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Why are astronomers much more interested in the luminosity of a star than its apparent brightness?

Why are astronomers much more interested in the luminosity of a star than its apparent brightness?
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Why are astronomers much more interested in the luminosity of a star than its apparent brightness?

User George Madrid
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Because the luminosity tells us how bright a star really is, while apparent brightness only tells us how bright it happens to look from Earth.
User Deathfry
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