The sky is blue because air scatters short wavelengths far more strongly than long on. Sunlight arr as a mix of ev colour, a the mole of t atmosphere th the bl part o that mixture sideways in all directions while letting the red part pass. What reaches your eye from an empty patch of sky is therefore scattered light rather than direct light, which is also why the sun itself looks yellow.

Type only the missing letters. Each box is one letter, and the number of boxes matches the letters that are missing.