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In a perfect vacuum, all wavelengths travel the same distance. In atmosphere, longer wavelengths (red) travel further than shorter wavelengths (blue) due to a phenomenon called Rayleigh scattering. That is why the sky is blue, and the setting sun is red. Similarly, in interstellar space (when we view light from distant stars), shorter wavelengths (blue) do not travel as far as longer wavelengths (red) due to a phenomenon called interstellar extinction. See the Related Links below for Wikipedia articles on Rayleigh scattering and interstellar extinction.

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