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Why are mars rovers not designed with a solar panel auto-clean system?
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I would think that even something as simple as having a gimbal with a reserve power source that allows the solar panels to rotate 360 degrees would work.
This would effectively allow the system to dump sand off of the rovers solar panels using a reserve power source when they get too covered to receive light like what happened to the Opportunity rover.
Combine that with a synthetic "soft brush" system that can wipe the panels of finer particulates and it should allow rovers to last longer.
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