2026-02-28 00:00:00:03014273810http://paper.people.com.cn/rmrb/pc/content/202602/28/content_30142738.htmlhttp://paper.people.com.cn/rmrb/pad/content/202602/28/content_30142738.html11921 本版责编：白真智 刘梦丹 刘子赫 闵方正
A so-called "planetary nebula" is a confusing misnomer because these clouds have nothing to do with planets. As a medium-size star nears the end, it puffs out into a red giant — about 100 to 1,000 times its original size — eventually engulfing the space around it, including any nearby worlds.
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