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Here's a thought experiment to consider. Imagine creating a lens to focus the blackbody radiation from a stack of bricks onto a single brick, and heating up the brick.

Now focus the light back onto just a small region of the brick pile, and heating up that region, which in turn heats the rest of the bricks by conduction.

This in turn increases the amount of heat collected from the pile, ad infinitum or until the brick pile melts.

Short of letting the brick pile melt itself, imagine tapping into the excess heat and using it to power an electric motor for a useful purpose.

The problem is that some of the radiation from the moon is not blackbody radiation.

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