Glossary term: 宇宙射线
Description: 宇宙射线是在宇宙中运动的高能带电粒子（如质子、重元素核和电子）。
宇宙射线可以进入地球大气层。原生宇宙射线可能来自太阳、太阳系、银河系或遥远的星系。它们由质子（约占 90%）、氦核（约占 9%）、更重的原子核和电子（约占 1%）以及极少量的反物质组成。来自宇宙的电磁辐射不是宇宙射线。
如果高能宇宙射线进入地球大气层，它会与大气粒子相互作用，产生大量的二级带电粒子，称为二级宇宙射线。能量最高的宇宙射线是核粒子，其动能相当于一个时速约 150 公里的网球。不过，这种能量最高的粒子很少见，大多数能量较低。
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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher The translation of this term and its definition is still awaiting approval
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