Editing Threshold

{{Status|Canon}}

|image=[[File:H5G Threshold.png|300px]]

|body=[[Soell]]{{Ref/Reuse|universe}}{{Ref/Reuse|vis}}

|position=Seventh planet{{Ref/Reuse|universe}}{{Ref/Reuse|vis}}

|moon(s)=Twelve, including [[Basis]]{{Ref/Reuse|universe}}

|diameter={{Convert|214604|km|mi|sigfig=7|sp=us}}{{Ref/Reuse|universe}}

[[Hydrogen]], [[helium]], [[methane]]{{Ref/Reuse|universe}}

[[Ammonia]], [[water]],{{Ref/Reuse|vis}} [[Wikipedia:Ammonium hydrosulfide|ammonium hydrosulfide]], [[phosphorus]] compounds<ref name="atmo">'''[[Halo: First Strike]]''', ''page 79''</ref>

|demonym=Thresholdian{{Ref/Reuse|universe}}

|government=*[[Ecumene]]<ref name="ENC310">'''[[Halo Encyclopedia (2009 edition)]]''', ''page 310'' (2011)</ref> {{C|formerly}}

*[[Covenant]]{{Ref/Reuse|ENC310}} {{C|briefly}}

'''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 L₁ [[Lagrange point]] between Threshold and its largest [[natural satellite]], [[Basis]].<ref name="sybex-halo">'''[[Halo: Combat Evolved: Sybex Official Strategies & Secrets]]''', ''page 63''</ref>

Threshold's [[Earth Survey Catalog]] number is '''B1008-AG'''.{{Ref/Reuse|sybex-halo}}

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>

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>

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>

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}}

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>

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 L₁ [[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>

**''[[Terminal (Halo: Combat Evolved Anniversary)|Terminals]]''

**''[[Terminal (Halo 2: Anniversary)|Terminals]]''