Glossary term: 外行星
Description: 在太陽系中,外行星包括木星、土星、天王星和海王星。它們的軌道都在小行星帶之外,並且所有這些行星都是所謂的巨行星,它們的大氣層非常厚,主要由氫氣構成。這使得它們在物理上與內行星截然不同,內行星都是相對較小的岩質天體,大氣層相對稀薄。
對於太陽以外的恆星,其周圍的行星並不一定分為具有類似特徵的內行星群和外行星群--我們知道有許多恆星的近軌道上至少有一顆氣態巨行星,即 "熱木星"。
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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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