Question

how sky is formed and why it is in blue colour

Answer 1

Blue light is scattered in all directions by the tiny molecules of air in Earth's atmosphere. Blue is scattered more than other colors because it travels as shorter, smaller waves. This is why we see a blue sky most of the time. ... Also, the surface of Earth has reflected and scattered the light.

Answer 2

Blue light is scattered in all directions by the tiny molecules of air in Earth's atmosphere. BLUE is scattered more than other colors because it travels at shorter, smaller waves. THIS is why we see the blue sky most of the time,... All this scattering mixes the colors together again so we see more white and less blue.