I am having trouble reconciling the grandness of the golden age with the sight of all those rusted out cars near the cosmodrome that look to have had rubber tires and combustion engines. Presumably they had something at least as good as sparrows or pikes before the fall. Guardians, I don't think we are being told the whole truth here.
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Perhaps the "Golden Age" was today. And the technology we have in Destiny isn't even remotely close to human tech?