Why does the sun appear reddish early in the morning? Will this phenomenon be observed by an astronaut on the Moon? Give reason to justify your answer.

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Solution

In early morning, the sun is at the farthest distance from earth surface. When the white light from passes through the earth's atmosphere, light with smaller wavelength (blue) gets scattered from the dust particles in the atmosphere and only red light reaches the human eye lens. Thus the sun appears red in early morning.
This phenomenon cannot be seen by an astronaut on the moon because there is no atmosphere on moon to scatter the light.

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