Basis HCE

Basis is the largest of the 12 moons orbiting the gas giant planet Threshold in the Soell system.[1] Its diameter is 23,848 km (14,818 miles),[2] almost double that of Earth, but with the same surface gravity. Installation 04 was positioned in the L1 Lagrange point between Basis and Threshold.[1] After Installation 04's destruction, the Covenant Heretics built a makeshift camp on Basis amid its wreckage.[3]

The atmosphere of the moon produces a twilight appearance, with hazy clouds and an orange skyline.



The surface of Basis.

  • On Burial Mounds, you can see wreckage from Installation 04 falling into the atmosphere and burning up.
  • The Arbiter was originally meant to take place on Basis instead of the Gas Mine on Threshold.
  • In the first cinematic of Halo: Combat Evolved, as the Pillar of Autumn is hit by several Plasma Torpedoes and the camera pivots around the ship, you can catch a glimpse of Basis.
  • In Halo: Combat Evolved, Basis appears as a image of Mars, tinted blue.
  • The blue coloring of Basis when seen from space is puzzling, considering that from the surface it has a hazy orange or rust-colored atmosphere and terrain. However, it is possible that this all from the scoring and burning of Halo's wreckage.



  1. 1.0 1.1 Halo Story Bible: Halo, Halo: Combat Evolved: Sybex Official Strategies & Secrets, chapter 5, page 63
  2. - Halo-verse Planetary Scale
  3. Halo 2 - Burial Mounds

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