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{{ratings}}
{{Status|Canon}}
{{Era|H1|H2|TF|HE}}
{{Planet infobox
{{Planet
|name=Threshold
|name=Threshold
|image=[[Image:Threshold.png|200px]]
|image=[[File:H5G Threshold.png|300px]]
|star, position=Soell System, Soell
|system=[[Soell system]]<ref name="universe">[https://www.halowaypoint.com/en-us/universe/locations/threshold '''Halo Waypoint''': ''Threshold'']</ref><ref name="vis">'''[[Halo: The Essential Visual Guide]]''', ''page 195''</ref>
|moon(s)= Basis
|body=[[Soell]]{{Ref/Reuse|universe}}{{Ref/Reuse|vis}}
|satellite(s)= None
|position=Seventh planet{{Ref/Reuse|universe}}{{Ref/Reuse|vis}}
|gravity=  
|moon(s)=Twelve, including [[Basis]]{{Ref/Reuse|universe}}
|daylength=About 10 hours{{fact}}
|diameter={{Convert|214604|km|mi|sigfig=7|sp=us}}{{Ref/Reuse|universe}}
|yearlength= About 200-300 years{{fact}}
|gravity=
|atmosphere= Ammonia Clouds {{fact}}
|daylength=
|surface temperature= About 43°C {{fact}}
|yearlength=
|population=  
|atmosphere=;Gases:
|species=  
[[Hydrogen]], [[helium]], [[methane]]{{Ref/Reuse|universe}}
|societal approximation=  
;Liquids:
|government=  
[[Ammonia]], [[water]],{{Ref/Reuse|vis}} [[Wikipedia:Ammonium hydrosulfide|ammonium hydrosulfide]], [[phosphorus]] compounds<ref name="atmo">'''[[Halo: First Strike]]''', ''page 79''</ref>
|technology tier=
|temperature=
|current threat to array=
|demonym=Thresholdian{{Ref/Reuse|universe}}
|species=
|population=
|colonized=
|government=*[[Ecumene]]<ref name="ENC310">'''[[Halo Encyclopedia (2009 edition)]]''', ''page 310'' (2011)</ref> {{C|formerly}}
*[[Covenant]]{{Ref/Reuse|ENC310}} {{C|briefly}}
}}
}}
'''Threshold''' is a planet in the [[Soell]] star system.<ref name="sybex-halo">'''[[Halo: Combat Evolved: Sybex Official Strategies & Secrets]]''', ''Chapter 5, page 63''</ref> It is an immense gas giant with a radius of 107,302 km (66,674.5 miles), and one natural satellite, [[Basis]] which has a radius of 11,924 kilometers. The atmosphere is made up of white [[Ammonia]] clouds, amber-colored [[Ammonium Hydrosulfide]] clouds, [[Phosphorus]] compounds, ice crystals and other gases. Threshold is known to have storms in its atmosphere similar to the storms that occur on the planet [[Jupiter]], since there was a large storm present at the [[Battle of the Gas Mine]].


Threshold's [[Earth]] Survey Catalog number is B1008-AG.<ref name="sybex-halo"/>
'''Threshold''', also known as '''Soell VII''',<ref name="Halo Channel">'''[[Halo Channel]]''': ''Encyclopedia''</ref> is a gas giant, and the seventh and largest planet in the [[Soell system]].{{Ref/Reuse|vis}} It was the gravity anchor for [[Installation 04]], which was situated at the L<sub>1</sub> [[Lagrange point]] between Threshold and its largest [[natural satellite]], [[Basis]].<ref name="sybex-halo">'''[[Halo: Combat Evolved: Sybex Official Strategies & Secrets]]''', ''page 63''</ref>


==Forerunner Activity==
Threshold's [[Earth Survey Catalog]] number is '''B1008-AG'''.{{Ref/Reuse|sybex-halo}}
Over 100,000 years ago, Threshold was a part of the sizable and extensive [[Forerunner]] empire. They built at least one automated, viable [[Gas Mine]] complex in the upper atmosphere of the planet, likely harvesting the hydrogen gas of the planet. The hydrogen was probably used as transmutation material for construction, though this is not confirmed. Threshold was a [[neutral]] location.


Several hundred or thousand years later, upon the discovery of the [[Flood]], the Forerunners refitted the Gas Mines to serve as [[Flood Research Facilities]]. These facilities proved only one thing: more extreme measures were needed to combat the Flood and to keep them from spreading.
==History==
===Prehistory===
Over 100,000 years ago, Threshold was a part of the sizeable and extensive [[Forerunner]] [[ecumene]]. Wishing to harvest the gas giant's rare and valuable gases, the Forerunners used Threshold as a mining colony.{{Ref/Reuse|ENC310}} They built numerous automated gas mining complexes in the upper atmosphere of the planet, tethered to several band orbitals, used for harvesting the [[hydrogen]], [[helium]], and [[methane]] gas of the planet.<ref name="gasmine">[https://www.halowaypoint.com/en-us/universe/locations/threshold-gas-mine '''Halo Waypoint''': ''Threshold Gas Mine'']</ref>


The Forerunners, then chose the planet as a staging point to construct one of their massive fortress worlds, known as [[Halo]] and numbered as [[Installation 04]]. The Halo was constructed on the Lagrange point between Threshold and Basis and was designed to destroy all sentient life in the galaxy, thereby halting the spread of the Flood, due to starvation.
Upon the discovery of the [[Flood]], the Forerunners refitted some of the gas mines to serve as a [[Flood research facility|Flood research facilities]]. These facilities proved only one thing: more extreme measures were needed to combat the Flood and to keep them from spreading. At the end of [[Forerunner-Flood war|their war]] against the Flood, the Forerunners chose Threshold as a staging point for one of the [[Halo Array|Halo]] superweapons: [[Installation 04]]. The Halo was placed on the L<sub>1</sub> [[Lagrange point]] between Threshold and [[Basis]] and was designed to destroy all [[sentience|sentient]] life in the galaxy, thereby halting the spread of the Flood, due to starvation.<ref>'''[[Halo 2]]''', campaign level ''[[The Oracle]]''</ref>


In [[2552]], the [[Covenant Empire|Covenant]] were looking for an artifact from [[Sigma Octanus IV]] to uncover this planet as the location of the "Sacred Ring", in order to start the Great Journey. The [[Fleet of Particular Justice]] followed the [[UNSC Pillar of Autumn|UNSC ''Pillar of Autumn'']] there, and, [[Battle of Installation 04|in a series of events]], Installation 04 was destroyed.<ref>'''[[Halo: Combat Evolved]]''', ''[[The Maw (Level)|The Maw]]''</ref>
===Human-Covenant War===
[[File:H2A Cutscene CovenantAtI04.png|thumb|250px|left|Threshold and Installation 04 are discovered by the [[Covenant]].]]
In [[2552]], the [[Fleet of Particular Justice]] followed the {{UNSCShip|Pillar of Autumn}} to Threshold, and, [[Battle of Installation 04|in a series of events]], Installation 04 was destroyed.<ref>'''[[Halo: Combat Evolved]]''', campaign level ''[[The Maw]]''</ref> Many pieces of debris from Installation 04 were pulled into Threshold's gravity well, or its moon Basis, and destroyed.<ref>'''[[Halo: Evolutions]]''', "[[The Mona Lisa]]", ''page 232''</ref><ref>'''[[Halo 2]]''', multiplayer map ''[[Burial Mounds]]''</ref><ref>[https://www.halowaypoint.com/en-us/universe/locations/halo-ring-fragment '''Halo Waypoint''': ''Alpha Shard'']</ref> In the [[skirmish over Threshold]] after the ring's destruction, [[Cortana]] was able to jump into [[slipspace]] with the Covenant {{Pattern|Ruma|light carrier}} ''[[Ascendant Justice]]'' while in Threshold's atmosphere.<ref>'''Halo: First Strike''', ''page 114'' (2010)</ref>


The [[Heretics]] then took refuge on the Gas Mine (they had been based at a [[Burial Mounds (Level)|makeshift camp]] on Basis until this point) before the Arbiter, [[Thel 'Vadamee]], and his Special Ops troops dropped it into Threshold's depths. ''[[High Charity]]'' and its [[Fleet]] briefly visited Threshold as well, until they [[Slipspace|jumped]] to [[Installation 05]]. The UNSC prison ship the ''Mona Lisa'' ended up picking up Covenant survivors in the system including one infected by the Flood and ONI began experiments with the Flood on the ship before the Flood escaped and the ''Mona Lisa'' was destroyed by a nuclear missile fired by the UNSC ''Red Horse''.  Also in the system at the time was a single Covenant ship apparently left behind to monitor or guard the Halo's remains, which are gradually being pulled into Threshold and destroyed.
During the battle, the Covenant dispatched an artifact retrieval group led by [[Sesa 'Refumee]] to one of the gas mining platforms in Threshold's atmosphere.<ref>'''Halo Encyclopedia: The Definitive Guide to the Halo Universe''', ''page 243''</ref> After Halo's destruction, the installation's monitor, [[343 Guilty Spark]], traveled to the gas mine and edified 'Refumee on the true nature of the Halos. Convinced that the [[Covenant religion]] was false, 'Refumee and his troops rebelled against the Prophets and were branded [[Sesa 'Refumee's heretic faction|heretics]] as a result.<ref>'''[[Halo: Combat Evolved Anniversary]]''', ''[[Terminal (Halo: Combat Evolved Anniversary)|Terminal 11]]''</ref> The newly-appointed [[Arbiter]], [[Thel 'Vadam]]ee, and a [[Covenant Special Operations]] contingent were dispatched to silence the heretics; at the conclusion of the [[Raid on the Threshold gas mine|resulting conflict]], the gas mine was dropped into Threshold's depths. ''[[High Charity]]'' and [[High Charity defense fleet|its fleet]] briefly visited Threshold as well, until they [[Slipstream space|jumped]] to [[Installation 05]].<ref>'''Halo 2''', campaign level ''[[The Arbiter]]''</ref>


== Size ==
At one point in October, the [[human]] [[prison ship]] ''[[Mona Lisa]]'' ended up picking up Covenant survivors over Threshold including one infected by the Flood. The [[Office of Naval Intelligence]] began experiments with the Flood on the ship before the Flood escaped and the ''Mona Lisa'' was destroyed by a [[Shiva-class nuclear missile|nuclear missile]] fired by {{UNSCShip|Red Horse}}. Also in the system at the time was a single Covenant ship apparently left behind to monitor or guard the Halo's remains.<ref>'''Halo: Evolutions''', "The Mona Lisa", ''page ???''</ref>
Threshold is an immense gas giant, far larger than Jupiter from the [[Sol System]]. Its moon, Basis, is in fact the size of a huge rock planet. Basis' diameter is nearly double that of the Earth.


{{Wide Image|HaloPlanets.jpg|1400px|A size comparison between [[Alpha Halo]], '''Threshold''', and the planets in the [[Sol]] [[Solar System]].<ref>[http://nikon.bungie.org/misc/sloftus_planetscale/ '''Halo.bungie.org''': ''Loftus Planet Scale'']</ref>}}
===Post-Covenant War===
After the Human-Covenant War, a 500 light-second exclusion zone was established around Threshold, with both [[Sangheili]] and human warships patrolling the region as part of the [[Treaty of 2552|post-war treaty]] between those species. Uncontrolled [[Sentinel]]s, volatile Halo fragments, micro-debris, malfunctioning Forerunner artifacts, and the ever-present danger of the Flood made even surreptitious exploration and scavenging too dangerous for most. In [[2556]], [[Fireteam Apollo]] was secretly deployed to the exclusion zone as part of [[Operation: SHELL GAME]].<ref>'''[[Halo Legendary Crate]]''', ''[[Halo Legendary Crate/Data Drops|Data Drop #3]]''</ref> One of Threshold's gas mines is the location of a [[War Games]] [[Colossus (map)|simulation]], a favorite among [[Spartan Operations|Spartan]] fireteam leaders.{{Ref/Reuse|universe}}


==Description==
===Composition and atmosphere===
[[File:H2A - Threshold gas mine.jpg|thumb|250px|A raging storm near a gas mine in Threshold's upper atmosphere.]]
Threshold is an immense gas giant with a diameter of {{Convert|214604|km|mi}}, and twelve satellites, several of which are Forerunner installations. Threshold is the largest planet in the [[Soell system]], and the seventh planet in Soell's orbit.{{Ref/Reuse|vis}} Threshold is purplish-orange in color,<ref>'''[[Halo: The Flood]]''', ''page 12'' (2010)</ref> and contains many rare and valuable gases.{{Ref/Reuse|ENC310}} Threshold's atmosphere is made up of white [[ammonia]] clouds, amber-colored [[wikipedia:Ammonium hydrosulfide|ammonium hydrosulfide]] clouds, [[phosphorus]] compounds, ice crystals and other gases. The clouds are arranged in thin, tendril-like formations and resemble sinuous ribbons.{{Ref/Reuse|atmo}} The planet's winds blow at hundreds of kilometers an hour. Threshold is known to have storms frequently rage in its atmosphere similar to the storms that occur on the planet [[Jupiter]].<ref>'''[[Halo 2]]''', campaign levels ''[[The Arbiter]]'' and ''[[The Oracle]]''</ref><ref>'''Halo: Evolutions''', "The Mona Lisa", ''page 239''</ref> The planet has a core of liquid hydrogen.<ref>'''Halo 2''', campaign level ''[[The Oracle]]'' (343 Guilty Spark: ''"The Flood will not survive once this mine enters the planet's liquid hydrogen core. Then again, neither will we. What a pity..."'')</ref>
The pressure inside the gas giant is extremely powerful, and effectively able to crush any object that delves too deep into the planet's atmosphere. Threshold has a powerful magnetosphere that is easily capable of disrupting the magnetic fields of [[plasma weaponry]] such as [[plasma torpedo]]es. The temperature of the outer atmosphere of Threshold is around three hundred degrees Celsius.<ref>'''Halo: First Strike''', ''pages 101-102'' (2010)</ref> Further down, in the planet's denser atmosphere, temperatures reach over seventeen hundred degrees Celsius.<ref>'''Halo: First Strike''', ''page 107'' (2010)</ref>
===Satellites===
[[File:Installation 04 Terminal.jpg|thumb|250px|left|The orbiting Installation 04 and asteroids.]]
Threshold is orbited by twelve satellites. Threshold's largest [[natural satellite]], is called [[Basis]]. The other satellites of Threshold are significantly smaller, but are nonetheless host to various [[Forerunner]] facilities.{{Ref/Reuse|vis}} Although none of Threshold's satellites have been extensively surveyed, all but two of them appear to contain Forerunner installations or are entirely artificial. The outposts functions are unknown, but they were likely used to provide maintenance for [[Installation 04]].{{Ref/Reuse|universe}} Several small [[asteroid]]s also orbit Threshold, near Installation 04.<ref>'''Halo: Combat Evolved Anniversary''', ''[[Terminal (Halo: Combat Evolved Anniversary)|Terminal 7]]''</ref>
The most notable of Threshold's orbiting installations was Installation 04, situated at the L<sub>1</sub> [[Lagrange point]] between Threshold and Basis.{{Ref/Reuse|universe}} Threshold's atmosphere is home to an extensive network of Forerunner [[Threshold gas mine|gas mining platforms]] and refinery stations, hanging from a band-like low-orbital suspension grid in the upper atmosphere.{{Ref/Reuse|vis}}{{Ref/Reuse|gasmine}} Although, by the mid-26th century, only a handful of these mines and refineries remain operational.{{Ref/Reuse|universe}} The Forerunner space station designated [[Deep-Space Anomaly 0198]] by the UNSC is also in high orbit over the gas giant.<ref>'''[[Halo: Combat Evolved]]''', multiplayer map ''[[Derelict]]''</ref>
{{Clear}}
==Trivia==
==Trivia==
*The inner core of Threshold is liquid nitrogen, as told by [[343 Guilty Spark (Monitor)|343 Guilty Spark]], during the battle with the [[Heretic]] Leader, [[Sesa 'Refumee]].
{{Linkbox|gallery=yes}}
*Threshold is described as purple in the book, ''[[Halo: The Flood]]'', though throughout ''[[Halo: Combat Evolved]]'' and ''[[Halo 2]]'', it is only shown as orange. This may be caused by the position of the system's sun at different times or the proximity to the gas giant.
*Threshold is described as purple in the book, ''[[Halo: The Flood]]'', though throughout ''[[Halo: Combat Evolved]]'' and ''[[Halo 2]]'', it is only shown as orange. Also, the planet is depicted as being light blue in the motion comic adaptation of ''[[The Mona Lisa]]''.<ref name="SDCC">[http://www.youtube.com/watch?v=8bEMmNEHbr0 '''YouTube''': ''SDCC: Halo Universe Panel (Part 5)'']</ref> This may be caused by the position of the system's sun at different times or the proximity to the gas giant, or may simply be an oversight.
*In ''[[Halo: Combat Evolved]]'', the [[Assault Rifle]]'s compass arrow points at the gas giant.
*In ''[[Halo: Combat Evolved]]'', ''[[Halo 2]]'' and most other visual media, Threshold's surface texture resembles that of a terrestrial world more than a conventional gas giant. The planet's appearance is revised in ''[[Halo 2: Anniversary]]'' to more accurately reflect its nature, with its face now covered in latitudinal cloud bands characteristic of gas giants. The same is true with ''[[Halo 5: Guardians]]'' on the maps ''[[Paralax]]'' and ''[[Truth]]''.
*In the book ''[[Halo: First Strike]]'', [[Cortana]] is able to jump into [[slipspace]] with the Covenant flag ship ''[[Ascendant Justice]]'' through Threshold's atmosphere.
*In ''Halo: Combat Evolved'', the [[MA5B assault rifle|assault rifle]]'s compass arrow points at the gas giant. This suggests that Threshold's atmosphere contains a large amount of iron particles, or that the assault rifles use a digital compass and that the Alpha Halo happens to be situated so that Threshold is aligned with the rifle's north during the events of the game.
*Although Threshold has been charted by the UNSC, there is no explanation for how humanity failed to notice the Alpha Halo in its orbit. Humanity had charted Threshold and at least one satellite, its moon, Basis.
* Microsoft's Windows 10 operating system is codenamed Threshold, after the planet in the Halo franchise.<ref name="ZDNet">[http://www.zdnet.com/article/microsoft-codename-threshold-the-next-major-windows-wave-takes-shape/ '''ZDNet''': ''Microsoft codename Threshold: The next major Windows wave takes shape'']</ref> Threshold joins Project Spartan and Cortana as references to the Halo franchise in the Windows 10 release.


==Gallery==
==Gallery==
<gallery>
<gallery>
File:HCE-ThresholdGasGiant.png|Crop of Threshold.
File:Threshold.png|Alternate view of the gas giant Threshold.
File:HCE-Threshold.jpg|Full view of the gas giant Threshold.
File:Threshold.jpg|The planet Threshold.
File:Threshold.jpg|The planet Threshold.
File:HCE Threshold View.jpg|Threshold as seen from Installation 04.
File:Gasgiant.jpg|A storm near the gas mine of Threshold.
File:Gasgiant.jpg|A storm near the gas mine of Threshold.
File:Threshold2.png|Threshold at night.
File:LFA-43 Halo.png|Threshold with Installation 04 and [[John-117]]'s lifepod in the foreground as it descends to the ring; the Milky Way galaxy can be seen in the distance.
File:H2A Terminals - Fleet waiting for Autumn.jpg|The Covenant discover Threshold and Installation 04.
File:HCE-HaloRingLoadingScreen.jpg|Threshold as seen on the [[Halo: Combat Evolved (PC port)|''Halo: Combat Evolved'' for PC]] loading screen.
HaloPlanets.jpg|A size comparison between Threshold and several other celestial objects.
File:H2A - Alpha Halo remains.jpg|Threshold with the remnants of the destroyed Installation 04 and the Covenant fleet in orbit.
File:H5G Threshold.png|Threshold in ''[[Halo 5: Guardians]]''.
File:H5G-Truth-Hologram of Soell VII.png|Threshold hologram in ''Halo 5: Guardians''.
</gallery>
</gallery>
==List of appearances==
{{col-begin}}
{{col-3}}
*''[[Halo: The Fall of Reach]]'' {{1st}}
*''[[Halo: Combat Evolved]]''
*''[[Halo: The Flood]]''
*''[[Halo: First Strike]]''
*''[[Halo 2]]''
*''[[Halo Legends]]''
**''[[Origins]]''
*''[[Halo: Evolutions]]''
**''[[The Mona Lisa]]''
{{col-3}}
*''[[Halo: Reach]]''
*''[[Halo: Combat Evolved Anniversary]]''
**''[[Terminal (Halo: Combat Evolved Anniversary)|Terminals]]''
*''[[Halo: Escalation]]''
*''[[Halo 2: Anniversary]]''
**''[[Terminal (Halo 2: Anniversary)|Terminals]]''
*''[[Halo 5: Guardians]]''
*''[[Halo Mythos]]
{{col-3}}
*''[[Halo: Tales from Slipspace]]''
**''[[Dominion Splinter]]'' {{C|Flashback}}
*''[[Halo: Fireteam Raven]]''
*''[[Halo: Official Spartan Field Manual]]''
{{col-end}}


==Sources==
==Sources==
<references/>
{{Ref/Sources|2}}
 
[[Category:Planets]]
[[Category:Planets]]

Latest revision as of 05:48, February 8, 2023

Threshold
H5G Threshold.png
Astrographical

System:

Soell system[1][2]

Orbiting:

Soell[1][2]

Orbital position:

Seventh planet[1][2]

Moon(s):

Twelve, including Basis[1]

Physical

Diameter:

214,604 kilometers (133,348.7 mi)[1]

Atmosphere:

Gases

Hydrogen, helium, methane[1]

Liquids

Ammonia, water,[2] ammonium hydrosulfide, phosphorus compounds[3]

Societal

Demonym:

Thresholdian[1]

Government:

 

Threshold, also known as Soell VII,[5] is a gas giant, and the seventh and largest planet in the Soell system.[2] It was the gravity anchor for Installation 04, which was situated at the L1 Lagrange point between Threshold and its largest natural satellite, Basis.[6]

Threshold's Earth Survey Catalog number is B1008-AG.[6]

History[edit]

Prehistory[edit]

Over 100,000 years ago, Threshold was a part of the sizeable and extensive Forerunner ecumene. Wishing to harvest the gas giant's rare and valuable gases, the Forerunners used Threshold as a mining colony.[4] They built numerous automated gas mining complexes in the upper atmosphere of the planet, tethered to several band orbitals, used for harvesting the hydrogen, helium, and methane gas of the planet.[7]

Upon the discovery of the Flood, the Forerunners refitted some of the gas mines to serve as a Flood research facilities. These facilities proved only one thing: more extreme measures were needed to combat the Flood and to keep them from spreading. At the end of their war against the Flood, the Forerunners chose Threshold as a staging point for one of the Halo superweapons: Installation 04. The Halo was placed on the L1 Lagrange point between Threshold and Basis and was designed to destroy all sentient life in the galaxy, thereby halting the spread of the Flood, due to starvation.[8]

Human-Covenant War[edit]

Threshold and Installation 04 are discovered by the Covenant.

In 2552, the Fleet of Particular Justice followed the UNSC Pillar of Autumn to Threshold, and, in a series of events, Installation 04 was destroyed.[9] Many pieces of debris from Installation 04 were pulled into Threshold's gravity well, or its moon Basis, and destroyed.[10][11][12] In the skirmish over Threshold after the ring's destruction, Cortana was able to jump into slipspace with the Covenant Ruma-pattern light carrier Ascendant Justice while in Threshold's atmosphere.[13]

During the battle, the Covenant dispatched an artifact retrieval group led by Sesa 'Refumee to one of the gas mining platforms in Threshold's atmosphere.[14] After Halo's destruction, the installation's monitor, 343 Guilty Spark, traveled to the gas mine and edified 'Refumee on the true nature of the Halos. Convinced that the Covenant religion was false, 'Refumee and his troops rebelled against the Prophets and were branded heretics as a result.[15] The newly-appointed Arbiter, Thel 'Vadamee, and a Covenant Special Operations contingent were dispatched to silence the heretics; at the conclusion of the resulting conflict, the gas mine was dropped into Threshold's depths. High Charity and its fleet briefly visited Threshold as well, until they jumped to Installation 05.[16]

At one point in October, the human prison ship Mona Lisa ended up picking up Covenant survivors over Threshold including one infected by the Flood. The Office of Naval Intelligence began experiments with the Flood on the ship before the Flood escaped and the Mona Lisa was destroyed by a nuclear missile fired by UNSC Red Horse. Also in the system at the time was a single Covenant ship apparently left behind to monitor or guard the Halo's remains.[17]

Post-Covenant War[edit]

After the Human-Covenant War, a 500 light-second exclusion zone was established around Threshold, with both Sangheili and human warships patrolling the region as part of the post-war treaty between those species. Uncontrolled Sentinels, volatile Halo fragments, micro-debris, malfunctioning Forerunner artifacts, and the ever-present danger of the Flood made even surreptitious exploration and scavenging too dangerous for most. In 2556, Fireteam Apollo was secretly deployed to the exclusion zone as part of Operation: SHELL GAME.[18] One of Threshold's gas mines is the location of a War Games simulation, a favorite among Spartan fireteam leaders.[1]

Description[edit]

Composition and atmosphere[edit]

A raging storm near a gas mine in Threshold's upper atmosphere.

Threshold is an immense gas giant with a diameter of 214,604 kilometres (133,349 mi), and twelve satellites, several of which are Forerunner installations. Threshold is the largest planet in the Soell system, and the seventh planet in Soell's orbit.[2] Threshold is purplish-orange in color,[19] and contains many rare and valuable gases.[4] Threshold's atmosphere is made up of white ammonia clouds, amber-colored ammonium hydrosulfide clouds, phosphorus compounds, ice crystals and other gases. The clouds are arranged in thin, tendril-like formations and resemble sinuous ribbons.[3] The planet's winds blow at hundreds of kilometers an hour. Threshold is known to have storms frequently rage in its atmosphere similar to the storms that occur on the planet Jupiter.[20][21] The planet has a core of liquid hydrogen.[22]

The pressure inside the gas giant is extremely powerful, and effectively able to crush any object that delves too deep into the planet's atmosphere. Threshold has a powerful magnetosphere that is easily capable of disrupting the magnetic fields of plasma weaponry such as plasma torpedoes. The temperature of the outer atmosphere of Threshold is around three hundred degrees Celsius.[23] Further down, in the planet's denser atmosphere, temperatures reach over seventeen hundred degrees Celsius.[24]

Satellites[edit]

The orbiting Installation 04 and asteroids.

Threshold is orbited by twelve satellites. Threshold's largest natural satellite, is called Basis. The other satellites of Threshold are significantly smaller, but are nonetheless host to various Forerunner facilities.[2] Although none of Threshold's satellites have been extensively surveyed, all but two of them appear to contain Forerunner installations or are entirely artificial. The outposts functions are unknown, but they were likely used to provide maintenance for Installation 04.[1] Several small asteroids also orbit Threshold, near Installation 04.[25]

The most notable of Threshold's orbiting installations was Installation 04, situated at the L1 Lagrange point between Threshold and Basis.[1] Threshold's atmosphere is home to an extensive network of Forerunner gas mining platforms and refinery stations, hanging from a band-like low-orbital suspension grid in the upper atmosphere.[2][7] Although, by the mid-26th century, only a handful of these mines and refineries remain operational.[1] The Forerunner space station designated Deep-Space Anomaly 0198 by the UNSC is also in high orbit over the gas giant.[26]

Trivia[edit]

Main-Superintendent.png Browse more images in this article's gallery page.
  • Threshold is described as purple in the book, Halo: The Flood, though throughout Halo: Combat Evolved and Halo 2, it is only shown as orange. Also, the planet is depicted as being light blue in the motion comic adaptation of The Mona Lisa.[27] This may be caused by the position of the system's sun at different times or the proximity to the gas giant, or may simply be an oversight.
  • In Halo: Combat Evolved, Halo 2 and most other visual media, Threshold's surface texture resembles that of a terrestrial world more than a conventional gas giant. The planet's appearance is revised in Halo 2: Anniversary to more accurately reflect its nature, with its face now covered in latitudinal cloud bands characteristic of gas giants. The same is true with Halo 5: Guardians on the maps Paralax and Truth.
  • In Halo: Combat Evolved, the assault rifle's compass arrow points at the gas giant. This suggests that Threshold's atmosphere contains a large amount of iron particles, or that the assault rifles use a digital compass and that the Alpha Halo happens to be situated so that Threshold is aligned with the rifle's north during the events of the game.
  • Microsoft's Windows 10 operating system is codenamed Threshold, after the planet in the Halo franchise.[28] Threshold joins Project Spartan and Cortana as references to the Halo franchise in the Windows 10 release.

Gallery[edit]

  • Crop of Threshold.

    Crop of Threshold.

  • Alternate view of the gas giant Threshold.

    Alternate view of the gas giant Threshold.

  • Full view of the gas giant Threshold.

    Full view of the gas giant Threshold.

  • The planet Threshold.

    The planet Threshold.

  • Threshold as seen from Installation 04.

    Threshold as seen from Installation 04.

  • A storm near the gas mine of Threshold.

    A storm near the gas mine of Threshold.

  • Threshold at night.

    Threshold at night.

  • Threshold with Installation 04 and John-117's lifepod in the foreground as it descends to the ring; the Milky Way galaxy can be seen in the distance.

    Threshold with Installation 04 and John-117's lifepod in the foreground as it descends to the ring; the Milky Way galaxy can be seen in the distance.

  • The Covenant discover Threshold and Installation 04.

    The Covenant discover Threshold and Installation 04.

  • Threshold as seen on the Halo: Combat Evolved for PC loading screen.

    Threshold as seen on the Halo: Combat Evolved for PC loading screen.

  • A size comparison between Threshold and several other celestial objects.

    A size comparison between Threshold and several other celestial objects.

  • Threshold with the remnants of the destroyed Installation 04 and the Covenant fleet in orbit.

    Threshold with the remnants of the destroyed Installation 04 and the Covenant fleet in orbit.

  • Threshold in Halo 5: Guardians.

    Threshold in Halo 5: Guardians.

  • Threshold hologram in Halo 5: Guardians.

    Threshold hologram in Halo 5: Guardians.

List of appearances[edit]

Sources[edit]

  1. ^ a b c d e f g h i j k Halo Waypoint: Threshold
  2. ^ a b c d e f g h Halo: The Essential Visual Guide, page 195
  3. ^ a b Halo: First Strike, page 79
  4. ^ a b c d Halo Encyclopedia (2009 edition), page 310 (2011)
  5. ^ Halo Channel: Encyclopedia
  6. ^ a b Halo: Combat Evolved: Sybex Official Strategies & Secrets, page 63
  7. ^ a b Halo Waypoint: Threshold Gas Mine
  8. ^ Halo 2, campaign level The Oracle
  9. ^ Halo: Combat Evolved, campaign level The Maw
  10. ^ Halo: Evolutions, "The Mona Lisa", page 232
  11. ^ Halo 2, multiplayer map Burial Mounds
  12. ^ Halo Waypoint: Alpha Shard
  13. ^ Halo: First Strike, page 114 (2010)
  14. ^ Halo Encyclopedia: The Definitive Guide to the Halo Universe, page 243
  15. ^ Halo: Combat Evolved Anniversary, Terminal 11
  16. ^ Halo 2, campaign level The Arbiter
  17. ^ Halo: Evolutions, "The Mona Lisa", page ???
  18. ^ Halo Legendary Crate, Data Drop #3
  19. ^ Halo: The Flood, page 12 (2010)
  20. ^ Halo 2, campaign levels The Arbiter and The Oracle
  21. ^ Halo: Evolutions, "The Mona Lisa", page 239
  22. ^ Halo 2, campaign level The Oracle (343 Guilty Spark: "The Flood will not survive once this mine enters the planet's liquid hydrogen core. Then again, neither will we. What a pity...")
  23. ^ Halo: First Strike, pages 101-102 (2010)
  24. ^ Halo: First Strike, page 107 (2010)
  25. ^ Halo: Combat Evolved Anniversary, Terminal 7
  26. ^ Halo: Combat Evolved, multiplayer map Derelict
  27. ^ YouTube: SDCC: Halo Universe Panel (Part 5)
  28. ^ ZDNet: Microsoft codename Threshold: The next major Windows wave takes shape
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