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Marc notices that when he looks at the stars at night, some appear to be brighter than others. Which three factors affect how bright a star appears to an observer on Earth?
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Marc notices that when he looks at the stars at night, some appear to be brighter than others. Which three factors affect how bright a star appears to an observer on Earth?

User Alex Ivasyuv
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-Its distance relative to the earth
-Its size
-its chemical makeup
User Pizzicato
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