Glossary term: 恆星
Description: 恆星是由等離子體——與電子分離的原子核——構成的球體。恆星自身的引力將內部的等離子體束縛在一起,而恆星核心區域的核聚變過程產生的內壓阻止了其自身的塌縮。天文學家對物理學術語的使用不太嚴格,通常將“氣體”和“等離子體”互換使用,因此也將恆星稱為氣體球。在恆星的大氣層中,等離子體可能只是部分電離的,甚至包含一些未電離的原子,這取決於恆星的溫度。
離地球最近的恆星是太陽。
在更廣泛的意義上,“恆星”一詞包括核聚變尚未開始的原恆星,以及中子星或白矮星等恆星遺跡。這些恆星遺跡並不是簡單的等離子體球——白矮星在冷卻數十億年後會結晶成一種不同尋常的固體,而中子星則與巨大的原子核非常相似。
無論是用肉眼還是通過光學望遠鏡觀察,恆星都是夜空中最明顯的天體。在宇宙中,恆星通常存在於星系中,每顆恆星一般都伴隨著一顆或多顆行星。研究恆星如何形成和演化是天體物理學的一個重要分支領域。
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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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