Glossary term: 宇宙射線
Description: 宇宙射線是在宇宙中運動的高能帶電粒子（如質子、重元素核和電子）。
宇宙射線可以進入地球大氣層。原生宇宙射線可能來自太陽、太陽系、銀河系或遙遠的星系。它們由質子（約占 90%）、氦核（約占 9%）、更重的原子核和電子（約占 1%）以及極少量的反物質組成。來自宇宙的電磁輻射不是宇宙射線。
如果高能宇宙射線進入地球大氣層，它會與大氣粒子相互作用，產生大量的二級帶電粒子，稱為二級宇宙射線。能量最高的宇宙射線是核粒子，其動能相當於一個時速約 150 公裡的網球。不過，這種能量最高的粒子很少見，大多數能量較低。
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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
This is an automated transliteration of the simplified Chinese translation of this term
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