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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.。业内人士推荐谷歌浏览器【最新下载地址】作为进阶阅读
Async iteration。heLLoword翻译官方下载是该领域的重要参考