…why is the sky blue?

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The sky appears blue due to Rayleigh scattering, where shorter blue wavelengths of sunlight are scattered more than longer red wavelengths by molecules in the atmosphere.

Why Blue Light Scatters More

  • Sunlight contains all colors, but blue light has a shorter wavelength and is scattered in all directions by air molecules. 🔗
  • This scattered blue light reaches our eyes from all parts of the sky, making it appear blue.
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Why Not Other Colors?

  • Red and yellow light pass through more directly and are less scattered, so they dominate at sunrise and sunset.
  • The effect is most noticeable when the sun is high in the sky.
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Rainbow at Niagara Falls. Sunday Morning Photograph.
A rainbow at Niagara Falls only enhances this legendary natural wonder that is located on the Niagara River between the province of Ontario in Canada and the state of New York in the United States. Rainbow at Niagara Falls. Sunday Morning Photograph. Photograph ©2026 by Brian Cohen. If you want to see the rainbow for yourself, be sure to visit the falls during the late afternoon as the sun sets without clouds blocking it. The light can change dramatically within a mere few minutes, as evidenced by these photographs. Photograph ©2026 by

Related Questions

→ Why does Rayleigh Scattering cause the sky to appear blue? → What evidence supports the claim that blue light scatters more in the atmosphere? → What is the definition of Rayleigh Scattering in the context of atmospheric light scattering?

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