Also known as celestial dome, celestial vault, firmament
upright=1.25|thumb|The night sky over Slovenia in July upright=1.25|thumb|cirrus cloud|Cirriform clouds and a quarter [[Moon in the blue daytime sky over Germany]]
The sky is the atmosphere and space visible above Earth, where clouds, the Moon, and other celestial objects appear. It matters because it contains the air we breathe, protects us from harmful radiation, and plays a central role in weather and climate systems.
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).