The total amount of power (in watts, for example)that a star radiates into space is called its .

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Luminosity is the total amount of power that a star radiates into space. It is a measure of the star's energy output and is usually expressed in watts. Apparent brightness is the amount of energy received by an observer on Earth and depends on the distance to the star as well as its luminosity. Flux is the amount of energy received by a unit area per unit time and is also dependent on the distance to the star. Absolute magnitude is a measure of how bright a star would appear if it were located at a standard distance of 10 parsecs from Earth.

The Total Amount of Power (In Watts, for Example)that a Star