16: Why does the sky have an orange, yellow and reddish color around sunrise and sunset?

The rays of sun traverse a greater part of the atmosphere at sunrise and sunset as they are very near to the horizon surface.

Explanation:

The rays of the sun traverse a greater part of the atmosphere at sunrise and sunset as they are very near to the horizon surface. Hence Energy apart from red is mainly scattered away. Much of the red light, the least scattered, streams through our faces. Therefore, The sun and the clouds look reddish and orange