なぜ空は青いの？
The sky looks blue because the air scatters sunlight. Sunlight is made up of many colors, like a rainbow. Blue light is scattered more than other colors because it travels in shorter waves. This makes the sky appear blue to our eyes. This effect is called Rayleigh scattering. In the morning or evening, the light travels a longer way, so red and orange light can be seen more easily. That’s why the sky turns red or orange at sunrise and sunset.
