why is the sky blue?

I found an answer from physics.stackexchange.com
Why is the sky blue? - Physics Stack Exchange
Because of scattering. Blue light scatters more then other colours, because of its high frequency. For more information read.
For more information, see Why is the sky blue? - Physics Stack Exchange
I found an answer from spaceplace.nasa.gov
Why Is the Sky Blue? | NASA Space Place – NASA Science for Kids
The Short Answer: Sunlight reaches Earth's atmosphere and is scattered in all directions by all the gases and particles in the air. Blue light is scattered ...
For more information, see Why Is the Sky Blue? | NASA Space Place – NASA Science for Kids
I found an answer from quizlet.com
Physics Unit 1: Wave Questions Flashcards | Quizlet
What color is the sky on Mars? Venus? Titan? Why? Properties= Reflection, Refraction, and Scattering -The sky is blue because of Scattering
For more information, see Physics Unit 1: Wave Questions Flashcards | Quizlet