What if there’s Oil on Mars?

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Somebody joked recently that if Mars only had oil deposits, we’d already have cities there. Commentary on how we only ever do ambitious things if there’s profit in it of course, but it got me thinking. What if Mars actually does have oil on it?

If there was ever life on Mars, even just algae and microbes in its oceans, their death and decay would have left behind a substantial quantity of oil deep underground…