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{{Era|Forerunner|HCW|Post}}
{{Status|Canon}}
[[File:Milky-Way-labeled.jpg|thumb|right|300px|The Sagittarius Arm is named for its proximity to the [[Wikipedia:Sagittarius (constellation)|Sagittarius]] constellation when viewed from [[Earth]].]]
[[File:Milky-Way-labeled.jpg|thumb|300px|The Sagittarius Arm is named for its proximity to the [[Wikipedia:Sagittarius (constellation)|Sagittarius]] constellation when viewed from [[Earth]].]]
The '''Sagittarius Arm''' is a minor [[Wikipedia:Spiral_galaxy#Spiral_arms|spiral arm]] of the [[Milky Way galaxy]].<ref name="HW1213"/> It lies between the [[Wikipedia:Scutum–Centaurus Arm|Scutum–Centaurus Arm]] further toward the galactic core and the [[Wikipedia:Perseus Arm|Persus Arm]] further toward the outer rim. The [[Orion Arm]], or Orion Spur, branches off from the Sagittarius Arm.<ref name="HW1213"/><ref name="HEPJC"/>
The '''Sagittarius Arm''' is a minor [[Wikipedia:Spiral_galaxy#Spiral_arms|spiral arm]] of the [[Milky Way galaxy]].{{Ref/Reuse|HW1213}} It lies between the [[Wikipedia:Scutum–Centaurus Arm|Scutum–Centaurus Arm]] further toward the galactic core and the [[Wikipedia:Perseus Arm|Persus Arm]] further toward the outer rim. The [[Orion Arm]], or Orion Spur, branches off from the Sagittarius Arm.{{Ref/Reuse|HW1213}}{{Ref/Reuse|HEPJC}}


==History==
==History==
The Milky Way's Sagittarius Arm was explored by the [[Forerunner]]s thousands of years ago and at least two [[shield world]]s were constructed in distal star systems of this arm.<ref name="HW1213"/> Both shield worlds [[Shield World 006|006]] and [[Shield World 10021|10021]] were built under the direction of [[Warrior-Servant]]s during this time, with the former being constructed in the [[Zeta Doradus system]].<ref name="HW1213"/> Prior to the [[Great Purification|firing]] of the [[Halo Array]] in [[97,445 BCE]], the [[Halo ring|ring]s] known as [[Installation 01]] and [[Installation 07]] were transported from [[Installation 00]] points in the Sagittarius Arm.<ref name="HW1213">''[[Halo Warfleet]]'', ''pages 12-13''</ref> Installation 01 was placed at the Array's Beta position distal to the the offshoot of the Orion Spur and Installation 07 was placed at the Zeta position, proximal to Orion.<ref name="HW1213"/> It was from these locations that Beta Halo and Zeta Halo killed every unprotected life form with even the most rudimentary of [[Wikipedia:Nervous system|nervous system]]s within twenty-five thousand [[Wikipedia:Light-Year|light-year]]s of each.<ref name="ENC184">''[[Halo Encyclopedia]]'', ''page 184''</ref><ref name="HCETB">''[[Halo: Combat Evolved]]'', ''[[Two Betrayals]]''</ref>
The Milky Way's Sagittarius Arm was explored by the [[Forerunner]]s thousands of years ago and at least one [[shield world]], designated [[Shield World 10021|10021]], was constructed under the direction of [[Warrior-Servant]]s in a distal star system of this arm.{{Ref/Reuse|HW1213}} Prior to the [[Great Purification|firing]] of the [[Halo Array]] in [[97,445 BCE]], the [[Halo ring|rings]] known as [[Installation 01]] and [[Installation 07]] were transported from the [[Intergalactic space|extragalactic]] [[Installation 00]] to points in the Sagittarius Arm.<ref name="HW1213">''[[Halo Warfleet]]'', ''pages 12-13''</ref> Installation 01 was placed at the Array's Beta position distal to the offshoot of the Orion Spur and Installation 07 was placed at the Zeta position, proximal to Orion.{{Ref/Reuse|HW1213}} It was from these locations that Beta Halo and Zeta Halo killed every unprotected life form with even the most rudimentary of [[Wikipedia:Nervous system|nervous system]]s within twenty-five thousand [[Wikipedia:Light-Year|light-year]]s of each.<ref name="ENC184">''[[Halo Encyclopedia (2009 edition)]]'', ''page 184''</ref><ref name="HCETB">''[[Halo: Combat Evolved]]'', ''[[Two Betrayals]]''</ref>


At the end of the twenty-fifth century, the planet [[Onyx]], which hid [[Shield World 006]], became the subject of focused investigation by the [[United Nations Space Command]].<ref name="HGOO13">''[[Halo: Ghosts of Onyx]]'', ''Chapter 13''</ref> The [[Office of Naval Intelligence]] went on to use Onyx to host its top-secret [[Spartan-III program]].<ref name="HGOO6">''[[Halo: Ghosts of Onyx]]'', ''Chapter 6''</ref> Following a large [[2543]] [[Battle of Psi Serpentis|battle]] in the [[Psi Serpentis system]] between [[UNSC]] [[Battle Group India]] and two [[Covenant]] fleets, scattered reports of independent [[human]] forces fighting the Covenant began to pop up on the outer edge of what the [[Office of Naval Intelligence]] believed to be nonsanctioned human [[Human colonies|conolnized]] space.<ref name="HEPJC"/> These reports tracked toward the Sagittarius side of the Orion Spur.<ref name="HEPJC">''[[Halo: Evolutions]]'', ''[[The Impossible Life and the Possible Death of Preston J. Cole]]''</ref> Near the end of the [[Human-Covenant War|war]] between the Covenant and humanity, a [[Onyx Conflict|battle]] was fought at Onyx.<ref name="HM113">''[[Halo Mythos]]'', ''page 113''</ref> Following the conflict's conclusion, Shield World 006 became the subject of human exploration and an [[Treaty of 2552|agreement]] between the [[Unified Earth Government]] and the [[Swords of Sanghelios]] resulted in a select group of humans, [[Sangheili]], and [[Unggoy]] living within the shield world together.<ref name="HLOO4">''[[Halo: Legacy of Onyx]]'', ''Chapter 4''</ref> Installation 07 was discovered by humans a few years after the war and before long the UNSC [[Zeta Halo project|dispatched]] of researchers to study it. When the rogue [[artificial intelligence]]s calling themselves "the [[Created]]" attempted to seize power throughout the galaxy, Shield World 006 was pulled beyond their reach by being hidden within a small [[slipspace bubble]].<ref name="HLOO37">''[[Halo: Legacy of Onyx]]'', ''Chapter 37''</ref>
Following a large [[2543]] [[Battle of Psi Serpentis|battle]] in the [[Psi Serpentis system]] between [[UNSC]] [[Battle Group India]] and two [[Covenant]] fleets, scattered reports of independent [[human]] forces fighting the Covenant began to pop up on the outer edge of what the [[Office of Naval Intelligence]] believed to be nonsanctioned human [[Human colonies|colonized]] space.{{Ref/Reuse|HEPJC}} These reports tracked toward the Sagittarius side of the Orion Spur.<ref name="HEPJC">''[[Halo: Evolutions]]'', ''[[The Impossible Life and the Possible Death of Preston J. Cole]]''</ref> Following the end of the [[Human-Covenant War|war]] between the Covenant and humanity, Installation 07 was discovered by humans a few years after the war and before long the UNSC [[Zeta Halo project|dispatched]] researchers to study it.<ref>''[[Halo: Hunters in the Dark]]''</ref>


==Locations==
==Locations==
The Sagittarius Arm holds a number of [[Forerunner]] [[Astroengineering|constructions]]. Proximal to the Orion Spur lies [[Installation 07]].<ref name="HW1213"/> [[Shield World 10021]] can be found just beyond the Orion-Sagittarius junction and further beyond it are [[Installation 01]] and then the [[Zeta Doradus system]], home to [[Shield World 006]].<ref name="HW1213"/>
The Sagittarius Arm holds a number of [[Forerunner]] [[Astroengineering|constructions]]. Proximal to the Orion Spur lies [[Installation 07]].{{Ref/Reuse|HW1213}} [[Shield World 10021]] can be found just beyond the Orion-Sagittarius junction and further beyond it is [[Installation 01]].{{Ref/Reuse|HW1213}}{{Ref/Note|A galaxy map featured in ''Halo: Warfleet'' places [[Shield World 006]] within the Sagittarius Arm. This is considered a liberty for the sake of visual presentation, as the [[Zeta Doradus system]]—which houses the shield world—is located well within the Orion Arm a mere 38 light-years from Earth.}}


==Gallery==
==Gallery==
<GALLERY>
<gallery>
File:XF-063 04-02-2491 150x150 p1.png|The arrow points to the location of Onyx within the Zeta Doradus system.<ref name="DD1">[[Data Drop]] [[Data Drop/One|One]]</ref>
File:H5G - Milky Way.png|The Covenant was evidently familiar with a number of locations in the Sagittarius Arm.<ref name="H5GT">''[[Halo 5: Guardians]]'', ''[[Truth (level)|Truth]]''</ref>
File:H5G - Milky Way.png|The Covenant was evidently familiar with a number of locations in the Sagittarius Arm.<ref name="H5GT">''[[Halo 5: Guardians]]'', ''[[Truth (level)]]''</ref>
</gallery>
</GALLERY>


==List of Appearances==
==List of appearances==
{{col-begin}}
*''[[Halo 3]]'' {{1st}}
{{col-2}}
*''[[Halo: Ghosts of Onyx]]'' {{1st}}
*''[[Halo 3]]''
*''[[Remember Reach]]''
**''[[Birth of a Spartan]]''
*''[[Halo: Evolutions]]''
*''[[Halo: Evolutions]]''
**''[[The Impossible Life and the Possible Death of Preston J. Cole]]'' {{Mo}}
**''[[The Impossible Life and the Possible Death of Preston J. Cole]]'' {{Mo}}
*''[[Halo: Glasslands]]''
{{col-2}}
*''[[Halo: Hunters in the Dark]]''
*''[[Halo: Hunters in the Dark]]''
*''[[Halo 5: Guardians]]'' {{C|holographic projection}}
*''[[Halo 5: Guardians]]'' {{C|holographic projection}}
*''[[Halo Mythos]]''
*''[[Halo Mythos]]''
*''[[Halo: Fractures]]''
*''[[Halo: Point of Light]]''
**''[[Lessons Learned]]''
*''[[Halo Infinite]]''
*''[[Halo: Legacy of Onyx]]''
 
{{col-end}}
==Notes==
{{Ref/Notes}}


==Sources==
==Sources==
{{Reflist|2}}
{{Ref/Sources|2}}


[[Category:Astronomy]]
[[Category:Astronomy]]

Latest revision as of 11:38, April 12, 2023

The Sagittarius Arm is named for its proximity to the Sagittarius constellation when viewed from Earth.

The Sagittarius Arm is a minor spiral arm of the Milky Way galaxy.[1] It lies between the Scutum–Centaurus Arm further toward the galactic core and the Persus Arm further toward the outer rim. The Orion Arm, or Orion Spur, branches off from the Sagittarius Arm.[1][2]

History[edit]

The Milky Way's Sagittarius Arm was explored by the Forerunners thousands of years ago and at least one shield world, designated 10021, was constructed under the direction of Warrior-Servants in a distal star system of this arm.[1] Prior to the firing of the Halo Array in 97,445 BCE, the rings known as Installation 01 and Installation 07 were transported from the extragalactic Installation 00 to points in the Sagittarius Arm.[1] Installation 01 was placed at the Array's Beta position distal to the offshoot of the Orion Spur and Installation 07 was placed at the Zeta position, proximal to Orion.[1] It was from these locations that Beta Halo and Zeta Halo killed every unprotected life form with even the most rudimentary of nervous systems within twenty-five thousand light-years of each.[3][4]

Following a large 2543 battle in the Psi Serpentis system between UNSC Battle Group India and two Covenant fleets, scattered reports of independent human forces fighting the Covenant began to pop up on the outer edge of what the Office of Naval Intelligence believed to be nonsanctioned human colonized space.[2] These reports tracked toward the Sagittarius side of the Orion Spur.[2] Following the end of the war between the Covenant and humanity, Installation 07 was discovered by humans a few years after the war and before long the UNSC dispatched researchers to study it.[5]

Locations[edit]

The Sagittarius Arm holds a number of Forerunner constructions. Proximal to the Orion Spur lies Installation 07.[1] Shield World 10021 can be found just beyond the Orion-Sagittarius junction and further beyond it is Installation 01.[1][Note 1]

Gallery[edit]

  • The Covenant was evidently familiar with a number of locations in the Sagittarius Arm.[6]

    The Covenant was evidently familiar with a number of locations in the Sagittarius Arm.[6]

List of appearances[edit]

Notes[edit]

  1. ^ A galaxy map featured in Halo: Warfleet places Shield World 006 within the Sagittarius Arm. This is considered a liberty for the sake of visual presentation, as the Zeta Doradus system—which houses the shield world—is located well within the Orion Arm a mere 38 light-years from Earth.

Sources[edit]

  1. ^ a b c d e f g Halo Warfleet, pages 12-13
  2. ^ a b c Halo: Evolutions, The Impossible Life and the Possible Death of Preston J. Cole
  3. ^ Halo Encyclopedia (2009 edition), page 184
  4. ^ Halo: Combat Evolved, Two Betrayals
  5. ^ Halo: Hunters in the Dark
  6. ^ Halo 5: Guardians, Truth
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