The sky on some exoplanets might be a permanent deep red
Planets orbiting cool M-dwarf stars likely feature skies bathed in eternal crimson hues because these stars emit most of their light in the long-wavelength red and infrared spectrum.
Red dwarf stars are the most common stars in our galaxy and emit significantly less high-energy blue light than our Sun. On planets orbiting these stars, Rayleigh scattering—the process that makes Earth's sky blue—acts on longer wavelengths, resulting in a deep red or orange firmament.
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