Glossary term: 大气层
Description: 大气层是围绕天体的一层气体，它由天体的引力维持，因此在表面处最为稠密，而在高空逐渐与星际空间融合。
对于具有固态或液态表面的行星，大气层的下边界是明确的。然而，恒星因为其内部是气态的，所以没有明确的大气层下边界。恒星大气通常指的是恒星的外层气态区域，光线从恒星内部穿过这一层进入太空。
行星的磁场可以保护其大气层不被太阳风或恒星风迅速吹散。以地球为例，磁场不仅保护大气层，还保护所有生物免受太阳风和宇宙射线的有害影响，从而避免基因损伤。
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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
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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