沙漏星云喷射瞬间如同人眼
<p><span word="The">The</span> <span word="sands">sands</span> <span word="of">of</span> <span word="time">time</span> <span word="are">are</span> <span word="running">running</span> <span word="out">out</span> <span word="for">for</span> <span word="the">the</span> <span word="central">central</span> <span word="star">star</span> <span word="of">of</span> <span word="this">this</span> <span word="hourglass">hourglass</span>-<span word="shaped">shaped</span> <span word="planetary">planetary</span> <span word="nebula">nebula</span>. 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。</p><p><span word="With">With</span> <span word="its">its</span> <span word="nuclear">nuclear</span> <span word="fuel">fuel</span> <span word="exhausted">exhausted</span>, <span word="this">this</span> <span word="brief">brief</span> <span word="but">but</span> <span word="spectacular">spectacular</span> <span word="closing">closing</span> <span word="phase">phase</span> <span word="of">of</span> <span word="MyCn">MyCn</span>18 - <span word="better">better</span> <span word="known">known</span> <span word="as">as</span> <span word="the">the</span> <span word="Engraved">Engraved</span> <span word="Hourglass">Hourglass</span> <span word="Nebula">Nebula</span> - <span word="occurs">occurs</span> <span word="as">as</span> <span word="its">its</span> <span word="outer">outer</span> <span word="layers">layers</span> <span word="are">are</span> <span word="ejected">ejected</span>.</p><p>随着其本身的核燃料的消耗几近枯竭，被称为“沙漏星云”的<span word="MyCn">MyCn</span>18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。</p>
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