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==Key Stage 4==
===Meaning===
[[Albedo]] is a [[measure]] of how much solar [[Solar Radiation|solar radiation]] is [[reflect]]ed and how much is [[Absorb (Physics)|absorbed]] by a [[planet]].
===About Albedo===
: The [[albedo]] of a [[planet]] affects the [[Mean Average|average]] [[temperature]] of a [[planet]]'s surface.
: A [[planet]] will achieve [[Temperature Constancy|temperature constancy]] when it [[emit]]s the same amount of [[radiation]] as it [[Absorb (Physics)|absorbs]].