All articles tagged with #rayleigh scattering
On the Moon’s airless sky, sunlight hits the surface directly and the Sun appears essentially white against a black backdrop; on Earth, Rayleigh scattering removes blue wavelengths and, along with our atmosphere, makes the sky blue and the Sun look yellow. The familiar yellow Sun is therefore a perceptual effect caused by Earth’s atmosphere, not the Sun’s intrinsic color.
From space the Sun appears white; on Earth its color shifts toward yellow because the atmosphere scatters shorter blue wavelengths (Rayleigh scattering), while the sky looks blue from the same process. The label “yellow dwarf” is a convention, not a literal color; at noon the Sun is nearly white, and at sunrise/sunset the light reddens as it traverses more atmosphere. Space- and Moon-based observations consistently show a white Sun.
The sky appears blue because molecules in Earth's atmosphere scatter shorter wavelengths of light, such as blue and violet, through a phenomenon called Rayleigh scattering. The sun's composition and our eyes' sensitivity to different colors also contribute to the perception of a blue sky. At sunset, the blue light is scattered away, leaving only orange, red, and yellow wavelengths to color the sky. The color of the sky can vary on other planets depending on their atmospheric composition and the spectrum of light they receive.