What makes a red rainbow?
Rainbows are common and occur when the sun shines through a rainstorm. Water droplets in the atmosphere act as a prism, which scatters light waves, and in turn creates the colorful arc you see in the sky.
But red rainbows are far less common.
According to EarthSky, red rainbows are usually captured outside when the sun is low in the horizon at sunrise or sunset.
Red rainbows use the same physics as a sunset, which also give off red and orange hues.
At dusk or dawn, when the sun is closer to the horizon, this causes waves of light to travel much further. Shorter wavelengths — which include the colors blue and green — are filtered and scattered out, leaving behind the red and orange colors.
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