Why is the sky blue? Here is the simple answer.
What is sunlight?
Sunlight is really a mix of all the colors of the rainbow.
Why is it blue?
On its way down, sunlight bumps into the tiny particles that make up the air. Blue light bounces off them much more than red or yellow light. So blue gets scattered all over the sky, and that is the color we see.
Why are sunsets red?
At sunset, sunlight travels through much more air to reach you. Most of the blue bounces away before it gets here. The reds and oranges are what is left.
What about Mars?
And on Mars, the daytime sky looks orange and the sunset glows blue.
