一周太空图片精选：罕见夜光云闪闪发亮

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新浪环球地理讯 北京时间5月16日消息，据美国国家地理网站报道，美国国家地理网站刊登了过去一周公布的最佳太空图片，其中包括：宇宙七仙女、超级月亮、恒星诞生记等。

夜光云闪闪发光


国家地理杂志于5月4日公布了一幅关于加拿大艾伯塔省上空罕见夜光云的图片。所谓夜光云，就是在天黑之后仍然闪闪发亮的云层，因为这些云层在大气中所处的位置非常高，以至于太阳在落到地平线以下之后，阳光还能照射到这些云层上。美国宇航局介绍称，这些罕见的云层在更靠南边纬度的地区更容易出现，天文学家也不确定其原因。科学家们怀疑这种情况的发生是因为天气的变化：随着表层气温的上升，上层大气由于二氧化碳的积聚而变得越来越冷，从而为云层的形成创造了得天独厚的条件。

宇宙七仙女


M45星团，也被称为七姐妹星团。据美国宇航局介绍，七姐妹星团是已知最亮星团之一，它包含了3000多颗恒星。七姐妹星团距离地球大约400光年，也是距离地球最近的星团之一。
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