Glossary term: 大氣層
Description: 大氣層是圍繞天體的一層氣體，它由天體的引力維持，因此在表面處最為稠密，而在高空逐漸與星際空間融合。
對於具有固態或液態表面的行星，大氣層的下邊界是明確的。然而，恆星因為其內部是氣態的，所以沒有明確的大氣層下邊界。恆星大氣通常指的是恆星的外層氣態區域，光線從恆星內部穿過這一層進入太空。
行星的磁場可以保護其大氣層不被太陽風或恆星風迅速吹散。以地球為例，磁場不僅保護大氣層，還保護所有生物免受太陽風和宇宙射線的有害影響，從而避免基因損傷。
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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
The OAE Multilingual Glossary is a project of the IAU Office of Astronomy for Education (OAE) in collaboration with the IAU Office of Astronomy Outreach (OAO). The terms and definitions were chosen, written and reviewed by a collective effort from the OAE, the OAE Centers and Nodes, the OAE National Astronomy Education Coordinators (NAECs) and other volunteers. You can find a full list of credits here. All glossary terms and their definitions are released under a Creative Commons CC BY-4.0 license and should be credited to "IAU OAE".
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