noun
a measure of the brightness of a celestial object, such as a star, as it would be seen from a standard distance of 10 parsecs (32.6 light years)
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The absolute magnitude of a star is a measure of its intrinsic brightness.
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The absolute magnitude tells us how bright a star really is.
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The absolute magnitude is like the star's true brightness.
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The absolute magnitude shines a light on the star's real luminosity.