Mutter's Spiral

Mutter's Spiral was the Time Lord designation for the galaxy in which the Sol system was located. (DW: The Deadly Assassin, et. al.) Humans knew Mutter's Spiral as the Milky Way or as Adric referred to it, Galaxia Kyklos. (DW: Four to Doomsday) 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 a hundred thousand 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) and the two dwarf galaxies the Larger Magallenic Cloud and Smaller Magallenic Cloud (AG: The Last Voyage).

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)
Tivoli was the most conquered planet in this galaxy, leading to its inhabitants (like Gibbis) to welcome invasion and subjugation. (DW: The God Complex) Other sources claimed that Earth was the most invaded, not only in the Mutter's Spiral but in four more galaxies. (NSA: Borrowed Time)
Xaos was said to be the oldest planet in the galaxy. (DWM: The Warrior's Story)

See star systems, stars and planets.

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

Mutter's Spiral was divided into four quadrants. In the Third Quadrant there were at least eight thousand twenty-three sectors, with Sector 8023 containing Earth. (DW: Logopolis) Another sector was the Kappa Galanga sector, which contained the Lasron solar region. (NSA: Prisoner of the Daleks) There were several galactic arms, including the Perseus arm where Mogar was located, (DW: Terror of the Vervoids) a western arm (DWM: Between the Wars: A Slow Night in Paradise) and a secondary and tertiary arm (MA: Burning Heart).

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 dominion of the Shadow Proclamation. (DW: The Stolen Earth)