Absolute magnitude is the brightness of a star in the night sky.

Name: Absolute magnitude is the brightness of a star in the night sky.
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Quizplus · Accepted Answer

Absolute magnitude is a measure of the intrinsic brightness of a celestial object, as it would appear if it were placed at a standard distance of 10 parsecs from Earth, not its brightness as seen in the night sky.

Absolute Magnitude Is the Brightness of a Star in the Night