ALBEDO (from Lat. albus, white), "whiteness," a word used principally in astronomy for the measure of reflecting power. A body shining by reflected light is said to have albedo -12- if it reflects (or scatters outwards) half the light incident on it. The albedo for visual light of the cloud-covered planets (Venus, Jupiter, Saturn, Uranus, Neptune) ranges from o.56 to 0.73; of the earth o-44; Mars 0.15; Moon o.o7. (See H. N. Russell, Astrophysical Journal, vol. xliii. p. 173.)