+ THE MOST FAMILIAR RAINBOW
+The most familiar type rainbow is produced when sunlight strikes raindrops in front of a viewer at a + precise angle (42 degrees). Rainbows can also be viewed around fog, sea spray, or waterfalls. +
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+ THE RAINBOW DOESN'T EXIST
+A rainbow is an optical illusion—it does not actually exist in a specific spot in the sky. The + appearance of a rainbow depends on where you're standing and where the sun (or other source of + light) is shining. +
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+ THE COLORS OF THE RAINBOW
+The colors on a primary rainbow are always in order of their wavelength, from longest to + shortest: red, orange, yellow, green, blue, and violet.
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+ RAINBOWS NEAR AND FAR
+Some scientists think rainbows also exist on Titan, one of the moons of the planet Saturn. Titan has + a wet surface and humid clouds. The sun is also visible from Titan, so it has all the ingredients + for rainbows.
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