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Why the sky looks blue
Sunlight crosses the and reaches our . Air scatters the blue light in every direction, so on a clear day, with not a single , the sky looks blue.
sky noun · A1
The space above the Earth where you see clouds and stars.
planet noun · A2
A large round object in space that moves around a star.
cloud noun · A1
A white or grey mass in the sky made of small drops of water.