GRE阅读高频机经原文及答案：Supernova
<p> 16. <span word="Supernova">Supernova</span> <span word="D">D</span> 89-12</p><p> <span word="Astronomers">Astronomers</span> <span word="observe">observe</span> <span word="a">a</span> <span word="supernova">supernova</span> <span word="that">that</span> <span word="is">is</span> <span word="dimmer">dimmer</span> <span word="than">than</span> <span word="expected">expected</span> <span word="because">because</span> <span word="of">of</span> <span word="dust">dust</span> <span word="screening">screening</span>，<span word="If">If</span> <span word="a">a</span> <span word="supernova">supernova</span> <span word="triggered">triggered</span> <span word="star">star</span> <span word="formation">formation</span> <span word="from">from</span> <span word="dense">dense</span> <span word="clouds">clouds</span> <span word="of">of</span> <span word="gas">gas</span> <span word="and">and</span> <span word="dust">dust</span>, <span word="and">and</span> <span word="if">if</span> <span word="the">the</span> <span word="most">most</span> <span word="massive">massive</span> <span word="star">star</span> <span word="to">to</span> <span word="be">be</span> <span word="formed">formed</span> <span word="from">from</span> <span word="the">the</span> <span word="cloud">cloud</span> <span word="evolved">evolved</span> <span word="into">into</span> <span word="a">a</span> <span word="supernova">supernova</span> <span word="and">and</span> <span word="triggered">triggered</span> <span word="a">a</span> <span word="new">new</span> <span word="round">round</span> <span word="of">of</span> <span word="star">star</span> <span word="formation">formation</span>, <span word="and">and</span> <span word="so">so</span> <span word="on">on</span>, <span word="then">then</span> <span word="a">a</span> <span word="chain">chain</span> <span word="of">of</span> <span word="star">star</span>-<span word="forming">forming</span> <span word="regions">regions</span> <span word="would">would</span> <span word="result">result</span>. <span word="If">If</span> <span word="many">many</span> <span word="such">such</span> <span word="chains">chains</span> <span word="were">were</span> <span word="created">created</span> <span word="in">in</span> <span word="a">a</span> <span word="differentially">differentially</span> <span word="rotating">rotating</span> <span word="galaxy">galaxy</span>, <span word="the">the</span> <span word="distribution">distribution</span> <span word="of">of</span> <span word="stars">stars</span> <span word="would">would</span> <span word="resemble">resemble</span> <span word="the">the</span> <span word="observed">observed</span> <span word="distribute">distribute</span> <span word="in">in</span> <span word="a">a</span> <span word="spiral">spiral</span> <span word="galaxy">galaxy</span>.</p><p> <span word="This">This</span> <span word="line">line</span> <span word="of">of</span> <span word="reasoning">reasoning</span> <span word="underlies">underlies</span> <span word="an">an</span> <span word="exciting">exciting</span> <span word="new">new</span> <span word="theory">theory</span> <span word="of">of</span> <span word="spiral">spiral</span>-<span word="galaxy">galaxy</span> <span word="structure">structure</span>. <span word="A">A</span> <span word="computer">computer</span> <span word="simulation">simulation</span> <span word="based">based</span> <span word="on">on</span> <span word="this">this</span> <span word="theory">theory</span> <span word="has">has</span> <span word="reproduced">reproduced</span> <span word="the">the</span> <span word="appearance">appearance</span> <span word="of">of</span> <span word="many">many</span> <span word="spiral">spiral</span> <span word="galaxies">galaxies</span> <span word="without">without</span> <span word="assuming">assuming</span> <span word="an">an</span> <span word="underlying">underlying</span> <span word="density">density</span> <span word="wave">wave</span>, <span word="the">the</span> <span word="hallmark">hallmark</span> <span word="of">of</span> <span word="the">the</span> <span word="most">most</span> <span word="widely">widely</span> <span word="accepted">accepted</span> <span word="theory">theory</span> <span word="of">of</span> <span word="the">the</span> <span word="large">large</span>-<span word="scale">scale</span> <span word="structure">structure</span> <span word="of">of</span> <span word="spiral">spiral</span> <span word="galaxies">galaxies</span>. <span word="That">That</span> <span word="theory">theory</span> <span word="maintains">maintains</span> <span word="that">that</span> <span word="a">a</span> <span word="density">density</span> <span word="wave">wave</span> <span word="of">of</span> <span word="spiral">spiral</span> <span word="form">form</span> <span word="sweeps">sweeps</span> <span word="through">through</span> <span word="the">the</span> <span word="central">central</span> <span word="plane">plane</span> <span word="of">of</span> <span word="a">a</span> <span word="galaxy">galaxy</span>, <span word="compressing">compressing</span> <span word="clouds">clouds</span> <span word="of">of</span> <span word="gas">gas</span> <span word="and">and</span> <span word="dust">dust</span>, <span word="which">which</span> <span word="collapse">collapse</span> <span word="into">into</span> <span word="stars">stars</span> <span word="that">that</span> <span word="form">form</span> <span word="a">a</span> <span word="spiral">spiral</span> <span word="pattern">pattern</span>.</p><p> 相关文章：</p><p> <span word="If">If</span> <span word="a">a</span> <span word="supernova">supernova</span> <span word="triggered">triggered</span> <span word="star">star</span> <span word="formation">formation</span> <span word="from">from</span> <span word="dense">dense</span> <span word="clouds">clouds</span> <span word="of">of</span> <span word="gas">gas</span> <span word="and">and</span> <span word="dust">dust</span>, <span word="and">and</span> <span word="if">if</span> <span word="the">the</span> <span word="most">most</span> <span word="massive">massive</span> <span word="star">star</span> <span word="to">to</span> <span word="be">be</span> <span word="formed">formed</span> <span word="from">from</span> <span word="the">the</span> <span word="cloud">cloud</span> <span word="evolved">evolved</span> <span word="into">into</span> <span word="a">a</span> <span word="supernova">supernova</span> <span word="and">and</span> <span word="triggered">triggered</span> <span word="a">a</span> <span word="new">new</span> <span word="round">round</span> <span word="of">of</span> <span word="star">star</span> <span word="formation">formation</span>, <span word="and">and</span> <span word="so">so</span> <span word="on">on</span>, <span word="then">then</span> <span word="a">a</span> <span word="chain">chain</span> <span word="of">of</span> <span word="star">star</span>-<span word="forming">forming</span> <span word="regions">regions</span> <span word="would">would</span> <span word="result">result</span>. <span word="If">If</span> <span word="many">many</span> <span word="such">such</span> <span word="chains">chains</span> <span word="were">were</span> <span word="created">created</span> <span word="in">in</span> <span word="a">a</span> <span word="differentially">differentially</span> <span word="rotating">rotating</span> <span word="galaxy">galaxy</span>, <span word="the">the</span> <span word="distribution">distribution</span> <span word="of">of</span> <span word="stars">stars</span> <span word="would">would</span> <span word="resemble">resemble</span> <span word="the">the</span> <span word="observed">observed</span> <span word="distribution">distribution</span> <span word="in">in</span> <span word="a">a</span> <span word="spiral">spiral</span> <span word="galaxy">galaxy</span> 螺旋星云,旋涡星云).</p>
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