The wavelength
distributions of the radiation emitted by
the sun and the earth are very different, because the sun is so much hotter than the earth.
The
Planck functions for temperatures characteristic of the sun and the earth. The peak wavelength of the sunÕs distribution is at about 0.5 microns (green light), while the peak wavelength for the earthÕs distribution is at about 10 microns (infrared radiation).