NGC 2440：一颗新白矮星的茧
(原标题: NGC 2440: Cocoon of a New White Dwarf)
2023-12-24
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中间那个是什么？就像蝴蝶一样，一颗白矮星的生命开始于摆脱包裹着自己的气体茧。然而，在这个类比中，太阳将是一只毛毛虫，而喷出的气体壳将成为最漂亮的茧。在这个特殊的茧中，被命名为NGC 2440的行星状星云包含了已知最热的白矮星之一。白矮星可以被看作是图像中心附近明亮的橙色点。我们的太阳最终会变成白矮星蝴蝶，但这还需要50亿年的时间。
查看原文解释
What's that in the center? Like a butterfly, a white dwarf star begins its life by casting off a cocoon of gas that enclosed its former self. In this analogy, however, the Sun would be a caterpillar and the ejected shell of gas would become the prettiest cocoon of all. In the featured cocoon, the planetary nebula designated NGC 2440 contains one of the hottest white dwarf stars known. The white dwarf can be seen as the bright orange dot near the image center. Our Sun will eventually become a white dwarf butterfly, but not for another 5 billion years.