Different wavelengths of light produce different effects in our brains. (policygenius.com)
Laser Therapy is the use of specific wavelengths of light (red and near - infrared) to stimulate the body's natural ability to heal. (k-laser.com)
This is because the more distant the galaxy is, the more luminous part of light we can see due to the shift of wavelength of light by the expansion of the universe. (alma-telescope.jp)