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As December begins, simply pointing binoculars at bright, ocher Mars places dim, lime-tinged Uranus in the same field of view. That red-and-green traffic light conjunction, low in the southwest after sunset, provides an easy way for novices to find the rarely seen Uranus. The conjunction also highlights the two most deeply tinted planets, raising an age-old question: What gives planets their distinctive colors? 相似文献
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