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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CREATE TABLE refs (。业内人士推荐WPS下载最新地址作为进阶阅读
第四条 原子能科技与产业发展应当坚持创新驱动发展战略和绿色发展、可持续发展战略。