Why do we see spectacular events in the sky like rainbows red sunset and blue sky?

These spectacular events in the sky are caused by the interaction of sunlight with particles and molecules in the Earth's atmosphere. Rainbows are formed when sunlight is refracted and reflected by water droplets in the air, creating a spectrum of colors. Red sunsets occur when the sun's light passes through more of the Earth's atmosphere, scattering shorter wavelengths of light and leaving behind the colors with longer wavelengths, like red and orange. Blue skies are a result of Rayleigh scattering, where shorter blue wavelengths of light are scattered more than other colors by gas molecules in the atmosphere.