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Old 01-03-19, 09:22 PM
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DrIsotope
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My guess would be UV exposure-- and them cosmic rays. No magnetosphere, so the martian surface gets absolutely blasted by radiation. The outer surface of the current rover looks like it has definitely seen some... stuff. Epoxy doesn't much like the sun-- just ask the 15-year-old CF hood on my car. And it spent all 15 years in the Earth's atmosphere, getting washed and waxed regularly.
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