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Large amounts of moondust raining through the atmosphere would convert kinetic energy into heat—potentially heating and even boiling surface waters—while persistent ring shadows and volcanic/meteoric aerosols would reflect sunlight and trigger rapid cooling, so the net climate effect depends on the balance and timing of heating versus sunlight blockage.
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From the falling person's viewpoint, outside clocks appear to speed up because incoming light is blueshifted and arrives in faster sequences as their proper time and distant time run differently.