Sol

From Lexicanum

Sol is the Terran or Solar system, named for its sun, and is part of the Segmentum Solar. Its planets include Holy Terra and Mars. There are nine planets in the Sol system:

• Mercury
• Venus
• Terra (Earth)
• Mars
• Jupiter
• Saturn
• Uranus
• Neptune
• Pluto

There are also many moons: Luna is Terra's single moon; Titan has the Grey Knights Space Marine Chapter based on it.