هي جسيمات دون ذرية ذات طاقة عالية تتحرك في الفضاء بسرعة تقارب سرعة الضوء، وعند وصولها للغلاف الجوي للأرض ترتطم بالجزيئات في الطبقات العليا، ما ينتج «زخة» من الجسيمات دون الذرية.
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