Glossary term: 类地行星
Description: 类地行星主要由岩石和铁等物质构成。类地行星没有巨型气体行星上又氢气和氦气构成的蓬松大气层，，而是拥有较小的大气层或根本没有大气层。类地行星的质量通常小于巨行星，体积也较小。
在太阳系中，类地行星有水星、金星、地球和火星。
系外行星天文学的主要研究重点之一是寻找大小和组成类似地球的类地行星，尤其是那些位于其恒星宜居带内的行星。
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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".
Related Media
水星
Credit: 美国国家航空航天局/约翰霍普金斯大学应用物理实验室/华盛顿卡内基研究所 credit link
License: PD Public Domain icons
可见光下的金星
Credit: 美国宇航局/JPL-加州理工学院 credit link
License: PD Public Domain icons
Venus' surface
Credit: NASA/JPL credit link
License: PD Public Domain icons
阿波罗 17 号观测到的地球
Credit: 美国国家航空航天局/阿波罗 17 号机组人员/阿波罗项目档案馆
License: PD Public Domain icons
火星
Credit: 美国宇航局/JPL/MSSS credit link
License: PD Public Domain icons
