Why is the sky blue on earth

Artists concept

when you all look into the sky some of you may realise earth is the only planet having blue sky in the solar system unlike all other some even doesn't have an atmosphere. Even the most similar planet of the Earth in the solar system the Mars also doesn't have on with blue.

So why is our atmosphere blue????

When Sunlight reaches Earth's atmosphere and is scattered in all directions by all the gases and particles in the air. Blue light is scattered more than the other colors because it travels as shorter, smaller waves. Which is why we see a blue sky most of the time.