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Things to Do. Museum Blog. Sign Up for Email. By signing up I agree that I am 13 years or older, or I have my parent or guardian's consent. Buy Tickets Membership Donate. When light is scattered in a cloud it usually is sent back upwards, or out to the sides of the cloud, making the tops and sides of the cloud whiter than the base which receives less light.
This is more prominent in rain clouds because the cloud droplets are bigger, thus scattering more light. This means that even less light from the Sun reaches the bottom of the cloud, giving rain clouds their intimidating appearance. Because the tops of clouds have a constant source of white light, they are always white! If you are ever on a plane, look out the window when you are above the clouds, you will see that the tops of all the clouds will be a brilliant white.
At sunrise or sunset, clouds can take on a red or orange colour. This is because during sunrise and sunset, the Sun is very low in the sky and so light has to travel through more of the atmosphere. As a result more of the blue light is scattered and deflected away allowing more red and yellow light to reach the Earth. Why are clouds white? In more detail So why are clouds sometimes grey? The taller the clouds become, the grayer their bottoms look.
Answer originally posted January 24, Sign up for our email newsletter. Already a subscriber? Sign in. Thanks for reading Scientific American. Create your free account or Sign in to continue. See Subscription Options. Discover World-Changing Science.
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