The absolute magnitude of a star is the apparent magnitude it would have if it were 10 pc from Earth.

Name: The absolute magnitude of a star is the apparent magnitude it would have if it were 10 pc from Earth.
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Quizplus · Accepted Answer

This is the definition of absolute magnitude. It is a standardized measure of a star's intrinsic brightness, corrected for distance. By placing all stars at a fixed distance of 10 parsecs, astronomers can compare their luminosities directly.

The Absolute Magnitude of a Star Is the Apparent Magnitude