Glossary term: 气态巨行星
Description: 气态巨行星是指主要由氢和氦组成的巨行星，这两种元素在星际和行星际空间中都是气态的，因此得名“气态巨行星"。然而实际上，气态巨行星中大部分的氢和氦是液态的。
气态巨行星被认为具有岩石内核，其周围是厚厚的氢和氦层。在行星最深处，这些气体被压缩成液态，最深层被认为有一片金属氢的海洋。在外层，氢和氦呈气态。大气中的其他元素会形成云和雨。在最冷的气态巨行星中，上层的云可能由水或氨蒸气组成。在温度较低的气态巨行星更深、更热的层中，以及在温度较高的气态巨行星的外层，云可以由室温下固态的铁和矿物组成。
太阳系中最大的两颗行星--木星和土星都是气态巨行星。
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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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