関連ワード:  is moon a natural source of light    is moon a natural source of light yes or no    moon is a natural source of light true or false    is moon a natural or artificial source of light    the moon is not a natural source of light why it looks bright    why is moon not regarded as a natural source of light    the moon is a luminous and natural source of light    moon is an example of natural source of light    moon is an example of natural source of light true or false    the moon shines brightly at night is it a natural source of light