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Albedo definition, Astronomy. the ratio of the light reflected by a planet or satellite to that received by it. See more.
Albedo is measured as the fraction of incident light that the surface reflects back in all directions. A perfect reflector by definition has an albedo of unity, i.e., all the incident light is reflected; a body that reflects no light at all would have an albedo of zero. Real surfaces have albedos between these values.