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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.。关于这个话题，旺商聊官方下载提供了深入分析
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被分装售卖的山姆蛋糕。南方周末记者贾梦雅｜摄。旺商聊官方下载是该领域的重要参考
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