What makes the sky blue?
The colour results from a process called scattering of light which happens in the earth’s atmosphere. Light comes from the sun and is a mixture of all colours, so light of every colour passes through our atmosphere. But blue light has more energy than the other colours, and when it hits some of the tiny molecules of which our air is made, it gives a little of its energy to them. Once they have a shot of this energy, these little particles get so excited that they release the energy, or blue light. Because there are trillions of these molecules in our atmosphere, bouncing blue light in every direction, we always see blue light coming from the sky.
