Because of its high temperature, the Sun emits to a large extent in the ultraviolet and visible (UV-Vis) frequency range. In this frequency range, the planet reflects a fraction α α of this energy where α α is the albedo or reflectance of the planet in the UV-Vis range. In other words, the planet absorbs a fraction 1 − − α α of the Sun's light, and reflects the rest. The power absorbed by the planet and its atmosphere is then: