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.
BBC News is editorially independent from the wider corporation.。关于这个话题，heLLoword翻译官方下载提供了深入分析
，这一点在WPS官方版本下载中也有详细论述
人 民 网 版 权 所 有 ，未 经 书 面 授 权 禁 止 使 用
--security-opt label=type:unconfined_t \。WPS下载最新地址是该领域的重要参考
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