Editing Substance

{{Status|Canon}}
{{Planet infobox
|name=Substance
|image=[[File:Coelest.jpg|265px]]<br>Substance and [[Installation 05]]. Distances are not to scale.
|system=[[Coelest system]]{{Ref/Reuse|evg}}{{Ref/Reuse|Id=Enc22P346|Enc22|Page=346}}
|body=[[Coelest]]{{Ref/Reuse|evg}}
|position=Fourth planet{{Ref/Reuse|evg}}
|moon(s)=[[Opusculus]]<ref>'''[[Halo: The Essential Visual Guide]]''', ''page 46''</ref>{{Ref/Reuse|Enc22P346}}
|diameter={{Convert|82749|km|mi|sp=us}}{{Ref/Reuse|evg}}
|gravity=
|daylength=
|yearlength=
|atmosphere=;Gas: [[hydrogen]], [[helium]], [[methane]]{{Ref/Reuse|evg}}
;Liquid: [[ammonia]], [[water]]{{Ref/Reuse|evg}}
|temperature=
|demonym=
|species=
|population=
|colonized=
|government=
}}

'''Substance''', also referred to as '''Coelest IV'''<ref name="lootcrate8">'''[[Halo Legendary Crate]]''', ''[[Halo Legendary Crate/Data Drops|Data Drop #8]]''</ref>, is a blue-white ice giant in the [[Coelest system]].{{Ref/Reuse|Enc22P346}}{{Ref/Reuse|evg}} It is the fourth planet in the system and is the planet which [[Installation 05]] orbits.<ref name="evg">'''Halo: The Essential Visual Guide''', ''page 190''</ref>{{Ref/Reuse|Enc22P346}} Substance is orbited by eight satellites, only one of which, [[Opusculus]], is a natural [[moon]]. The rest include Installation 05, and six dormant [[Forerunner]] facilities on predetermined orbital paths.{{Ref/Reuse|Enc22P346}}{{Ref/Reuse|evg}} An [[asteroid]] field is located close to Substance at 2.4 AU from Coelest.<ref>'''[[Halo: Ghosts of Onyx]]''', ''page 189''</ref>

Unlike on [[Installation 04]], where its parent planet [[Threshold]] could be seen quite clearly, especially at night,<ref>'''[[Halo: Combat Evolved]]''', campaign level ''[[The Truth and Reconciliation]]''</ref> on Installation 05, Substance is very difficult to see in the sky of Installation 05. In fact, in none of the locations on this ring seen by [[United Nations Space Command|UNSC]] forces (namely the [[Control Room (Installation 05)|Control Room]], the [[Library]], and various ruined structures) can the planet be seen. This is due to the Delta Halo's stormy weather conditions caused by a [[Flood]] outbreak that occurred some two centuries before the [[Battle of Installation 05]].{{Ref/Reuse|evg}} During the [[Great Schism]] that began on Installation 05, [[Sangheili]] and [[Jiralhanae]] vessels battled each other over Substance.<ref>'''Halo: Ghosts of Onyx''', ''page 199''</ref>

Weeks after the battle and the subsequent [[Fall of High Charity]], the {{UNSCShip|Coral Sea}} picked up [[Alo Sebukah|a dying San'Shyuum]] aboard a skiff drifting in a debris field irregularly orbiting Substance.<ref name="lootcrate8">'''[[Halo Legendary Crate]]''', ''[[Halo Legendary Crate/Data Drops|Data Drop #8]]''</ref>

==Trivia==
*While not named during ''Halo 2'', the file containing the planet's graphics were found to be named "Substance". Similarly, there was a file called "[[Threshold]] and [[Basis]]" in ''[[Halo: Combat Evolved]]''.<ref>[http://forums.bungie.org/halo/archive24.pl?read=700986 '''halo.bungie.org''': ''Re: Halo Wikipedia entry improvement questions'']</ref> The planet was first officially identified in ''[[Halo: The Essential Visual Guide]]''.
*The ''[[Halo Encyclopedia (2009 edition)]]'' incorrectly states that [[Installation 04]] orbits Substance. This error was not corrected in the 2011 edition.<ref>'''[[Halo Encyclopedia (2009 edition)]]''', ''page 185''</ref>

==Gallery==
<gallery>
File:H2A - DeltaHalo.jpg|Substance and [[Installation 05]].
File:H2A - In Amber Clad approaches Halo.png|{{UNSCShip|In Amber Clad}} approaches Substance and Installation 05.
File:H2A - Great Schism.jpg|[[High Charity]] over Substance.
File:H2A - Battle of Delta Halo.jpg|Installation 05's firing sequence being canceled over the planet.
File:H2A-Substance From Delta Halo.png|Substance seen from the surface of Installation 05.
</gallery>

==List of appearances==
*''[[Halo 2]]'' {{1st}}
*''[[Halo: Ghosts of Onyx]]''
*''[[Halo: Broken Circle]]''
*''[[Halo 2: Anniversary]]''
*''[[Halo Mythos]]'' {{Mo}}

==Sources==
{{Ref/Sources}}

[[Category:Planets]]