Albedo

The albedo of an object is the extent to which it reflects light, more specifically light which comes from the Sun. It is defined as the ratio of reflected to incident electromagnetic radiation. It is a unitless measure indicative of a surface's or body's diffuse reflectivity. The word is derived from albus, a Latin word for "white".

 Other websites 
 Albedo - Encyclopedia of Earth
 NASA MODIS Terra BRDF/albedo product site 
 NASA MODIS BRDF/albedo product site 
 A discussion of Lunar albedos

Category:Optics