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Cosmic rays have been experimentally determined to be able to produce ultra-small aerosol particles,[11] orders of magnitude smaller than cloud condensation nuclei (CCN). Whether this mechanism is relevant to the real atmosphere is unknown; in particular, the steps from this to modulation of cloud formation and thence climate have not been established. The analogy is with the Wilson cloud chamber, however acting on a global scale, where earth's atmosphere acts as the cloud chamber and the cosmic rays catalyze the production of CCN. But unlike a cloud chamber, where the air is carefully purified, the real atmosphere always has many CCN naturally.
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In short, that wikipedia page did nothing to suggest that cosmic rays "eat away" at the atmosphere. Because they can't. What do you even mean by "eat away" anyway? Are you suggesting that being hit by cosmic radiation causes the molecules in the air to break down? Well that doesn't really cause anything to be destroyed (conservation of matter and all that), it just changes a minuscule amount of the particles in the air to be made into lighter elements. Certainly you're not suggesting that cosmic radiation causes our atmosphere to leak off into space?