Terraforming on Mars. Computer artwork of the Valles Marineris canyon on Mars after the planet has been made habitable. The breathable air and hospitable climate have led to flourishing plant and animal life. A futuristic airship floats in the air. 'Terraforming' is the name given to the process of making barren planets habitable. Terraforming would involve changing Mars' atmosphere to make it breathable, adding fertilising chemicals to the soil and releasing water ice from below the surface. Terraforming is technically feasible but would be enormously expensive and take many centuries.

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