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A light-year was a unit of measurement used to measure interstellar distance. It was quantified as the distance that light travelled in a vacuum over the course of an Earth year. 100 light-years made up a light-century. (TV: The Ribos Operation)

Known distances Edit

From Earth Edit

Planet XXX was 9.2 light years from Earth. (AUDIO: Through the Ruins)

Epsilon Eridani was "about 11 light-years or so" from Earth. (COMIC: Is Anyone There?)

A colony planet visited by the Twelfth Doctor and Bill was 20 light-years from Earth. (TV: Smile)

Vega 3 was 27 light-years from Earth. (PROSE: K9 and the Beasts of Vega)

Arcturus was 40 light-years from Earth. (PROSE: Only a Matter of Time)

Aldebaran II was 68 light-years from Earth. (AUDIO: The Paradise of Death)

Halcyon was 90 light-years from Earth. (AUDIO: The Resurrection of Mars)

Sunday was 100 light-years from Earth. (PROSE: Wetworld)

Beta Caprisis was 100 light-years from Earth. (PROSE: Sanctuary)

In 1873, Mondas was 200 light-years from Earth. (AUDIO: The Silver Turk)

Lucifer was 280 light-years from Earth. (PROSE: Lucifer Rising)

Bellatrix was 324 light-years from Earth. (PROSE: Nightshade)

Gger was 500 light-years from Earth. (PROSE: Listen - The Stars)

Crimson Heart was 10,000 light-years from Earth. (TV: Death of the Doctor)

The Orpheus constellation was 10,000 light-years from Earth. (TV: Aeolian)

According to one account, Gallifrey was 30,000 light-years from Earth. (PROSE: The Devil Goblins from Neptune)

The homeworld of the Uvodni, located in the Spiral Cluster of the Dragon Nebula, was 34,000 light-years from Earth. (TV: Warriors of Kudlak)

New Earth was 50,000 light-years from Earth. (TV: Gridlock)

Vandos was 60,000 light-years from Earth. (COMIC: Mr Nobody)

Dæmos was 60,000 light-years from Earth. (TV: The Dæmons)

Galaxy Seven was 290,000 light-years from Earth. (PROSE: The Eyeless)

Surobos was 420,000 light-years from Earth. (COMIC: Shipwreck!)

Gorgos was 100,000,000 light-years from Earth. (TV: Eye of the Gorgon)

According to the Eighth Doctor, Gallifrey was 250,000,000 light-years from Earth. (TV: Doctor Who)

According to the Eleventh Doctor, Apalapucia was 2,000,000,000 light-years from Earth. (TV: The Girl Who Waited)

According to the First Doctor, Destination was billions of light-years away from Earth. (AUDIO: The Destination Wars)

From other locations Edit

The Ao constellation and Qqaba were 9.6 light-years from Gallifrey. (PROSE: Lungbarrow)

Ribos was 300 light-years from the Magellanic Clouds. (TV: The Ribos Operation)

The Twelfth Cyber Legion was 20,000 light-years from Demons Run. (TV: A Good Man Goes to War)

Safeplace was about 32,000 light-years from Mars. (AUDIO: The Judgement of Isskar)

The First Doctor encountered a group of Watermen 5 million light-years from Q20. (COMIC: Dr. Who Meets the Watermen)

The Second Doctor once dematerialised the TARDIS while it was 4 quadrillion light-years from the nearest galaxy. (PROSE: When Starlight Grows Cold)

Katura was 3.62 light-years from Mars. (AUDIO: Judoon in Chains)

Known measurements Edit

The Mutter's Spiral galaxy was around 100,000 light-years in diameter. (PROSE: The Eyeless)

The Morestran empire spanned 80,000,000 light-years. (PROSE: Zeta Major)

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