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An asteroid was a chunk of rock in space, large compared to many things such as flora and fauna[which?] but small compared to planets and stars. They were similar to, but not to be confused with, comets, planetoids and dwarf planets,[source needed] and were usually located in asteroid belts. (TV: The Invisible Enemy) Once an asteroid entered the Earth's atmosphere, it became a meteor. (TV: Detained)
Asteroid impacts Edit
Sufficiently large asteroids could create massive amounts of damage when they hit a planet, causing mass extinctions and societal collapse. Wherever they landed, all the surroundings would be incinerated within seconds. The impact would kick up a cloud of dust which could cover the planet and cause an "Impact Winter" for months or years. Burning debris and acid would happen. Following the "Impact Winter" was the "Ultraviolet Spring", which would cause mutations and cancer. (AUDIO: Blood of the Daleks)
As recounted by K9 Mark 2, the civilisation on the planet Ceres was wiped out by an asteroid, the approach of which they were oblivious to notice due to the symbiotic, two-class Master/Scribe system, which was created with the substance cerulium. (TV: Sirens of Ceres)
Liveable asteroids Edit
While many asteroids were barren and lifeless, some supported life, either naturally or due to design.
A wide variety of buildings and structures were built into asteroids, including the Bi-Al Foundation, (TV: The Invisible Enemy) Braxiatel Collection, (PROSE: Tears of the Oracle) the Delirium Archive, (TV: The Time of Angels) Demon's Run, (TV: A Good Man Goes to War) Lavonia, (AUDIO: Fear of the Daleks) the Shadow Proclamation headquarters (TV: The Stolen Earth) and the Stormlight House. (COMIC: Mortal Beloved) Other asteroids were centres of trade, such as one on which the rare metal Bazoolium was sold. (TV: Army of Ghosts) They generally needed special features to bring the gravity to acceptable levels. (PROSE: Tears of the Oracle)
Usage of asteroids Edit
Other references Edit
Upon taking Rose Tyler to see the Earth's destruction in the year five billion, the Ninth Doctor mentioned asteroids as one of the things humanity thought would cause their extinction. (TV: The End of the World)