Sol system

From Halopedia, the Halo wiki

There is more information available on this subject at Sol system on the English Wikipedia.
Stellar overview


Kuiper Belt[1]

Societal overview

Notable events:



The Sol system, also referred to as the Sol star system, is the home star system of the human species.[2] Earth, the human homeworld, holds the seat of power for both the Unified Earth Government,[3] and the United Nations Space Command.[4]


Planetary system[edit]

  • Mercury (Sol I) - Tiny, barren world.[1]
  • Venus - Failed terraforming project.[5]
  • Earth (Sol III) - The human homeworld,[2] home to the headquarters of the UEG[3] and the UNSC.[4] Also the site of Kupiga Simu, a Sol system communications transmitter.[2]
  • Mars (Sol IV) - Humanity's first colonized planet and terraformed to have an Earth-like climate.[1]
  • Jupiter (Sol V) - A gas giant, and second largest body in the Sol System.[1]
    • Io - Unstable moon with a large colony.[1]
    • Europa - Colonized and terraformed.[1]
    • Callisto - Home to a number of UNSC bases.[1]
    • Ganymede - Largest moon of Jupiter, partially terraformed, and is populated.[1]
  • Saturn (Sol VI) - A gas giant known for its bright surrounding rings. Saturn is the third largest body in the Sol System. Its practical uses to the UNSC are limited, and therefore it is mostly just a tourist destination.[1] Castellaneta, a tourist station, is in geosynchronous orbit on the "sunny side" of the planet's outermost ring.[7]
  • Uranus (Sol VII) - Gas giant with anomalous properties.[1]
  • Neptune (Sol VIII) - Named after the Roman god of the sea. Furthest away from Sol, it is a gas giant that is relatively unexplored.[1]
  • Kuiper Belt
  • Shaw Institute Facility
  • Oort cloud


Ancient history[edit]

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Post-Great Purification[edit]

Humanity first colonized the system's worlds beyond Earth in the late 21st and early 22nd centuries, followed by steady growth of the populations on Earth and the off-world colonies throughout the next two centuries before the launch of the first extrasolar colonization program in 2362, enabled by the development of the Shaw-Fujikawa Translight Engine in 2291.[8]

Attacks on the system[edit]

The first known incursion into the Sol System was on October 10, 2552 by unknown enemies.[9]

On October 20, the Fleet of Sacred Consecration was detected near the moon of Io. Soon after, the Fleet appeared near Earth, commencing the Battle for Earth.[10] Over the next few months, battles on Earth and elsewhere in the system would take place.[9] The Battle of Mare Erythraeum on Mars would take place during this time frame.[11] The UNSC Home Fleet would be utterly devastated by November 17 with the arrival of the Anodyne Spirit and Truth's fleet.[12] One of final skirmishes on Earth would take place on December 3, during Operation: MARSH FLASH.[9]

Despite massive Covenant assault across the Sol system even on Sol colonies' cities,[13] many of the human population centers of Sol colonies, such as Mars, and Luna in the system survived the assault relatively intact,[14] although the majority of Earth habitats has been destroyed.[15] In aftermath of the Battle for Tribute with the loss of over half of the population on Tribute, Earth was unable to afford to spare any immediate assistance with Sol’s colonies that has been left in ruins during the Covenant onslaught on the Sol system.[16]


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Created conflict[edit]

Main article: Created conflict
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  • Sol is the original Latin and the actual scientific name for Earth's sun. This designation and name has actually been used instead of "Solar System" in many science fiction novels.
  • Sol is also an emblem option in Halo 3 and Halo: Reach.


List of appearances[edit]


  1. ^ a b c d e f g h i j k l m Halo Encyclopedia (2009 edition), Locations: The Sol System, p. 282-283 (2009); p. 294-295 (2011 edition)
  2. ^ a b c Halo Waypoint, Universe - Earth (Retrieved on Jun 1, 2020) [archive]
  3. ^ a b Halo Waypoint, Universe - UEG (Retrieved on Jun 1, 2020) [archive]
  4. ^ a b Halo Waypoint, Universe - UNSC (Retrieved on Jun 1, 2020) [archive]
  5. ^ a b c Halo Mythos, The Interplanetary War, p. 50-51
  6. ^ Halo: Reach Limited Edition, Intersystem News, LCDR Miranda Keyes Awarded Silver Star
  7. ^ Halo: New Blood, p. 26-27
  8. ^ Halo Encyclopedia (2009 edition), p. 43-44 (2011)
  9. ^ a b c Halo Legendary Crate - Data Drop #2
  10. ^ Halo 2, campaign level Cairo Station
  11. ^ Halo: Uprising, issue 1
  12. ^ Halo 3, campaign level Crow's Nest
  13. ^ Halo: New Blood, page 101 (Google Play edition)
  14. ^ Halo Waypoint, Universe - Humans (Retrieved on Jun 1, 2020) [archive]
  15. ^ Halo: Uprising, issue 3
  16. ^ Halo Waypoint, Tribute (Retrieved on Jun 1, 2020) [archive]