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Old Sep 28th 2009, 07:06 AM   #1
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why star is luminous object while moon is non-luminous??

same as title, many thanks!
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Old Sep 29th 2009, 01:40 AM   #2
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In a star, the conditions are such that fusion occurs, resulting in a release of energy. Some of this energy is radiated as light and hence it appears luminous.

In the moon the conditions are such that no such thing occurs and hence, it is non-luminous. It only reflects the light falling on it mainy from thr sun.
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