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From SCIFIPEDIA
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To Terraform a planet (or moon) is to make it Earth-like through the use of technology, usually so it can be inhabited by Earthlings. The process might include: altering an atmosphere by the addition or subtraction of elements; adding water to an arid planet; adding plants to a lifeless planet; and so on.
Carl Sagan proposed the terraforming of Venus in 1961. While theoretically possible in the real world, it has been done many times in Sci Fi works.
A planet must first meet some basic requirements before being suitable for terraforming and by extension, human habitation. It must be located in a suitable star system within the habitable zone. It must have a suitable mass and density, and the ability to maintain an atmosphere and must meet several other . . .
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