なぜ空は青くて夕焼けは赤いの？
When sunlight enters Earth’s atmosphere, it gets scattered by the air. Blue light is scattered more than other colors because it travels in shorter waves. That’s why the sky looks blue during the day. But during sunset, the sun is lower in the sky and the light has to pass through more air. Most of the blue light is scattered away, so the red and orange colors become stronger. This is why sunsets often look red or orange.
