Physics
When the Sun is near the horizon during the morning or evening, it appears reddish. The phenomenon that is responsible for this observation is

Scattering of light
Refraction of light
Reflection of light
Dispersion of light

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Physics
Planets do not twinkle because

They are very far away from the earth resulting in decrease in intensity of light
They emit light of a constant intensity
Their distance from the earth does not change with time
They are nearer to earth and hence we receive a greater amount of light.

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