The meaning of life constitutes a philosophical question concerning the purpose and significance of human existence. The concept can be expressed through a variety of related questions, such as Why are we here?, What's life all about? and What is the meaning of it all?. It has been the subject of much philosophical, scientific, and theological speculation throughout history and there have been a large number of answers from many different cultural and ideological backgrounds. (Wikipedia)
Some say that the answer is 42.
The blue color of the sky is due to Rayleigh scattering. As light moves through the atmosphere, most of the longer wavelengths pass straight through. Little of the red, orange and yellow light is affected by the air.
However, much of the shorter wavelength light is absorbed by the gas molecules. The absorbed blue light is then radiated in different directions. It gets scattered all around the sky. Whichever direction you look, some of this scattered blue light reaches you. Since you see the blue light from everywhere overhead, the sky looks blue. (Science Made Simple)
It has nothing to do with your moods.
