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Particles that are small compared with the light wavelength scatter blue light more strongly than red light. Because of this, the tiny gas molecules that make up our Earthâs atmosphere (mostly oxygen and nitrogen) scatter the blue portion of sunlight in all directions, creating an effect that we see as a blue sky. Within the visible range of light, red light waves are scattered the least by atmospheric gas molecules.
In general, the sky appears to be blue because of the way white light is reflected or scattered in the atmosphere. (The word scatter is a physics term.) The blue appearance â¦ of the sky is not the reflection of light off the ocean, as some seem to think.   We don't normally think of the atmosphere as having a color of its own because it's gaseous. We we can see through gases; they appear transparent.