Terraforming a very cold planet?
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One of the solution to make a cold planet habitable for us is to increase the greenhouse effect. It works with planets like Mars that are inside the habitable zone but would it be enough for a planet outside of that zone?
It does maximize the heat absorption of the planet but there is a limit to this. We can't increase the gas concentrations too much.
Are there other ways we could heat a cold planet to make it habitable?
For example: In Star Wars, the city-planet-capital Coruscant is heated by mirrors that are deflecting the light of the star toward the planet.
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