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The Terrans had been using terraformer machines in order to make planets habitable, and when no longer needed these were often abandoned and left to float through space.
In time, the programming became corrupted and turned on their creators, they were led into commonwealth space and the Terran gate was destroyed. They have since evolved into the Xenon.
Some terraformers existed in isolation and developed independently, such as the terraformer found recently in Aldrin and another in a trackless Unknown Sector
Terraformers are a form of AGI and are currently banned from development.