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Glossary term: 冰雪巨人

Description: 在太陽系中有四顆巨行星：木星、土星、天王星和海王星。後兩顆行星，即天王星和海王星，被稱為冰巨行星。它們擁有堅固的岩石核心，外圍則被厚厚的一層水、氨和甲烷包圍。這些化學物質處於一種奇特的高壓狀態，既不是完全固態，也不是完全液態。兩顆行星的外層大氣是由氫和氦組成的厚重氣層。

在早期太陽系中，遠離太陽的區域溫度足夠低，水、甲烷和氨能夠凍結成“冰”。這裡的“冰”是一個廣義術語，指的是由分子組成的凍結化學物質。年輕的天王星和海王星由於引力吸積了這些冰。這些冰是兩顆行星的重要組成部分，因此它們被稱為冰巨行星。

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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

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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