银河系居然是弯的!
<p><span word="Astronomers">Astronomers</span> <span word="have">have</span> <span word="created">created</span> <span word="the">the</span> <span word="most">most</span> <span word="precise">precise</span> <span word="map">map</span> <span word="to">to</span> <span word="date">date</span> <span word="of">of</span> <span word="the">the</span> <span word="Milky">Milky</span> <span word="Way">Way</span> <span word="by">by</span> <span word="tracking">tracking</span> <span word="thousands">thousands</span> <span word="of">of</span> <span word="big">big</span> <span word="pulsating">pulsating</span> <span word="stars">stars</span> <span word="spread">spread</span> <span word="throughout">throughout</span> <span word="the">the</span> <span word="galaxy">galaxy</span>, <span word="demonstrating">demonstrating</span> <span word="that">that</span> <span word="its">its</span> <span word="disk">disk</span> <span word="of">of</span> <span word="myriad">myriad</span> <span word="stars">stars</span> <span word="is">is</span> <span word="not">not</span> <span word="flat">flat</span> <span word="but">but</span> <span word="dramatically">dramatically</span> <span word="warped">warped</span> <span word="and">and</span> <span word="twisted">twisted</span> <span word="in">in</span> <span word="shape">shape</span>.</p><p>天文学家通过追踪遍布银河系的数千颗大的脉动变星，绘制出了迄今为止最精确的银河系地图。从地图上看，由无数恒星组成的星系盘并非扁平，而很明显是弯曲的、扭曲的。</p><p><span word="The">The</span> <span word="researchers">researchers</span> <span word="on">on</span> <span word="Thursday">Thursday</span> <span word="unveiled">unveiled</span> <span word="a">a</span> <span word="three">three</span>-<span word="dimensional">dimensional</span> <span word="map">map</span> <span word="of">of</span> <span word="the">the</span> <span word="Milky">Milky</span> <span word="Way">Way</span> - <span word="home">home</span> <span word="to">to</span> <span word="more">more</span> <span word="than">than</span> 100 <span word="billion">billion</span> <span word="stars">stars</span> <span word="including">including</span> <span word="our">our</span> <span word="sun">sun</span> - <span word="providing">providing</span> <span word="a">a</span> <span word="comprehensive">comprehensive</span> <span word="chart">chart</span> <span word="of">of</span> <span word="its">its</span> <span word="structure">structure</span>: <span word="a">a</span> <span word="stellar">stellar</span> <span word="disk">disk</span> <span word="comprised">comprised</span> <span word="of">of</span> <span word="four">four</span> <span word="major">major</span> <span word="spiral">spiral</span> <span word="arms">arms</span> <span word="and">and</span> <span word="a">a</span> <span word="bar">bar</span>-<span word="shaped">shaped</span> <span word="core">core</span> <span word="region">region</span>.</p><p>研究人员于上周四公布了一张银河系的三维地图，其中包括太阳在内共有1000多亿颗恒星。这张地图全面展示了银河系结构：由四个大的螺旋型枝节和一个条状的核心区域组成的星系盘。</p>
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