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{{Status|Canon}}
{{Era|Forerunner|Covenant|UNSC|HCW|Post}}
{{Wikipedia|Astronomical engineering}}
{{SeeWikipedia|Megastructure}}
[[File:TerminalArkArray.jpg|thumb|300px|[[Installation 00|The Ark]] and the [[seven]] [[Halo Array|Halo rings]].]]
'''Astroengineering''' is the name given to the construction of megastructures in space by technologically advanced beings. It is a form of megascale engineering, but deals with structures that are "easily observable" from interstellar distances with 20th century astronomical instruments: e.g. a [[space elevator]] is an example of megascale engineering, but it is not an example of astroengineering. A notable example of astroengineering are the [[Halo Array|Halo rings]], built by the technologically advanced [[Forerunner]]s.


Only civilizations with a minimum [[Technological Achievement Tiers|Technological Achievement Tier]] of 2 can construct such megastructures. As a Tier 3 civilization, the [[United Nations Space Command]] lacks known astroengineered structures.
[[File:TerminalArkArray.jpg|thumb|300px|[[Installation 00|The Ark]] and the 7 [[Halo Array|Halo rings]].]]
 
'''Astroengineering''' is name given to the construction of megastructures in space by technologically advanced beings. It is a form of megascale engineering, but deals with structures that are "easily observable" from interstellar distances with 20th century astronomical instruments: e.g. a [[space elevator]] is an example of megascale engineering, but it is not an example of astroengineering. A notable example of astroengineering are the [[Halo Array|Halo rings]], built by the technologically advanced [[Forerunner]]s.
 
Construction of these megastructures seems to be restricted to either [[Technological Achievement Tiers|Tier One]] or Tier Two civilizations. A Tier Three civilization, the [[UNSC]] has no known astroengineered structures.


==Forerunners==
==Forerunners==
[[File:Delta Halo.jpg|thumb|250px|[[Installation 05]], the second Halo discovered by the UNSC and the Covenant.]]
[[File:Delta Halo.jpg|thumb|250px|[[Installation 05]], the second Halo discovered by the UNSC and the Covenant.]]
The Forerunners are renowned for their mimicry of natural environments, but it is their engineering achievements that stand as monuments to their extraordinary prowess, centuries after they have passed on. Their [[Halo Array|Halo Installations]], [[shield world]]s, and [[Installation 00|the Ark]] are all artificial habitats on a vastly larger scale than anything that either [[human]]ity or the [[Covenant]] could have accomplished. Forerunner megastructures were typically designed by members of the [[Builder]] [[rate]] and constructed by the [[Huragok]] as well as a wide range of automatons ranging from diminutive [[Constructor]]s to colossal [[Retriever Sentinel]]s. Meanwhile, the [[Miner]]s were tasked with stellar and planetary engineering.<ref>'''Halo: Cryptum'''</ref>
The [[Forerunner]]s are renowned for their mimicry of natural environments, but it is their engineering achievements that stand as monuments to their extraordinary prowess, centuries after they have passed on. Their [[Halo Array|Halo Installations]], [[shield world]]s, and [[Installation 00|the Ark]] are all artificial habitats on a vastly larger scale than anything that either [[human]]ity or the [[Covenant]] could have accomplished. Forerunner megastructures were typically designed by members of the [[Builder]] [[rate]] and constructed by the [[Huragok]] as well as a wide range of automatons ranging from diminutive [[Constructor]]s to colossal [[Retriever Sentinel]]s. Meanwhile, the [[Miner]]s were tasked with stellar and planetary engineering.<ref>'''Halo: Cryptum'''</ref>


===Halo Array===
===Halo Array===
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A variation of the concept also exists, built in a more conventional fashion. Employed in a variation of the shield world concept known as a conservation sphere,<ref name="evg">'''[[Halo: The Essential Visual Guide]]''', ''page 174''</ref> this variation is a structure whose surface is composed of an outer shell, with a hollow interior and a habitable inner surface, and a miniaturized artificial star in the center. The interior resembles a [[Dyson sphere]], though on a far smaller scale.
A variation of the concept also exists, built in a more conventional fashion. Employed in a variation of the shield world concept known as a conservation sphere,<ref name="evg">'''[[Halo: The Essential Visual Guide]]''', ''page 174''</ref> this variation is a structure whose surface is composed of an outer shell, with a hollow interior and a habitable inner surface, and a miniaturized artificial star in the center. The interior resembles a [[Dyson sphere]], though on a far smaller scale.
While not intended to mimic planets as much as be employed as weapons of war, the [[Forerunner fleet]] employed a kind of warship known as a [[Castellan]], a "moon-sized" colossal [[battle station]].<ref name="WF86">''[[Halo: Warfleet – An Illustrated Guide to the Spacecraft of Halo|Halo: Warfleet]]'', Battle Stations - p.86-87</ref>


====Onyx====
====Onyx====
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====Shield 0459====
====Shield 0459====
{{Main|Shield 0459}}
{{Main|Shield 0459}}
This shield installation was representative of a smaller variation of the shield world concept. Known as a conservation sphere,{{Ref/Reuse|evg}} the facility consisted of a hollow spherical shell with a terraformed inner surface and an internal sun. The installation's outer surface was heavily infested by the [[Flood]].
This shield installation was representative of a smaller variation of the shield world concept. Known as a conservation sphere,<ref name="evg"/> the facility consisted of a hollow spherical shell with a terraformed inner surface and an internal sun. The installation's outer surface was heavily infested by the [[Flood]].


It was destroyed by the [[United Nations Space Command|UNSC]] forces in [[2531]] when the overloaded [[Shaw-Fujikawa Translight Engine|Slipspace drive]] of {{UNSCShip|Spirit of Fire}} sent the internal star to [[supernova]] state.
It was destroyed by the [[United Nations Space Command|UNSC]] forces in [[2531]] when the overloaded [[Shaw-Fujikawa Translight Engine|Slipspace drive]] of {{UNSCShip|Spirit of Fire}} sent the internal star to [[supernova]] state.
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===Dyson spheres===
===Dyson spheres===
{{Main|Dyson sphere}}
{{Main|Dyson sphere}}
The Forerunners also constructed massive Dyson spheres, such as the shield world known as [[Trevelyan|Shield World 006]] held within Onyx. With a diameter of 2 astronomical units,<ref>'''Halo: Ghosts of Onyx''', ''page 380''</ref> this shield world was encapsulated in a [[Slipstream space|Slipspace]] field to protect the occupants from the Halo Array as it activated. Essentially a sphere, with its habitable surface on its internal surface rather than external, these "micro" Dyson spheres are also equipped with their own stars,<ref>'''Halo: Ghosts of Onyx''', ''page 379''</ref> providing warmth, light and energy to the installation. Originally intended as a way to circumvent the Halo effect, the shield worlds were not put into use by the Forerunners due to the rampant actions of [[Mendicant Bias|one]] of their own AI constructs.<ref>'''Halo 3''', ''[[Terminal (Halo 3)|Terminal]]s''</ref>
The Forerunners also constructed massive Dyson spheres, such as the shield world known as [[Trevelyan|Shield World 006]] held within Onyx. With a diameter of 2 astronomical units,<ref>'''Halo: Ghosts of Onyx''', ''page 380''</ref> this shield world was encapsulated in a [[Slipstream space|Slipspace]] field to protect the occupants from the Halo Array as it activated. Essentially a sphere, with its habitable surface on its internal surface rather than external, these "micro" Dyson spheres are also equipped with their own stars,<ref>'''Halo: Ghosts of Onyx''', ''page 379''</ref> providing warmth, light and energy to the installation. Originally intended as a way to circumvent the Halo effect, the shield worlds were not put into use by the Forerunners due to the rampant actions of [[Mendicant Bias|one]] of their own AI constructs.<ref>'''Halo 3''', ''[[Terminal/Halo 3|Terminal]]s''</ref>


The interior of [[Trove]] was essentially a variation of this concept, albeit on a far smaller scale and not enveloped in slipspace.
The interior of [[Shield 0459]] was essentially a variation of this concept, albeit on a far smaller scale and not enveloped in slipspace.


===Installation 00===
===Installation 00===
[[File:H3 Installation00 Full.jpg|250px|thumb|[[Installation 00]]]]
[[File:ARK.jpg|250px|thumb|[[Installation 00]]]]
{{Main|Installation 00}}
{{Main|Installation 00}}
[[Installation 00]] is a Forerunner megastructure vaguely similar to an [[Wikipedia:Alderson disk|Alderson disk]] in overall shape.
[[Installation 00]] is a Forerunner megastructure vaguely similar to an [[Wikipedia:Alderson disk|Alderson disk]] in overall shape.
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With a diameter of 127,530 kilometers,<ref>'''Halo: The Essential Visual Guide''', ''page 14''</ref> and a larger total surface area than a Halo installation, it incorporates many similar elements, including [[Earth]]-like gravity and atmosphere and a rich and diverse ecosystem. Located in the center of the installation is a [[Strip mining moon|small planetoid]], used for raw materials, and a star orbiting nearby despite its location: 2<sup>18</sup>, or 262,144 light years outside of the [[Milky Way|Milky Way Galaxy]], where stars cannot naturally form. It is possible that this is an artificial sun created by the Forerunners.<ref>'''Halo 3''', campaign level, ''[[The Ark (level)|The Ark (Level)]]''</ref>
With a diameter of 127,530 kilometers,<ref>'''Halo: The Essential Visual Guide''', ''page 14''</ref> and a larger total surface area than a Halo installation, it incorporates many similar elements, including [[Earth]]-like gravity and atmosphere and a rich and diverse ecosystem. Located in the center of the installation is a [[Strip mining moon|small planetoid]], used for raw materials, and a star orbiting nearby despite its location: 2<sup>18</sup>, or 262,144 light years outside of the [[Milky Way|Milky Way Galaxy]], where stars cannot naturally form. It is possible that this is an artificial sun created by the Forerunners.<ref>'''Halo 3''', campaign level, ''[[The Ark (level)|The Ark (Level)]]''</ref>


Rather than being a superweapon, like the Halos, the Ark functions as the control center of the Halo Array. It also served as the lead researching station for the Librarian and as a construction facility for Halos, using the planetoid to provide metals, gases, elements and other resources needed for reconstruction. After the construction is complete, the Halo is transported to its destination via a [[Slipspace portal]].
Rather than being a superweapon, like the Halos, the Ark functions as the the control center of the Halo Array. It also served as the lead researching station for the Librarian and as a construction facility for Halos, using the planetoid to provide metals, gases, elements and other resources needed for reconstruction. After the construction is complete, the Halo is transported to its destination via a [[Slipspace portal]].


Originally, an even larger [[Ark]] facility existed, known as the [[greater Ark]]. This second Ark was used to construct and repair a series of larger Halo rings. Though it differed from Installation 00 in a number of respects, it shared its general flower-like shape and was similarly located outside the galaxy.<ref>'''Halo: Primordium''', ''page 371''</ref>
Originally, an even larger [[Ark]] facility existed, known as the [[greater Ark]]. This second Ark was used to construct and repair a series of larger Halo rings. Though it differed from Installation 00 in a number of respects, it shared its general flower-like shape and was similarly located outside the galaxy.<ref>'''Halo: Primordium''', ''page 371''</ref>


===Stars===
===Stars===
[[File:Artificial sun.jpg|thumb|250px|The Ark's artificial sun]]
[[File:Artificial sun.jpg|thumb|right|250px|The Ark's artificial sun]]
The Forerunners had the ability to harness the energy output of an entire star by using containment and collection fields; dozens of stars had been harnessed for energy production this way.<ref>'''Halo: Cryptum''', ''page 243''</ref> Forerunners stellar engineers nicknamed "[[plasma jockey]]s" also experimented with controlling young stars, attempting to "tame" them for future use.{{Ref/Reuse|c221}}
The Forerunners had the ability to harness the energy output of an entire star by using containment and collection fields; dozens of stars had been harnessed for energy production this way.<ref>'''Halo: Cryptum''', ''page 243''</ref> Forerunners stellar engineers nicknamed "[[plasma jockey]]s" also experimented with controlling young stars, attempting to "tame" them for future use.<ref name="c221"/>


The Forerunners could also either create artificial stars, or move existing stars across distances of thousands of light years, either of which would be a tremendous technological feat. Additionally, they were able to extrude whole stars into slipspace. One star was used in the construction of the [[Shield World]], [[Trevelyan|Shield World 006]], while an artificial star, created just for it, orbited [[Installation 00]]. [[Trove]] also had a miniaturized artificial star in its center.
The Forerunners could also either create artificial stars, or move existing stars across distances of thousands of light years, either of which would be a tremendous technological feat. Additionally, they were able to extrude whole stars into slipspace. One star was used in the construction of the [[Shield World]], [[Trevelyan|Shield World 006]], while an artificial star, created just for it, orbited [[Installation 00]]. [[Shield World 0459]] also had a miniaturized artificial star in its center.


===Construction===
===Construction===
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==Covenant==
==Covenant==
[[File:HM-HighCharityBC.png|250px|thumb|High Charity under construction.]]
[[File:High charity and Alpha Halo.jpg|250px|thumb|High Charity, next to the ruins of [[Installation 04|Alpha Halo]]]]
Though on a far smaller scale, the Covenant have been known to build superstructures.
Though on a far smaller scale, the Covenant have been known to build superstructures.
===High Charity===
===High Charity===
{{Main|High Charity}}
{{Main|High Charity}}
High Charity was the Covenant capital city prior to 2552. Presumed to be built around a chunk of rock taken from the [[San'Shyuum]]'s home planet, it was not only an artificial planet, but capable of traveling through slipspace, powered by a surviving [[Keyship]] known to the Covenant as the [[Anodyne Spirit|Forerunner Dreadnought]]. It was the largest known Covenant artificial planetoid, at 348 kilometers in diameter, as well as the home of the majority of the [[San'Shyuum]] population, and was infested by the Flood, and eventually destroyed in the [[Battle of Installation 00]].
High Charity was the Covenant capital city prior to 2552. Presumed to be built around a chunk of rock taken from the [[San'Shyuum]]'s home planet, it was not only an artificial planet, but capable of traveling through slipspace, powered by a surviving [[Keyship]] known to the Covenant as the [[Forerunner Dreadnought]]. It was the largest known Covenant artificial planetoid, at 348 kilometers in diameter, as well as the home of the majority of the [[San'Shyuum]] population, and was infested by the Flood, and eventually destroyed in the [[Battle of Installation 00]].


===Unyielding Hierophant===
===Unyielding Hierophant===
{{Main|Unyielding Hierophant}}
{{Main|Unyielding Hierophant}}
The ''Unyielding Hierophant'' was a mobile space station used as a fleet command center and refit platform. Approximately 30 kilometers long and 10&nbsp;km in circumference, with two bulbous sections joined by a docking ring at the middle, it was a significant Covenant military base in the region, capable of resupplying up to 500 warships and carried thousands of Covenant personnel internally, including Banshee and Wraith pilots. It was destroyed by members of Spartan [[Blue Team]] during [[Operation: FIRST STRIKE]].
The ''Unyielding Hierophant'' was a mobile space station used as a fleet command center and refit platform. Approximately 30 kilometers long and 10km in circumference, with two bulbous sections joined by a docking ring at the middle, it was a significant Covenant military base in the region, capable of resupplying up to 500 warships and carried thousands of Covenant personnel internally, including Banshee and Wraith pilots. It was destroyed by members of Spartan [[Blue Team]] during [[Operation: FIRST STRIKE]].


==Human==
==Human==
While 26th-century humanity does not possess the technology required to construct megastructures on the scale of the Covenant or the Forerunners, they have built several habitats within mined-out [[asteroid]]s.
While 26th-century humanity does not possess the technology required to construct megastructures on the scale of the Covenant or the Forerunners, they have built several habitats within mined-out [[asteroid]]s.
====Ancient Human====
Despite being a Tier 1 civilization, [[Ancient humanity]] was not as experienced in the fields of megascale engineering and [[slipspace]] technology as the Forerunners. For example, they were seemingly unable to construct megastructures on the scale of a [[Halo Array|Halo installation]].<ref name="p257">'''Halo: Primordium''', ''page 257''</ref>


===Rubble===
===Rubble===
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===Eridanus Secundus===
===Eridanus Secundus===
{{Main|Eridanus Secundus}}
{{Main|Eridanus Secundus}}
Built inside a hollowed out asteroid in the [[Eridanus system]], the Eridanus cell of the [[Insurrectionist]]s hid here until their leader, [[Colonel (UNSC)|Colonel]] [[Robert Watts|Watts]] was [[Assault on Eridanus Secundus|captured]] by members of the SPARTAN-II Program. It had several factories, schools, hotels and even a hospital built inside it as well as a large docking bay. It was later destroyed by a Covenant fleet in 2552.
Built inside a hollowed out asteroid in the [[Eridanus system]], the Eridanus cell of the [[Insurrectionist]]s hid here until their leader, [[Robert Watts|Colonel Watts]] was [[Assault on Eridanus Secundus|captured]] by members of the SPARTAN-II Program. It had several factories, schools, hotels and even a hospital built inside it as well as a large docking bay. It was later destroyed by a Covenant fleet in 2552.


==Precursor==
==Precursor==
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<gallery>
<gallery>
File:Installation04 scaffolding.jpg|The foundational scaffolding beneath a Halo installation's terrestrial surface.
File:Installation04 scaffolding.jpg|The foundational scaffolding beneath a Halo installation's terrestrial surface.
File:H3 Installation 08 Scaffolding.jpg|Scaffolding islands of a Halo installation.
File:1209484737 Halo002lowrb9.jpg|Scaffolding islands of a Halo installation.
File:H3_Ark_Planetoid_Concept.jpg|Early concept art of the Ark.
File:Artificial Planets.jpg|Early concept art of the Ark.
File:H3 Artificial sun.jpg|A image of the artificial sun at the Ark.
File:1209584069 MountainsoftheArk.jpg|A mountain range on the Ark in panorama.
File:1209584069 MountainsoftheArk.jpg|A mountain range on the Ark in panorama.
File:HE-23-ArtiPlanet.png|A planet with twelve moons, each containing [[design seed]]s.
File:HE-23-ArtiPlanet.png|A planet with twelve moons, each containing [[design seed]]s.
</gallery>
</gallery>


==See also==
* [[Space station]]
==Sources==
==Sources==
{{Ref/Sources}}
<references/>


{{Forerunner|technology}}
{{Forerunner|technology}}
[[Category:Astronomy]]
[[Category:Astronomy]]
[[Category:Forerunner technology]]
[[Category:Forerunner technology]]

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