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Glossary term: 冥王星

Description: 冥王星是太阳系中的天体之一。它位于柯伊伯带,在海王星轨道之外。它曾被称为太阳系第九大行星,但在 2006 年被重新归类为矮行星。它于 1930 年被克莱德-汤博发现。冥王星与太阳的平均距离为 60 亿千米,半径为 1185 千米(比地球的卫星还小)。冥王星上的一年相当于地球上的 247.9 年,一天相当于地球上的 6.4 天。

2015年,美国国家航空航天局的 "新视野 "号飞船成为第一个飞越冥王星的航天器,并首次提供了冥王星表面及其大气层的详细信息。冥王星表面非常寒冷,几乎没有氢可以以气态形式存在。冥王星仅有的一点大气主要是氮气,表面有大片冰冻的氮气平原。它的大气层延伸到1600千米的距离。冥王星由岩石(70%)和冰(30%)组成。它有五颗已知的卫星:卡戎(Charon)、斯提克斯(Styx)、尼克斯(Nix)、刻耳柏洛斯(Kerberos)和海德拉(Hydra)。

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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
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Related Media


冥王星的增强彩色图像,用于突出表面成分的差异。这些特征包括陨石坑、山脊和平原。

冥王星

Caption: 美国宇航局的 "新视野" 号航天器于 2015 年 7 月拍摄到了这张矮行星冥王星的高分辨率增强彩色图像。该图像结合了拉尔夫/多光谱视觉成像相机(MVIC)拍摄的蓝色、红色和红外线图像。在这张照片中,冥王星的表面呈现出淡蓝色、黄色、橙色和深红色的彩虹般色调。该图像可以分辨出小至 1.3 公里范围内的细节和色彩。
Credit: 美国宇航局/约翰霍普金斯大学应用物理实验室/西南研究所 credit link

License: PD Public Domain icons

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Children's Planetary Maps: Pluto & Charon

Children's Planetary Maps: Pluto & Charon

astroEDU educational activity (links to astroEDU website)
Description: Learn about our furthest neighbors

License: CC-BY-4.0 Creative Commons 署名 4.0 国际 (CC BY 4.0) icons
Tags: Maps , Planetary cartography , Spatial thinking , Charon
Age Ranges: 6-8 , 8-10 , 10-12 , 12-14
Education Level: Middle School , Primary , Secondary
Areas of Learning: Social Research
Costs: Low Cost
Duration: 2 hours
Group Size: Group
Skills: Analysing and interpreting data , Asking questions , Communicating information , Constructing explanations , Developing and using models , Engaging in argument from evidence , Planning and carrying out investigations