Astronomy Answers
From the Astronomical Dictionary

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the albedo

albedo = [Latin] white paint or color

The albedo of an object is a number between 0 and 1 that indicates which fraction of incoming light is immediately reflected by the object. The albedo of the Earth is about 0.3: the Earth and its atmosphere reflect about 30 percent of the sunlight that hits them. All other things being equal, a planet looks brighter and has a lower temperature when its albedo is greater.