Glossary term: 天空
Description: 当我们站在户外，向地平线之上看去，视线又不受地球上任何建筑物阻挡时，就能看到天空。地平线是我们所能看到的地球和地球上建筑物的边界。在夜晚晴朗的天空中，我们可以看到遥远的行星、恒星，甚至一些星系（北半球的仙女座星系和南半球的麦哲伦云）。星点的闪烁证明我们仍在透过地球大气层的气体观察天体。白天，被空气分子散射的阳光使天空呈现出蓝色，遮挡了我们观察宇宙深处的视线。遮住天空的云或雾也会让我们无法观测到任何天体。
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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
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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