Ariel is a Human colony world of the Unified Earth Government.


It was once the site of a Forerunner artifact named The Knowing used to store information.[1]

Human ColonizationEdit

Under human occupation, the planet had two archaeological dig sites and one settlement, with a population of approximately 4000 residents.[1]

In 2532, several SPARTAN-II augumentation chemicals precursors were sent to an ONI Section 3 laboratory on this colony.[2]

Battle of ArielEdit

Main article: Battle of Ariel

During the Human-Covenant war, the Covenant invaded the colony, and one of the civilians managed to send out a distress signal, to which UNSC High Command sent a force of Orbital Drop Shock Troopers from the 105th ODST Division to investigate. The UNSC forces came to notice that the Covenant were not operating in their usual fashion; Glassing of the planet was not their intent, but they were searching for something under the surface instead.[1]


  • Ariel is also the name of the planet Uranus's fourth largest moon.
  • Ariel is also the name of a planet in the television series Firefly, which starred the voice actors for Buck, Dutch and Mickey (being Nathan Fillion, Adam Baldwin and Alan Tudyk, respectively).
  • There is information in Halo Encyclopedia that Spartans wearing MJOLNIR mark IV armor were sighted. Suspiciously, that armor possessed energy shielding, thus it wasn't confirmed by ONI.



  1. 1.0 1.1 1.2 1.3 Halo: Helljumper - Issue One
  2. Halo: Reach Legendary Edition - Bonus Item: Dr. Halsey's personal journal, January 18, 2532
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