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11. Explain why the planets do not twinkle.12. Why does the Sun appear reddish early in the morning?13. Why does the sky appear dark instead of blue to an astronaut?

Answer»

11. The planets are much closer to the earth, and are thus seen as extended sources. If we consider a planet as a collection of a large number of point-sized sources of light, the total variation in the amount of light entering our eye from all the individual point-sized sources will average out to zero, thereby nullifying the twinkling effect. Hence, the planets do not twinkle.12. It is due to scattering of light. Light near the horizon passes thicker layers of air and larger distance of atmosphere hence, most of the blue light is scattered away and longer wavelengths reach our eyes giving rise to reddish colour of sun.13.Because there is no atmosphere in the space.



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