Glossary term: 氣態巨行星
Description: 氣態巨行星是指主要由氫和氦組成的巨行星，這兩種元素在星際和行星際空間中都是氣態的，因此得名“氣態巨行星"。然而實際上，氣態巨行星中大部分的氫和氦是液態的。
氣態巨行星被認為具有岩石內核，其周圍是厚厚的氫和氦層。在行星最深處，這些氣體被壓縮成液態，最深層被認為有一片金屬氫的海洋。在外層，氫和氦呈氣態。大氣中的其他元素會形成雲和雨。在最冷的氣態巨行星中，上層的雲可能由水或氨蒸氣組成。在溫度較低的氣態巨行星更深、更熱的層中，以及在溫度較高的氣態巨行星的外層，雲可以由室溫下固態的鐵和礦物組成。
太陽系中最大的兩顆行星--木星和土星都是氣態巨行星。
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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
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Credit: Ralf Burkart/IAU OAE
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木星
Credit: 美國國家航空航天局、歐空局和 A. Simon（戈達德太空飛行中心） credit link
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土星
Credit: 美國國家航空航天局、歐空局、A. Simon（戈達德太空飛行中心）和 M.H. Wong（加州大學伯克利分校） credit link
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