Mutter's Spiral

Mutter's Spiral was the Time Lord designation for the galaxy in which the Sol system was located. (MA: The Man in the Velvet Mask, NA: Human Nature, EDA: Alien Bodies) Humans knew Mutter's Spiral as the Milky Way or as Adric referred to it, Galaxia Kyklos. By the time of Sabalom Glitz it also went by the name of the Stellian Galaxy. (DW: The Mysterious Planet)

Mutter's Spiral was approximately 100,000 light-years in diameter. Its nearest significant neighbouring galaxy was the Andromeda Galaxy. It was also surrounded by several nearby minor satellite galaxies, such as Galaxy Seven). (NSA: The Eyeless)

The Doctor frequented Earth, a planet in Mutter's Spiral. (DW: An Unearthly Child, et al.) On one occasion, Earth was moved out of the galaxy by the Daleks. (DW: The Stolen Earth)

Galactic Trends

 * Oseidon had the highest radiation level in the galaxy. (DW: The Android Invasion)
 * Binary vascular systems were not common in sentient species. (NA: Tragedy Day)
 * The Tenth Doctor claimed Humans were the only species in the galaxy to invent edible ball bearings. (DW: Fear Her)
 * There were no metamorphic insectoids in the Galactic vector containing the Mutter's Spiral. (DW: The Unicorn and the Wasp)

Planets and Star Systems

 * See star systems, stars and planets.

The Mutter's Spiral had around 150 billion stars. (BFA: The Apocalypse Element)

Politics

 * See Galactic law.

There were several forms of galactic government. The Galactic Alliance was one governing body. (SJA: From Raxacoricofallapatorius With Love) It was also under the domain of the Shadow Proclamation. (DW: The Stolen Earth)