Glossary term: 奧爾特雲
Description: 奧爾特雲是太陽系外的一個假想區域,被認為是長軌道週期彗星的起源地。奧爾特雲可能包含數十億個太陽系形成時遺留下來的小型冰體。它被認為是長週期彗星的儲藏庫。偶爾,這些冰凍小天體中的一個會被另一個冰體或一顆經過太陽系的恆星的引力擾亂軌道。這可能會使冰體墜落到太陽系內部,成為一顆彗星。奧爾特雲可能從幾千個天文單位(AU)延伸到十幾萬個天文單位(AU),是太陽最近的恆星半人馬座距離的一半。奧爾特雲內部可能是一個甜甜圈形狀,但外部可能是一個球形外殼。
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The original definition of this term in English have been approved by a research astronomer and a teacher
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This is an automated transliteration of the simplified Chinese translation of this term
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