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Terraforming's more aggressive, hands-on cousin. It's the deliberate, large-scale modification of a planetary body's geology, atmosphere, hydrology, and magnetosphere to achieve a desired state—whether that's making a Mars-like world habitable, cooling a Venusian greenhouse, or even dismantling a gas giant to use its raw materials. Tools include orbital mirrors, genetically engineered extremophile seeding, directed comet impacts, and core-stimulation to reactivate magnetic fields. It's planetary-scale civil engineering with a millennia-long project timeline.
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