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Interesting question. Sometimes in the fall the moon really can look

orange and yellow. If you observe closely, though, you'll find that the

in the fall, when the moon is right overhead, it looks pretty white. And

in the winter, when the moon is close to the horizon, it can look pretty

orange. Here's what's going on.

The first thing that you have to understand is that there are different

kinds of light. Green light, for instance, is different than red light.

Blue light is different than yellow light. The main difference is that

different colors of lights have different wavelengths. Light travels in

waves, and the distance from one peak of a wave to another is called the

wavelength. Blue light has a very short wavelength, and red light has the

longest.

The second thing to understand is that the air in our atmosphere acts

like a filter. It filters out short wavelength light, and scatters the

short wavelengths around. The short wavelengths are the blue ones. The

greens, yellows, and reds come through. That's why the sky looks blue.

All the blue light is bouncing around the air before it comes down, so the

sky looks blue.

At night, when the moon is right overhead, it looks white. White light

is made up of all different colors of light, including blue. When the

moon is right overhead, it comes straight through the atmosphere, so not

much of the blue light gets scattered. But when the moon gets close to

the horizon, it isn't coming at you straight on. It's kind of slanting at

us, and it's going through a lot more air. The more air the white

moonlight has to go through, the more chance for the short wavelength

(blue) light to get scattered out. The green light is pretty short too,

so it gets filtered out too. What's left is the red and yellow light.

And that's why you only see the red and yellow light when the moon gets

close to the horizon, and that's why the white moon looks red and yellow

whenever it is about to rise or set.

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17y ago

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