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The sands of time are running out for the central star of this hourglass-shaped planetary nebula. 在这一酷似沙漏形状的星云内，“时间之沙”即将从中央星之中流逝殆尽。 With its nuclear fuel exhausted, this brief but spectacular closing phase of MyCn18 - better known as the Engraved Hourglass Nebula - occurs as its outer layers are ejected. 随着其本身的核燃料的消耗几近枯竭，被称为“沙漏星云”的MyCn18的最外层开始朝外喷射，它这一短暂而又壮阔的生命也行将结束。 | 
