Neptune is blue from "summary" of Space Encyclopedia by David A. Aguilar,Christine Pulliam,Patricia Daniels
Neptune, the eighth and farthest planet from the sun in our solar system, is a stunning shade of blue. But why is Neptune blue? The answer lies in its atmosphere, which is composed mainly of hydrogen, helium, and methane. Methane in the atmosphere of Neptune absorbs red light, reflecting blue light back into space. This process is known as Rayleigh scattering, the same phenomenon that makes Earth's sky appear blue. The presence of methane also gives Neptune its vivid blue color. Additionally, the high levels...
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