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why thus the sky looks blue and white in morning and black in night?
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.

The black sky at night that shows you the moon, planets and stars is due to the absence of the Sun’s light. The overwhelming effect of the Sun's light reacting with the atmosphere blacks out (conceal) the blackness of the sky (outer space)


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