Why is the Sky Blue and Sunsets Red?

Sunlight travels through Earth’s atmosphere where it is redirected by gas molecules and small particles into various directions, with blue wavelengths becoming scattered more readily than others, giving the sky its characteristic color during daylight hours. Sunrise and sunset sunlight must pass through more of the atmosphere, leading to more blue being scattered away and…

Why is the Sky Less Blue?

Have you ever looked up at a stunning blue sky and wondered why its hue was blue? That isn’t surprising as sky color results from complex interactions among air molecules. Simple explanation: Because oxygen and nitrogen molecules are significantly smaller than light wavelengths, they scatter it more strongly resulting in blue light being scattered more…

Why is the Sky So Blue?

As sunlight passes through the atmosphere, its wavelengths (color) are scattered by air molecules into all directions, with blue wavelengths being scattered more strongly than others – hence why the sky appears bluer. Atmospheric oxygen is provided to us by microbes known as cyanobacteria through photosynthesis; they produce water and carbon dioxide which plants turn…