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Why is the sky blue in the day and black at night? - tellmewhyfacts
During the day (daylight) the sky has a blue appearance because the Sun’s light (white light) is made up of rainbow of colors (red, orange, yellow, green, blue, indigo and violet) of different wavelength. This means, all these different colors of light combine to give you what is called white light. When sunlight enters the Earth’s atmosphere, …