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  1. Chris says

    @Randy, yes Mars has almost no atmosphere, due in part to its low gravity but also because it doesn’t appear to have currently active volcanoes which renew the Earth’s atmosphere. That plus an absence of a magnetic field indicate the core of Mars has completely cooled and is solid. The above vision could only be achieved by temporarily restoring Mars’ atmosphere and hydrosphere. Several methods have been proposed.
    http://en.wikipedia.org/wiki/Terraforming_of_Mars

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