Measure of reflection (of, eg, a planet) (6)

I believe the answer is:

albedo

(Other definitions for albedo that I've seen before include "Proportion of astronomers" , "Measure of planet's reflection" , "Proportion of light a planet reflects" , "Measure of a surface's reflectivity" , "Reflectivity of a surface" .)

I've seen this clue in The Times.

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