Glossary term: 天空
Description: 當我們站在戶外，向地平線之上看去，視線又不受地球上任何建築物阻擋時，就能看到天空。地平線是我們所能看到的地球和地球上建築物的邊界。在夜晚晴朗的天空中，我們可以看到遙遠的行星、恆星，甚至一些星系（北半球的仙女座星系和南半球的麥哲倫雲）。星點的閃爍證明我們仍在透過地球大氣層的氣體觀察天體。白天，被空氣分子散射的陽光使天空呈現出藍色，遮擋了我們觀察宇宙深處的視線。遮住天空的雲或霧也會讓我們無法觀測到任何天體。
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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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