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Glossary term: 矮行星

Description: 矮行星是一種天體,具備以下特徵:它圍繞太陽運行,質量足夠大,形成近似球形,但沒有清除其軌道附近的其他物體,並且不是衛星。矮行星通常在類似天體密集的區域運行,例如小行星帶和柯伊伯帶。一般來說,矮行星比水星小,具有冰和岩石構成的結構。它們內部冰的含量與岩石的比例取決於它們在太陽系中的位置。冥王星是最著名的矮行星。需要注意的是,矮行星這個術語與已廢棄的“微型行星”不應混淆。

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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

This is an automated transliteration of the simplified Chinese translation of this term

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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Image of Pluto in enhanced colour to bring out differences in surface composition. They include craters, ridges and plains.

Pluto

Caption: NASA's New Horizons spacecraft captured this high-resolution enhanced colour view of the dwarf planet Pluto on in July 2015. The image combines blue, red and infrared images taken by the Ralph/Multispectral Visual Imaging Camera (MVIC). Pluto’s surface appears enhanced in this view to a rainbow of pale blues, yellows, oranges, and deep reds. The image resolves details and colours on scales as small as 1.3 kilometers.
Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute credit link

License: PD Public Domain icons


小行星穀神星大致呈球形,表面呈灰色,布滿隕石坑,其中一些隕石坑暴露出白色的地下水冰。

穀神星

Caption: 這是一張由“黎明號”探測器在2015年5月在13641公裡的距離拍攝的小行星穀神星的真彩色圖像。右側醒目的明亮隕石坑是豪拉尼(Haulani)隕石坑,其左側較小的亮點位於奧克索(Oxo)隕石坑的底部。來自這些撞擊的噴出物似乎暴露出明亮的物質,可能是水冰。
Credit: NASA / JPL-Caltech / UCLA / MPS / DLR / IDA / Justin Cowart

License: CC-BY-2.0 Creative Commons Attribution 2.0 Generic icons