関連ワード:  what is the source of light    what is the source of light energy    what is the source of light in village in the evening    what is the source of light in the solar system    what is the source of lightning    what is the source of light for moon    what is the source of light and heat on earth    what is the source of light in the universe    what is the source of light during the day    what is the source of light in the new jerusalem