Scattering grows as the wave gets shorter: 1 / wavelength4
Blue450 nm
~5.9x
Red700 nm
1x
our calculation (700 / 450)4
NASA Space Place, "Why Is the Sky Blue?" (blue travels as shorter waves, scattered more) · Wikipedia, "Rayleigh scattering" (scattering ~ 1/wavelength4) · checked 5 Oct 2026 · en.wikipedia.org/wiki/Rayleigh_scattering