine Wind|Chapter=1}}
[[Image:Milky Way.jpg|thumb|The Milky Way seen in infrared from Earth.]]


==Overview==
[[Image:Ssc2008-10a.jpg|thumb|An overhead view of the Milky Way.]]
[[File:HWF - Full Galaxy map.jpg|thumb|A map of the Milky Way galaxy.{{Ref/Book|Halo: Warfleet – An Illustrated Guide to the Spacecraft of Halo}}]]
From outside, the Milky Way is a vaguely disk shaped galaxy with a bright center.{{Ref/Reuse|arklevel}} From inside however, the galaxy appears to be a clouded, bulbous band.{{Ref/Map|Halo 3|[[Orbital]]}}


It is orbited by two small satellite galaxies known as the [[Magellanic Clouds]].{{Ref/Novel|Id=clouds|[[Halo: Cryptum]]|Page=268}}
The '''Milky Way''' is the [[wikipedia:galaxy|galaxy]] where the [[human]]s and the [[Covenant]] reside,<ref>''[[Halo: Contact Harvest]]'', page 26</ref> and is approximately 100,000 light years in diameter. It is a [[wikipedia:Barred spiral galaxy|barred spiral galaxy]] that lies within the [[wikipedia:Local group|local group]] of galaxies neighborhood, which is just a very small portion of the universe. Visible from [[Earth]] as a band of light in the night sky, the Milky Way is just one of many galaxies in the observable universe, though the Milky Way has special significance to Humanity as it is the home galaxy of the planet, Earth.


===Locations===
==Orion Arm==
*[[Sagittarius Arm]]
The Orion Arm is the origin for [[human|humanity]] and their home planet Earth, with at least 800 worlds colonized by the [[UNSC]] at one point. It is also the area of origin for the various races of the [[Covenant]], with possibly even more worlds. It is assumed to be the place of origin for the [[Forerunners]] as well, but their mysterious nature and advanced technology means that it is not known exactly where they came from, if they expanded further out through the galaxy, or even if they originated from outside of this galaxy.
**[[Ephsu system]]
 
*[[Kerrec Irruption]]
The Orion Arm is the setting for the [[Human-Covenant War]] of the 26th Century and the far more ancient [[Forerunner-Flood War]], witnessing at least two massive wars. It is also the home of at least two [[Halo|Halo Installations]] and the teleporter to the [[Ark]] or Installation 00.
*[[IX-KA anomaly]]
*[[Rhotero]]
*[[Invicta]]
*[[Jad Sappar]]
*[[Greater Tiger]]
*[[Seclusion]]
*[[Norma Arm]]
**[[Coelest system]]
*[[Orion Arm]]
**[[Human colonies]] {{C|[[Prehistoric human civilization#Sphere of influence|prehistoric humans]]}}
**[[Covenant#Known Covenant worlds|Covenant systems and worlds]]
***[[Sangheili colonies]]
**[[Ecumene#Known regions, systems and worlds|Forerunner systems and worlds]]
*[[Scutum-Centaurus Arm]]
**[[Khaphrae system]]
*[[Cygnus Arm]]
**[[Korinth Prior system]]


==History==
==History==
===Prehistory===
===Forerunner-Flood War===
100,000 years before the present day, the previous galactic community was dominated by the [[Forerunner]]s, a now [[extinction|extinct]] species that possessed extremely advanced technology and [[Ecumene|an empire]] that spanned a significant portion of the galaxy. Millions of years before the rise of the Forerunners, an even more advanced civilization known as the [[Precursor]]s controlled the Milky Way. Having reached the pinnacle of [[Technological Achievement Tiers|technological advancement]], they were believed to have significantly contributed to the evolution of life across the galaxy, even created several species, such as Forerunners and humans. Over ten million years before the present, however, the Forerunners [[Forerunner-Precursor war|rose up against]] their creators in defiance of their decision to bestow their [[Mantle]] on humanity,{{Ref/Novel|Id=primordium|[[Halo: Primordium]]}} and seemingly ended their rule in the galaxy after destroying their last remnants in the [[Large Magellanic Cloud]].{{Ref/Novel|Halo: Silentium|Page=181-182}}


The Forerunners, originating from [[Ghibalb]] in the [[Orion complex]], ruled a large portion of the galaxy for millions of years, affecting the development of other species as they saw fit. Around [[150,000 BCE]], [[human]]ity, still composed of many species, arose from their homeworld Earth, known as "Erde-Tyrene" at the time. They mastered interstellar travel and began to move [[Prehistoric human civilization|their civilization]] along the Orion Arm of the Milky Way. They later [[Human-San'Shyuum alliance|allied]] with the [[San'Shyuum]] species, forming a prosperous interstellar empire based on the [[planet]] [[Charum Hakkor]]. Around [[107,445 BCE]], humanity and their San'Shyuum allies came into contact with the Flood, a sentient parasite supposedly originating from the [[Large Magellanic Cloud]].{{Ref/Reuse|clouds}} Hundreds of systems were lost to the parasite in the [[Human-Flood war|resulting conflict]]. Meanwhile, humanity's aggressive expansion and the perceived violations of the [[Mantle]] prompted the Forerunners to take action and begin [[human-Forerunner wars|a war]] against humanity. Although the Flood later withdrew and seemingly died out from the galaxy, it had already weakened the humans enough to allow the Forerunners to emerge victorious.{{Ref/Novel|Id=cryptum|[[Halo: Cryptum]]}}
{{Main|Forerunner-Flood War}}


Following the war in approximately [[106,445 BCE]], the Forerunners dismantled humanity's civilization, regressing them into a [[Technological Achievement Tiers|Tier 7 species]]. The remaining humans were devolved and exiled to their homeworld, where they slowly began to redevelop [[Erde-Tyrene civilization|a primitive civilization]] under the tutelage of the Forerunner [[Lifeshaper]], the [[Librarian]].{{Ref/Reuse|cryptum}}
[[Image:Halo-7-coverage.jpg|200px|right|thumb|Optimal projection of the area covered by [[The Halo Array|the Halo Array]].]]


===Activation of the Halo Array===
Prior to approximately the year 97,448 B.C. (human years), the previous galactic community was dominated by the [[Forerunners]], a mysterious and now extinct species that possessed extremely advanced technology and an empire that spanned a significant portion of the galaxy. However, encounters with a parasitic sentient species, the [[Flood]], led to the [[Forerunner-Flood War]], with the Flood consuming or killing the great majority of the galaxy's sentient species as the Forerunners first studied them, and then tried to stop them. Eventually, the Forerunners were forced to construct the ultimate weapon, the [[Halo Array]], in order to stop them - at the same time, killing its builders. The Forerunners built safe havens, including the [[Shield World]]s and the [[Installation 00|Ark]], to save the remaining sentient species, before activating it, scouring the galaxy of all sentient life forms and killing the Flood except for samples kept on the [[Halos]], then releasing the saved species from their havens to their home worlds.
{{Main|Forerunner-Flood war}}


10,000 years after humanity's conflict with the Flood, the parasite resurfaced and attacked worlds of the Forerunners' domain. Encounters with the Flood led to the [[Forerunner-Flood war]], with the Flood consuming or killing the great majority of the galaxy's sentient species as the Forerunners first studied them, and then tried to stop them. Eventually, the Forerunners were forced to activate the ultimate weapon, the [[Halo Array]], in order to stop them - at the same time, killing its builders. The Forerunners built safe havens, including the [[Shield World]]s and [[Installation 00|the Ark]], to save the remaining sentient species in plan known as the [[Conservation Measure]], before [[Great Purification|activating the Array]], scouring the galaxy of all sentient life forms and killing the Flood except for samples kept on the Halos, then [[reintroduction|releasing]] the saved species from their havens to their home worlds.
===Human-Covenant War===


===Galactic recovery===
{{Main|Human-Covenant War}}
{{Main|Dark time}}
Almost 100,000 years afterward, the galaxy had recovered substantially, leading to the rise of two great civilizations; the [[UNSC]], comprised of the majority of humanity and controlled from [[Earth]], and the [[Covenant]], a hegemony of many different species who worshiped the Forerunners as gods. Contact between the UNSC and Covenant was not peaceful, leading to the [[Human-Covenant War]], which destroyed hundreds of human colonies and killed billions of colonists and UNSC military personnel, since the Covenant possessed more advanced technology, mostly reverse-engineered from Forerunner artifacts.


The discovery of one of the Forerunners Halo installations set forth a series of events that would not only end the war, but also destroy the Covenant and begin a Covenant civil war, or [[Great Schism]]. Triggered by the replacement of the [[Sangheili]] with the [[Jiralhanae]] in the Covenant military hierarchy, the Sangheili left the Covenant, in the process that consumed a significant amount of the Covenant's populace and resources. A [[Fleet of Retribution|major breakaway faction]] led by [[Arbiter]] [[Thel 'Vadam]], realizing that the [[Prophets]] were conducting an unjustified war against humanity and planning a misguided activation of the [[Halo Array]], allied with the UNSC to stop them, leading to the destruction of the Covenant in the [[Battle of Installation 00]].
Almost 100,000 years afterward, the galaxy had recovered substantially, leading to the rise of two great civilizations the [[UNSC]], comprised of the majority of humanity and controlled from [[Earth]], and the [[Covenant]], a hegemony of many different species who worshiped the [[Forerunners]] as gods. Contact between the UNSC and Covenant was not peaceful, leading to the [[Human-Covenant War]], which destroyed hundreds of human colonies and killed billions of colonists and UNSC military personnel, since the Covenant had more advanced weaponry. The discovery of one of the Forerunners Halo installations set forth a series of events that would not only end the war, but also destroy the Covenant and begin the Covenant Civil War, or [[Great Schism]].


===Post-war===
===Great Schism===
[[File:H5G-Lasky&Roland.jpg|thumb|250px|[[Roland]] and [[Thomas Lasky|Lasky]] examining the takeover of multiple systems by the [[Created]].{{Ref/Reuse|guardianslevel}}]]
Following the end of the Human-Covenant War, humanity began a long process of rebuilding, while elements within the [[Office of Naval Intelligence]] sought to ensure their former enemies - mainly the Sangheili - would not rise again. Meanwhile, humanity gained significant advances in technology due to the discovery of Forerunner artifacts during and after the war.


Though the civilization of the Sangheili had plunged into chaos due to the [[Covenant remnants|breaking of the Covenant]],{{Ref/Novel|Id=glass|Halo: Glasslands}} the conflict between them and the Jiralhanae would still rage by [[2559]]. Humanity, as well, would continue to face conflict both within and without, in the form of resurgent [[Insurrectionist]] movements as well as various hostile [[Covenant remnants]]. [[Post-Covenant War conflicts|These irregular conflicts]] later saw significant Forerunner involvement, both in terms of contention for Forerunner artifacts but also the reawakening of the Forerunner commander known as the [[Ur-Didact]] and his [[Promethean]] armies on [[Requiem]].
{{Main|Great Schism}}


Months after the Didact's release, [[Cortana]], a human [[artificial intelligence]] who played a key role in the waning years of the Human-Covenant War, staged an AI [[Created|rebellion]] against the galaxy's organic species using a legion of Promethean warriors and a caste of Forerunner constructs known as [[Guardian Custode]]s. Using the latter, Cortana disabled most contemporary technologies across hundreds of colonies across the [[Orion Arm]], both human and alien, bringing the species under her aegis on pain of death.{{Ref/Level|Id=guardianslevel|Halo 5: Guardians|[[Guardians]]}}
Triggered by the replacement of the [[Elite]]s with the [[Brute]]s, the Elites left the Covenant, in the process that consumed a significant amount of the Covenant's populace and resources, creating the [[Covenant Separatists|Separatist]] faction. The Separatists, realizing that the [[Prophets]] were conducting an unjustified war against humanity and planning a misguided activation of the [[Halo Array]], allied with the UNSC to stop them, leading to the [[Battle of Installation 00]]. Here the Separatists crushed the remainder of the [[Covenant Loyalists]] and ended the war.


==Exploration==
==Exploration==
[[File:Halo Star Map V2.png|300px|A near-accurate star map based off information from the novels.|thumb]]
===UNSC===
===UNSC===
{{Main|Human colonies}}
The development of the [[Shaw-Fujikawa Translight Engine]] in [[2291]] allowed humanity to leave the confines of its home star system for the first time and explore Earth's interstellar neighborhood, ushering in an age of rapid colonization and expansion. The first line of colony ships were unveiled in [[2310]], and over the next 28 years, the UNSC began [[terraforming]] and colonizing more than 210 worlds, which would become the [[Inner Colonies]]. Colonial expansion continued and by [[2490]], UNSC colonial space encompassed over 800 worlds, large and small, in the [[Orion Arm]]. The success of colonization of the [[Outer Colonies]] made the Inner Colonies the primary stronghold, both military and economic, though they relied heavily on raw materials supplied by the Outer Colonies. At the end of the [[Domus Diaspora|Golden Age of human expansion]] in the twilight of the 25th century, tensions between the Inner and Outer colonies culminated in hundreds of civil wars waged across the Outer Colonies, collectively termed as the [[Insurrection]].


In [[2525]], humanity made contact with the genocidal alien hegemony known as the [[Covenant]], bent on humanity's destruction. During the 27 years of conflict, hundreds of human colonies were destroyed and billions of civilians and military personnel were killed by the Covenant.
{{Main|UNSC}}
 
====Solar System====
The colonization of the Milky Way includes the early colonization attempts of the [[United Nations]] and the UNSC, beginning with the colonization of the Solar System during the 2100's. The first planet believed to be colonized is [[Mars]], followed by the [[Jovian Moons]]. During [[2160]] - [[2164]], the Solar System was the site of the [[Interplanetary War]], the most brutal conflict known to man since World War II. The war was fought between the UN naval and infantry forces, the Neo-[[Communism|Communist]] [[Koslovics]] (led by hardliner [[Vladimir Koslov]]), and the [[Frieden]] rebels ([[Jovian Moons|Jovian]] secessionists). Following the successful [[Marine]] deployments on [[Mars]] during the [[Argyre Planitia Campaign]] of [[2163]], the U.N. ultimately defeated both Koslovic and Frieden rebels throughout the Solar System, thus forming the United Nations Space Command.
 
====Beyond====
The development of the [[Shaw-Fujikawa Translight Engine]] in 2291 allowed humanity to leave the confines of its home star system for the first time and explore the wider galaxy, ushering in an age of rapid colonization and expansion. The first line of colony ships were unveiled in [[2310]], and on January 1st, [[2362]], the ''[[Odyssey]]'', the first colony ship capable of faster-than-light travel, was launched laden with troops and terraforming gear. Over the next 28 years, the UNSC began terraforming and colonizing more than 210 worlds, which would become the Inner Colonies.
 
Colonial expansion continued and by [[2490]], UNSC colonial space encompassed over 800 worlds, large and small, in the [[Orion Arm]]. The success of colonization of the [[Outer Colonies]] made the Inner Colonies the primary stronghold, both military and economic, though they relied heavily on raw materials supplied by the Outer Colonies. During this period, the planet [[Reach]] (orbiting [[Epsilon Eridani]], right on Earth's metaphorical doorstep) became the UNSC's primary naval yard and training academy. Reach was a major producer of warships and colony vessels, as well as a training ground for covert operatives and Special Forces.
 
On April 20, [[2525]], contact with the Outer Colony, [[Harvest]], was lost. After failing to re-establish contact with Harvest, the [[Colonial Military Administration]] sent a scout ship, the ''[[Argo]]'', to investigate. Contact with the Argo was subsequently lost after the ship arrived in the Harvest system, plunging humanity into a deadly war with an alien race known as the "[[Covenant]]". Harvest was glassed from orbit, and marked the beginning of the war with the Covenant. The war was termed the [[Human-Covenant War]], and was the most destructive conflict in the galaxy's history since the [[Forerunner-Flood War]] 100,000 year prior. Since the war's beginning, hundreds of human colonies have been destroyed and billions of civilian and military personnel have been killed by the Covenant.
 
At its peak, the UNSC encompassed a number of star systems, with hundreds of planets, moons and planetoids settled by colonists, some terraformed to greater degrees than others depending on the local conditions and presence of indigenous life. The Inner Colonies encompassed a region of space in at least a 10.5 light-year three-dimensional radius from Earth. Beyond that were the Outer Colonies. In 2456, Harvest was the furthest Outer Colony at 11.83 light-years from the other colonies. Other colonies were established even further - [[Onyx]] in the [[Zeta Doradus]] system, at 38 light-years<ref>''[[Halo: Ghosts of Onyx]]''</ref>; [[Coral]], at 42 light-years<ref>''[[I Love Bees]]''</ref>; and [[23 Librae]], which lay 83.7 light-years from Earth.<ref>''[[Halo: The Cole Protocol]]''</ref>, [[Sigma Octanus]] at 270 light-years,<ref name="Reach">''[[Halo: The Fall of Reach]]''</ref> and [[Beta Centauri]], at 525 light-years from Earth, the furthest ''known'' human-occupied star system.<ref name="Reach"/> It is unknown how many colonies remain at the end of the war in 2553, although remarks made by [[Lord Hood]] suggested that UNSC territory has been reduced to Sol, and a mere handful of Inner Colonies.


===Covenant===
===Covenant===
{{Main|Covenant|Sangheili colonies}}
[[File:H5G - Milky Way.png|thumb|left|250px|A Covenant hologram of the Milky Way aboard ''[[Undiminished Entelechy]]''.]]
Because the Covenant have been spacefaring for over three millennia,{{Ref/Book|[[Halo Encyclopedia (2009 edition)]]|Page=30}} and possess far superior [[astrogation|slipstream navigation]] technology to humanity, they have explored a significantly larger portion of the galaxy than humanity has. Encompassing thousands of systems, the Covenant Empire was so expansive and complex that entire worlds and sub-domains could disappear from records for decades before contact resumed.{{Ref/Book|HWF|Page=52}} The Covenant dominated much of the galaxy but would leave a world untouched unless it had religious or practical importance.{{Ref/Site|URL=https://www.halowaypoint.com/en-us/universe/factions/covenant|Site=Halo Waypoint|Page=Covenant|D=25|M=01|Y=2016}} The Covenant have discovered and explored several Forerunner [[shield world]]s as well as other Forerunner artifacts, from which they have acquired much of their advanced technology.


The [[Human-Covenant War]] has devastated numerous human worlds, but at least two Covenant worlds, [[Joyous Exultation]] and [[Glyke]], were devastated by UNSC [[NOVA bomb]]s. Earlier on, both [[Taming of the Hunters|Te]] and [[Unggoy Rebellion|Balaho]], the Lekgolo and Unggoy homeworlds respectively, were almost [[glassing|glassed]] during the [[Covenant]]'s history.
{{Main|Covenant}}
{{Clear}}


===Forerunner===
Because the [[Covenant]] have been space-faring for at least a thousand years<ref>[[Bestiarum]]</ref>, and possess far superior slipstream navigation technology to humanity, they have explored a significantly larger portion of the galaxy than [[humanity]] has. Based primarily in the [[Orion Arm]] of the Milky Way, it is unknown if they maintain territories outside of the region, but there are several homeworlds and colonies located in the Orion Arm. Additionally, the Covenant have discovered and explored several Forerunner Shield Worlds, similar to [[Shield World (Halo Wars)|one destroyed by human forces]], from which they have acquired much of their advanced technology. Exactly how many of these worlds they have found, and their status, is unknown.
{{Main|Forerunner}}
The Forerunners, having been spacefaring for millions of years and possessing slipspace technology allowing them to cross galactic distances in a negligible time, had explored significant portions of the galaxy. Their [[ecumene]] encompassed three million fertile worlds,{{Ref/Novel|Halo: Cryptum|Page=9}} along with many artificial installations they had constructed. The Forerunners divided the galaxy into [[margin arc]]s and [[thema]]s, with the latter being defined by galactic-scale magnetic fields.{{Ref/Novel|Halo: Silentium|Page=234-235}} They were also capable of traveling [[intergalactic space|outside the galaxy]], including an expedition to the [[Path Kethona|Large Magellanic Cloud]] and the construction of the [[Ark]]s hundreds of thousands of lightyears from the galaxy.{{Ref/Level|Id=arklevel|Halo 3|[[The Ark]]}}


==Production notes==
The [[Human-Covenant War]] has devastated numerous human worlds, but at least one [[Covenant]] world, [[Joyous Exultation]], was devastated by [[Admiral Whitcomb]]'s [[NOVA Bomb]] in retribution for the destruction of [[Reach]]. It is unknown if the Separatists and Loyalists destroyed worlds under the control of the other faction, but both [[Taming of the Hunters|Te]] and [[Unggoy Rebellion|Balaho]], the Lekgolo and Unggoy homeworlds respectively, were almost [[glassed]] during the [[Covenant]]'s history.
[[File:RW_SpitzerMilkyWay.jpg|thumb|The real-world NASA image from which the ''Halo 3'' Milky Way texture was based upon.{{Ref/Site|URL=http://www.spitzer.caltech.edu/Media/mediaimages/sig/sig05-010.shtml|Site=NASA|Page=Milky Way Bar|D=19|M=7|Y=2006}}]]
The Milky Way as seen in ''Halo 3'' and the cover art for ''[[Halo: Hunters in the Dark]]'' is depicted as a [[Wikipedia:Barred_spiral_galaxy|barred spiral galaxy]]. This is an accurate depiction of the Milky Way, with the knowledge available to [[Bungie]] during the game's development. To create the texture used to represent the Milky Way, Bungie used the then-latest data available; an artist's impression of the Milky Way produced by NASA in [[2005 (real world)|2005]] based on observations from the [[Wikipedia:Spitzer Space Telescope|Spitzer Space Telescope]].{{Ref/YouTube|Id=YTAccurate|ikSUgaG_zIA|Dr. Ryan Ridden|Is the Galaxy in Halo 3 Scientifically Accurate?|D=02|M=3|Y=2021}}{{Ref/Twitter|RyanRidden|1336005452048592909|Ryan Ridden|Quote=Hey @game_fabricator was the Milky Way we see in Halo 3 based on the NASA illustration for the Spitzer discovery of the Milky Way Bar?|D=02|M=3|Y=2021}}{{Ref/Twitter|game_fabricator|1336018120188678145|Marcus Lehto|Quote=Yes it was!|D=02|M=3|Y=2021}}


==Trivia==
==Locations==
{{Linkbox|gallery=yes|gallerypage=Images of the Milky Way}}
 
*There are four engagements or conflicts known to have taken place outside the Milky Way in modern times. They are the [[Battle of Installation 00]], [[Operation: FAR STORM]], [[Attack on Installation 00]] and [[Second Ark Conflict]]. Two other cases of extragalactic conflict are known to have occurred in the distant past; the [[Battle of the greater Ark]] in the final days of the [[Forerunner-Flood war]] and the later stages of the [[Forerunner-Precursor war]] over ten million years earlier.
[[Image:Orion_Arm.png|thumb|200px|The known Milky Way galaxy. The yellow dot represents the Solar System and the Orion Arm is labeled "Local Spur".]]
*The Milky Way can be seen from [[Installation 00|the Ark]].
*The view of the Milky Way, as seen from the Ark in ''[[Halo 3]]'' and other "modern" ''Halo'' media, is a view of the galaxy as it existed 262,144 years ago - prior to the [[Great Purification|firing]] of the [[Halo Array]] and many of the events of the [[Distant past|later Forerunner era]].


==Gallery==
*[[wikipedia:Perseus Arm|'''Perseus Arm''']]
<gallery>
*[[wikipedia:Cygnus Arm|'''Norma and Cygnus Arm''']]
File:Galaxy map.jpg|The Milky Way as seen on [[Halo2.com]].
*[[wikipedia:Scutum-Crux Arm|'''Scutum-Crux Arm''']]
File:H3_Orbital_Galaxy.jpg|A view of the galaxy, as seen on the ''[[Halo 3]]'' map [[Orbital]].
*[[wikipedia:Sagittarius Arm|'''Sagittarius Arm''']]
File:Hunters_in_the_Dark_full_cover.jpg|The Milky Way as viewed on the cover art for ''Halo: Hunters in the Dark''. Befitting of the novel's setting of the Ark, the cover reuses the ''Halo 3'' Milky Way texture to depict the galaxy.
File:HWF - Galaxy map combined.jpg|A high-resolution copy of the ''Halo: Warfleet'' Milky Way artwork, not including the bottom portion.
</gallery>


==List of appearances==
===[[Orion Arm]]===
The Milky Way, and the [[Orion Arm]] in particular, has a large number of inhabited or, at least, habitable, planets within it, with the '''[[United Earth Government]]''' and the '''[[Covenant|Covenant Empire]]''' both maintaining distinct territories of their own. Other planets and systems were once home to the now-extinct '''[[Forerunners]]''', whose interstellar empire spanned the galaxy until their disappearance.
{{col-begin}}
{{col-begin}}
{{col-2}}
{{col-2}}
*''[[Halo: The Fall of Reach]] {{1st}}
 
**''[[Halo: The Fall of Reach#2010 bonus content|Adjunct]]''
====UNSC====
*''[[Halo: Combat Evolved]]''
=====Systems=====
*''[[Halo: The Flood]]''
'''Human Systems'''
**''[[Halo: The Flood#2010 bonus content|Adjunct]]''
*[[23 Librae|23 Librae System]]
*''[[Halo: First Strike]]''
**[[Madrigal]]
**''[[Halo: First Strike#2010 bonus content|Adjunct]]''
**[[Hesiod]]
**''[[Petra]]''
**[[The Rubble]]
**''[[Tug o' War]]''
*[[111 Tauri System]]
*''[[i love bees]]''
**[[Victoria]]
*''[[Halo 2]]''
*[[Alpha Aurigae System]]
**''[[Conversations from the Universe]]''
**[[Origami Asteroid Field]]
*''[[Halo Graphic Novel]]''
*[[Beta Centauri|Beta Centauri System]]
**''[[Armor Testing]]''
*[[Charybdis System]]
**''[[Breaking Quarantine]]''
**[[Charybdis IX]]
**''[[Halo Graphic Novel, Page 122|Page 122]]''
*[[Chi Ceti System]]
**''[[Second Sunrise Over New Mombasa]]''
**[[Chi Ceti IV]]
**''[[The Last Voyage of the Infinite Succor]]''
*[[Cygnus System]]
*''[[Halo: Ghosts of Onyx]]''
**[[New Jerusalem]]
*''[[Starry Night]]''
*[[Ectanus 45|Ectanus 45 System]]
*''[[Iris]]''
**[[Chi Rho]]
**''[[Halo 3: The Cradle of Life]]''
*[[Epsilon Eridani System]]
*''[[Believe]]''
**[[Reach]]
**''[[Believe: The John 117 Monument]]''
**[[Tribute]]
**''[[Diorama]]''
**[[Circumstance]]
**''[[Enemy Weapon]]''
**[[Beta Gabriel]]
**''[[Gravesite]]''
*[[Eridanus System]]
**''[[Hunted]]''
**[[Eridanus II]]
**''[[Museum]]''
**[[Eridanus Secundus]]
*''[[Halo: Landfall]]''
*[[Epsilon Indi System]]
**''[[Halo: Arms Race]]''
**[[Harvest]]
**''[[Halo: Combat]]''
*[[Groombridge 34 System]]
**''[[Halo: Last One Standing]]''
*[[Groombridge-1830|Groombridge-1830 System]]
*''[[Halo: Uprising]]''
*[[Hellespont System]]
*''[[Halo 3]]''
**[[Troy]]
**''[[Bestiarum]]''
*[[Hydra System]]
**''[[Terminal (Halo 3)|Terminals]]''
*[[Lambda Serpentis System]]
*''[[Halo: Contact Harvest]]''
**[[Jericho VII]]
*''[[Halo: The Cole Protocol]]''
*[[Paris System]]
*''[[Halo Wars: Genesis]]''
**[[Paris IV]]
*''[[Halo Wars]]''
*[[Procyon]] system
*''[[Halo: Helljumper]]''
**[[Arcadia]]
*''[[The Life]]''
*[[Sigma Octanus System]]
*''[[Halo 3: ODST Pre-mission Evaluation]]''
**[[Sigma Octanus IV]]
*''[[Halo 3: ODST]]''
*[[Sol System]]
**''[[Sadie's Story]]''
**[[Earth]]
*''[[Halo Legends]]''
**[[Mars]]
**''[[Homecoming]]''
**[[Jovian Moons]]
**''[[Odd One Out]]'' {{C|Non-canonical appearance}}
*[[XI Boötis A System]]
**''[[Origins]]''
*[[Zeta Doradus System]]
**''[[Prototype]]''
**[[Onyx]]
**''[[The Babysitter]]''
 
**''[[The Duel]]''
=====Colonies From Unknown Systems=====
**''[[The Package (animated short)|The Package]]''
*[[Ballast]]
*''[[Halo: Evolutions]]''
*[[Biko]]
**''[[Blunt Instruments]]''
*[[Coral]]
**''[[Dirt]]''
*[[Draco III]]
**''[[From the Office of Dr. William Arthur Iqbal]]''
*[[Emerald Cove]]
**''[[Headhunters (short story)|Headhunters]]''
*[[Far Isle]]
**''[[Human Weakness]]''
*[[Gilgamesh]]
**''[[Midnight in the Heart of Midlothian]]
*[[Harmony]]
**''[[Palace Hotel]]''
*[[Mariposa]]
**''[[Pariah]]''
*[[Minister]]
**''[[Soma the Painter]]''
*[[Miridem]]
**''[[Stomping on the Heels of a Fuss]]''
*[[New Harmony]]
**''[[The Impossible Life and the Possible Death of Preston J. Cole]]''
*[[Tantalus]]
**''[[The Mona Lisa]]''
**''[[The Return]]''
**''[[Wages of Sin]]''
{{col-2}}
{{col-2}}
*''[[Halo: Blood Line]]''
 
*''[[Remember Reach]]''
====Covenant====
**''[[Birth of a Spartan]]''
=====Systems=====
**''[[Patrol]]''
*[[Tala System]]
**''[[Spaceport (Remember Reach)|Spaceport]]
**[[Balaho]]
**''[[New Life]]''
*[[Oth Sonin System]]
**''[[Deliver Hope]]''
**[[Doisac]]
*''[[Halo: Reach]]''
*[[Y'Deio System]]
**''[[Data pads]]''
**[[Eayn]]
**''[[Dr. Halsey's personal journal]]''
*[[Napret System]]
*''[[Halo: Fall of Reach]]''
**[[Palamok]]
**''[[Halo: Fall of Reach - Boot Camp|Boot Camp]]''
*[[Svir System]]
**''[[Halo: Fall of Reach - Covenant|Covenant]]''
**[[Te]]
**''[[Halo: Fall of Reach - Invasion|Invasion]]''
*[[Urs System]]
*''[[Halo: Cryptum]]''
**[[Sanghelios]]
*''[[Halo: Glasslands]]''
*[[Tau Ceti System]]
*''[[Halo Living Monument]]''
*[[51 Pegasi]] System
*''[[Halo: Combat Evolved Anniversary]]''
**[[51 Pegasi-B System]]
**''[[Terminal (Halo: Combat Evolved Anniversary)|Terminals]]''
***[[Pegasi Delta]]
*''[[Halo: Primordium]]''
*[[Hawking System]]
*''[[The Commissioning]]''
*[[Lambda Serpentis System]]
*''[[Halo: The Thursday War]]''
*[[Salia System]]
*''[[Halo 4: Forward Unto Dawn]]''
**[[Joyous Exultation]]
*''[[Section 3 ARG]]''
*[[23 Librae]]
*''[[Scanned]]'' {{C|Partial Non-canonical appearance}}
**[[Metisette]]
*''[[Halo 4]]''
 
**''[[Terminal (Halo 4)|Terminals]]''
=====Colonies in Unknown Systems=====
**''[[Spartan Ops]]''
*[[Decided Heart]]
**''[[Infinity Briefing Packet]]''
*[[Weeping Shadows of Sorrow]]
*''[[Halo: Silentium]]''
 
*''[[Rebirth]]''
====Forerunner/Flood Planets====
*''[[Halo: Spartan Assault]]''
*[[DM-3-1123]]
*''[[Halo: Initiation]]''
*[[LP 656-38]]
*''[[Halo: Escalation]]''
*[[CE-10-2164-d]]
*''[[Halo: Mortal Dictata]]''
*[[Substance]]
*''[[Halo: Broken Circle]]''
*[[Threshold]]
*''[[Halo: Nightfall]]''
*[[Iris Nebula]]
*''[[Halo 2 Anniversary]]''
*[[Onyx|Onyx Shield World]]
**''[[Terminal_(Halo_2:_Anniversary)|Terminals]]''
*[[Shield World (Halo Wars)|Unknown Shield World]]
*''[[Halo: New Blood]]''
**''[[Halo: New Blood#2016 bonus content|Coda]]''
*''[[Hunt the Truth]]''
**''[[All Hail]]''
**''[[The Cost]]''
**''[[Hunt the Signal]]''
**''[[A Hero Falls]]''
**''[[The Hunt Begins]]''
*''[[Halo: Spartan Strike]]''
*''[[Halo: Hunters in the Dark]]''
*''[[Halo: Fleet Battles]]''
*''[[Halo: Saint's Testimony]]''
*''[[Halo: Last Light]]''
*''[[Halo: The Fall of Reach - The Animated Series]]''
*''[[Halo 5: Guardians]]''
**''[[Halo 5: Guardians Limited Edition dossiers|Limited Edition dossiers]]''
*''[[Halo: Shadow of Intent]]''
*''[[Halo Wars 2]]''
*''[[Halo: Tales from Slipspace]]''
*''[[Halo Infinite]]''
*''[[Halo: The Television Series]]''
{{col-end}}
{{col-end}}
==See Also==
*[[Sol System]]
*[[Orion Arm]]
==Trivia==
*The only known engagement or conflict to ever take place "outside" the Milky Way (considered the Outer Rim) is the [[Battle of Installation 00]].
*The Milky Way is visible from [[The Ark]].


==Sources==
==Sources==
{{Ref/Sources}}
<references/>
 
[[Category:Places]]
[[Category:Galaxies]]
[[Category:Astronomy]]

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