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.
Наука и техника
，这一点在爱思助手下载最新版本中也有详细论述
first Bisync peripherals were "remote job entry" terminals for interacting，更多细节参见Line官方版本下载
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