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Glossary term: 内行星

Description: 在太阳系中，内行星有水星、金星、地球和火星。它们的轨道位于小行星带内，所有这些行星都是所谓的类地行星或岩石行星，与巨行星的氢气和氦气大气层相比，它们的大气层很薄。

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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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被许多陨石坑覆盖的水星

水星

Caption: 这张图像是由信使号探测器（英文缩写：MESSENGER，意译为“水星表面、空间环境、环境化学与测距“）获取的水星表面拼接图像的合成图。信使号由美国宇航局于2004年发射，并在2011年至2015年间对水星进行了探索。
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


The planet Venus showing white clouds enshrouding the planet

Venus in visible light

Caption: This picture taken by NASA's Mariner 10 probe shows what the planet Venus looks like when looking at it with naked eyes. Venus is enshrouded inside a thick cloudy atmosphere dominated by carbon dioxide, never revealing its hot surface.
Credit: NASA/JPL-Caltech credit link

License: PD Public Domain icons


The planet Venus' surface with ridges and valleys

Venus' surface

Caption: This image is a computer-aided rendering of the surface of the planet Venus. Since visual light cannot penetrate the thick clouds in Venus' atmosphere, the image was obtained with radio waves. NASA's space probe Megallan, launched in 1989 mapped Venus' surface between 1990 and 1994.
Credit: NASA/JPL credit link

License: PD Public Domain icons


从太空俯瞰地球，海洋和大陆一览无余

阿波罗 17 号观测到的地球

Caption: 1972 年 12 月 7 日，阿波罗 17 号飞船乘员在前往月球途中拍摄的地球全景，距离约 29000 公里（18000 英里）。图中显示了非洲、南极洲和阿拉伯半岛。
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


火星表面呈铁锈红色，有火山、山谷、陨石坑、冰云和白色极冠

火星

Caption: 这张由美国宇航局火星勘测轨道飞行器于 1999 年拍摄的火星图像显示了火星干燥的表面。这张照片展示了火星上最壮观的地质区域。除了深邃的马林里斯谷之外，我们还看到了四座火山。其中三座形成了塔西斯山脊，而奥林帕斯火山则是我们迄今为止在太阳系中发现的最大的火山。冰云覆盖了火星表面的部分区域。
Credit: 美国宇航局/JPL/MSSS credit link

License: PD Public Domain icons

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