Musk on twitter: Mars probably had liquid oceans a long time ago, before it cooled. Now, there are vast fields of ice covered by red dust. If we warm up the planet, the oceans will return and the atmosphere will densify, making it possible to extend life to Mars.
And the response from actual scientist
'He's really so stupid and I can't stand it. if you warmed up mars and melted the water, the water would evaporate into space. Mars can't have a habitable atmosphere in its current state bc it has no magnetic field. solar winds strip away everything that isn't stuck to the surface.'
'Terraforming mars is a project he's been obsessed with for years and he knows literally nothing about it. the magnetosphere problem is very basic stuff.'
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