I wonder if arrays of mirrors (aimed at a heat engine or whatever they use to generate electricity from molten salt) That seems like a great idea. Find a nice

I wonder if arrays of mirrors (aimed at a heat engine or whatever they use to generate electricity from molten salt) That seems like a great idea. Find a nice big crater in an area that gets a lot of sunlight and polish the walls of the crater into a parabolic mirror. Put your heat engine at the focus and collect tons of energy. The one drawback: how do you provide cooling? Heat engines are only efficient with a large temperature gradient (Carnot's theorem).