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Terraform is a term used to describe the artificial altering of a planet's atmosphere and biology to create a world more suitable for human life. The word comes from the latine word Terra meaning Earth.
Examples of Terraforming
The Tenth Doctor used a terraform prototype to tidy up the sky of Earth from ATMOS poison in 2008. (DW: The Poison Sky)
When Mitzi, the first cat to go into hyperspace, went into space, she landed on the planet Photris, which was terraformed. (DWS: The Cat Came Back)
In late 25th century Planet Hollywood was terraformed a consortium of entertainment businesses. (NSA: Peacemaker)
By the 26th century Mars had been completely terraformed by humans to make it habitable. They melted the icecaps and installed a gravity to make an Earth-like planet (albeit with less gravity and more UV light). (NA: GodEngine, BNA: Beige Planet Mars) The Monk tried to help the Ice Warriors revert the changes, but was unsuccessful. (BFA: The Resurrection of Mars)
Before the 40th century, Io was terraformed to be used as the headquarters of the Galactic Federation. (NA: Legacy)
During the Second Great and Bountiful Human Empire, Agelaos was terraformed. (NSA: The Story of Martha: The Weeping)
In the 49th century Alfava Metraxis was terraformed. (DW: The Time of Angels)
The Source was a legendary creation myth for the people on the planet Messaline. The Doctor, Donna Noble, Martha Jones, and the Doctor's daughter Jenny discovered it was a terraforming device. The Doctor released the device to trigger the terraforming of Messaline in 6012. (DW: The Doctor's Daughter)
After Earth and Mars became uninhabitable, Pluto was terraformed by the Usurians. (DW: The Sun Makers)
Shanquis was terraformed using human technology. Even after the humans died out, the terraforming devices could be activated by spoken English. (CC: Bernice Summerfield and the Criminal Code)
Osphogus had been terraformed. It was still inhabitable 5,000 years later. (BFA: The One Doctor)
Similar Processes
Technically, terraforming was the transformation of a planet to a more Earth-like form, but other species had similar processes to adapt planets to a form more like their own homeplanet.
Theoretical Monsters: A Credibility Test referenced the Kalekani, a species who used a terraforming virus that converted land into flat grassland, effectively turning it into a golfcourse. Fitz Kreiner believed they were made up. (EDA: Interference - Book One)
In 1864, the Cei sent a terraforming device to Earth so that it could be used as an outpost. (BBCR: The Runaway Train)
In 1997, the Ice Warriors planned to wipe out the humans and terraform (more specifically, aresform) Earth, but they were unsuccessful. (NA: The Dying Days)
The Cthalctose created a terraforming device, called the Genesis of Cthalctose, which sparked the Agent Yellow crisis in 2003. (NA: Eternity Weeps)
Torchwood Three speculated that the Vandrogonite Visualiser was intended to be used as a terraforming device. (TWN: Pack Animals)
The Ice Warriors attempted to terraform Earth again in the early 21st century using a Martian fungus. (DW: The Seeds of Death)
In the 22nd century, the Daleks terraformed Antalin to resemble Skaro. (EDA: War of the Daleks)
The Daleks were somehow able to terraform Jupiter, turning it from a gas giant to a planet that humans could survive on. (BFDE: Dalek War: Chapter Two, Dalek War: Chapter Three)
Terraforming Technology and Companies
- Geo-forming was like terraforming, but much faster. (BFDE: The Survivors)
- WorldCorp and PlanetScape were both human terraforming companies. (EDA: Dark Progeny)
- Nooma was artificially created to test terraforming technology by the Aapex Corporation. (MA: Speed of Flight)
- A Terran Federation ship carried terraforming equipment. The Sontarans took the ship and planned to use it to create cloning planets. (DWM: Pureblood)
