Sol system

The Sol system, otherwise referred to by UNSC personnel and humans alike as the Solar System, is the home star system for humans. The system's G-class star is named Sol, hence the system's name.

Major planets and moons

• Mercury
• Venus
• Earth - The UNSC headquarters/human homeworld.
  • Luna- Where the Luna OCS Academy is located
• Mars - A major site of the Interplanetary War and later during the Human-Covenant War it was the site of the Battle of Mare Erythraeum. Has been terraformed to have an Earth-like climate.
• Jupiter - A gas giant, Jupiter is the largest planet in the Sol System.
  • Io - The site of a UNSC listening post. On October 20, 2552, the listening post on Io detects 15 Covenant ships inbound under the command of the Prophet of Regret.
  • Europa - It contains a UNSC base and a substantial colony. Spartans Linda-058 and William-043 were once assigned to a mission on this satellite.
  • Callisto - The Second Largest Jovian Moon. The site of the signing of the Callisto Treaty and a number of UNSC bases.
  • Ganymede - The EVA Armor was developed here, home to a number of colonists.
• Saturn - A gas giant known for its clearly visible surrounding rings, unlike the other gas giants whose rings are rather dim. Saturn is the second largest planet in the Sol System. Its practical uses to the UNSC are limited, and therefore it is mostly just a tourist destination.
• Uranus - An icy gas giant about twice as far away as Saturn from Sol. Its distance from Sol makes it of little use to the UNSC.
• Neptune - Furthest away from Sol, it is another icy gas giant similar to Uranus.

Dwarf planets

• Ceres - The largest asteroid to have ever been discovered by humanity.
• Eris - Currently the largest Dwarf Planet known. It is almost 10% larger than Pluto in diameter.
• Pluto - In the 1930's, Pluto was discovered to be a planet, and subsequently named. Many years later in 2006, scientists debated over if it was really big enough to actually be considered a planet, and gained some ground in the fact that it had a moon, Charon, but after much talk, it was declassified. The Pluto Slipstream Monitoring Station Democritus is stationed in orbit around it. On November 3, 2552, the Monitoring Station detected Cortana's signal in Slipspace with Dr. Halsey's message to Lord Hood. Pluto has three moons: Nix, Hydra, and Charon.
• Haumea - The most notable feature is its highly elliptical shape.
• Makemake - The second most distant dwarf planet, its lack of moons mean it and Ceres are the only two known dwarf planets orbiting Sol without moons.

Trivia

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.

List of appearances

Halo: The Fall of Reach Template:First mentioned Halo: Combat Evolved Halo: Combat Evolved Anniversary Terminals Halo: First Strike (First appearance) i love bees Halo 2 Halo Graphic Novel Halo: Ghosts of Onyx Iris Halo 3: The Cradle of Life Halo: Landfall Halo: Combat Halo: Last One Standing Halo: Uprising Halo 3

Halo: Contact Harvest Halo: The Cole Protocol Halo Wars (Mentioned only) Halo 3: ODST Halo Legends Origins Halo: Evolutions - Essential Tales of the Halo Universe Midnight in the Heart of Midlothian Palace Hotel The Impossible Life and the Possible Death of Preston J. Cole Halo: Glasslands Halo: Cryptum Halo: The Thursday War Halo 4 Spartan Ops Halo: Silentium