GRE阅读高频机经原文：星系吞食
<p> 31. 星系吞食</p><p> <span word="Galactic">Galactic</span> <span word="cannibalism">cannibalism</span> <span word="refers">refers</span> <span word="to">to</span> <span word="the">the</span> <span word="process">process</span> <span word="by">by</span> <span word="which">which</span> <span word="a">a</span> <span word="large">large</span> <span word="galaxy">galaxy</span>, <span word="through">through</span> <span word="tidal">tidal</span> <span word="gravitational">gravitational</span> <span word="interactions">interactions</span> <span word="with">with</span> <span word="a">a</span> <span word="companion">companion</span>, <span word="merges">merges</span> <span word="with">with</span> <span word="that">that</span> <span word="companion">companion</span>, <span word="resulting">resulting</span> <span word="in">in</span> <span word="a">a</span> <span word="larger">larger</span>, <span word="often">often</span> <span word="irregular">irregular</span> <span word="galaxy">galaxy</span>. <span word="The">The</span> <span word="most">most</span> <span word="common">common</span> <span word="result">result</span> <span word="of">of</span> <span word="the">the</span> <span word="gravitational">gravitational</span> <span word="merger">merger</span> <span word="of">of</span> <span word="two">two</span> <span word="or">or</span> <span word="more">more</span> <span word="galaxies">galaxies</span> <span word="is">is</span> <span word="an">an</span> <span word="irregular">irregular</span> <span word="galaxy">galaxy</span> <span word="of">of</span> <span word="one">one</span> <span word="form">form</span> <span word="or">or</span> <span word="another">another</span>, <span word="although">although</span> <span word="elliptical">elliptical</span> <span word="galaxies">galaxies</span> <span word="may">may</span> <span word="also">also</span> <span word="result">result</span>.</p><p> <span word="It">It</span> <span word="has">has</span> <span word="been">been</span> <span word="suggested">suggested</span> <span word="that">that</span> <span word="galactic">galactic</span> <span word="cannibalism">cannibalism</span> <span word="is">is</span> <span word="currently">currently</span> <span word="occurring">occurring</span> <span word="between">between</span> <span word="the">the</span> <span word="Milky">Milky</span> <span word="Way">Way</span> <span word="and">and</span> <span word="the">the</span> <span word="Large">Large</span> <span word="and">and</span> <span word="Small">Small</span> <span word="Magellanic">Magellanic</span> <span word="Clouds">Clouds</span>. <span word="Streams">Streams</span> <span word="of">of</span> <span word="gravitationally">gravitationally</span>-<span word="attracted">attracted</span> <span word="hydrogen">hydrogen</span> <span word="arcing">arcing</span> <span word="from">from</span> <span word="these">these</span> <span word="dwarf">dwarf</span> <span word="galaxies">galaxies</span> <span word="to">to</span> <span word="the">the</span> <span word="Milky">Milky</span> <span word="Way">Way</span> <span word="is">is</span> <span word="taken">taken</span> <span word="as">as</span> <span word="evidence">evidence</span> <span word="for">for</span> <span word="this">this</span> <span word="theory">theory</span>.</p><p> <span word="A">A</span> <span word="long">long</span> <span word="time">time</span> <span word="ago">ago</span>, <span word="in">in</span> <span word="a">a</span> <span word="galaxy">galaxy</span> <span word="far">far</span>, <span word="far">far</span> <span word="away">away</span>, <span word="the">the</span> <span word="real">real</span> <span word="battle">battle</span> <span word="of">of</span> <span word="star">star</span> <span word="wars">wars</span> <span word="was">was</span> <span word="wreaking">wreaking</span> <span word="havoc">havoc</span> <span word="on">on</span> <span word="two">two</span> <span word="galaxies">galaxies</span>. <span word="These">These</span> <span word="two">two</span> <span word="galaxies">galaxies</span>, <span word="known">known</span> <span word="as">as</span> <span word="the">the</span> <span word="Antennae">Antennae</span> <span word="Galaxies">Galaxies</span>, <span word="were">were</span> <span word="locked">locked</span> <span word="in">in</span> <span word="a">a</span> <span word="cosmic">cosmic</span> <span word="battle">battle</span> <span word="of">of</span> <span word="tug">tug</span>-<span word="of">of</span>-<span word="war">war</span>. <span word="This">This</span> <span word="process">process</span> <span word="of">of</span> <span word="galactic">galactic</span> <span word="destruction">destruction</span> <span word="is">is</span> <span word="more">more</span> <span word="common">common</span> <span word="than">than</span> <span word="once">once</span> <span word="thought">thought</span>, <span word="and">and</span> <span word="may">may</span> <span word="even">even</span> <span word="contribute">contribute</span> <span word="to">to</span> <span word="the">the</span> <span word="growth">growth</span> <span word="of">of</span> <span word="some">some</span> <span word="galaxies">galaxies</span>. <span word="Figure">Figure</span> 1: <span word="The">The</span> <span word="Antennae">Antennae</span> <span word="Galaxies">Galaxies</span>1 <span word="Each">Each</span> <span word="galaxy">galaxy</span> <span word="contains">contains</span> <span word="billions">billions</span> <span word="and">and</span> <span word="billions">billions</span> <span word="of">of</span> <span word="stars">stars</span>. <span word="This">This</span> <span word="makes">makes</span> <span word="galaxies">galaxies</span> <span word="extraordinarily">extraordinarily</span> <span word="heavy">heavy</span>, <span word="or">or</span> <span word="massive">massive</span>, <span word="and">and</span> <span word="massive">massive</span> <span word="objects">objects</span> <span word="can">can</span> <span word="exert">exert</span> <span word="very">very</span> <span word="strong">strong</span> <span word="gravitational">gravitational</span> <span word="forces">forces</span> <span word="in">in</span> <span word="space">space</span>. <span word="Just">Just</span> <span word="as">as</span> <span word="Earth">Earth</span> <span word="can">can</span> <span word="feel">feel</span> <span word="the">the</span> <span word="pull">pull</span> <span word="of">of</span> <span word="the">the</span> <span word="Sun">Sun</span> <span word="from">from</span> <span word="millions">millions</span> <span word="of">of</span> <span word="miles">miles</span> <span word="away">away</span>, <span word="so">so</span> <span word="too">too</span> <span word="can">can</span> <span word="a">a</span> <span word="galaxy">galaxy</span> <span word="feel">feel</span> <span word="the">the</span> <span word="gravitational">gravitational</span> <span word="tug">tug</span> <span word="of">of</span> <span word="another">another</span> <span word="galaxy">galaxy</span>. <span word="This">This</span> <span word="gravitational">gravitational</span> <span word="tug">tug</span> <span word="is">is</span> <span word="much">much</span> <span word="stronger">stronger</span> <span word="for">for</span> <span word="massive">massive</span> <span word="objects">objects</span> <span word="like">like</span> <span word="galaxies">galaxies</span> <span word="than">than</span> <span word="it">it</span> <span word="is">is</span> <span word="for">for</span> <span word="our">our</span> <span word="Sun">Sun</span>, <span word="so">so</span> <span word="galaxies">galaxies</span> <span word="that">that</span> <span word="are">are</span> <span word="millions">millions</span> <span word="of">of</span> <span word="light">light</span>-<span word="years">years</span> <span word="away">away</span> <span word="from">from</span> <span word="each">each</span> <span word="other">other</span> <span word="can">can</span> <span word="still">still</span> <span word="feel">feel</span> <span word="the">the</span> <span word="pull">pull</span> <span word="of">of</span> <span word="another">another</span> <span word="massive">massive</span> <span word="galaxy">galaxy</span>, <span word="even">even</span> <span word="though">though</span> <span word="they">they</span> <span word="are">are</span> <span word="so">so</span> <span word="far">far</span> <span word="apart">apart</span>. <span word="Like">Like</span> <span word="the">the</span> <span word="Antennae">Antennae</span> <span word="Galaxies">Galaxies</span> , <span word="two">two</span> <span word="galaxies">galaxies</span> <span word="that">that</span> <span word="feel">feel</span> <span word="the">the</span> <span word="tug">tug</span> <span word="of">of</span> <span word="each">each</span> <span word="other">other</span> <span word="will">will</span> <span word="race">race</span> <span word="towards">towards</span> <span word="each">each</span> <span word="other">other</span> <span word="at">at</span> <span word="incredible">incredible</span> <span word="speeds">speeds</span>, <span word="eventually">eventually</span> <span word="colliding">colliding</span> <span word="in">in</span> <span word="a">a</span> <span word="galactic">galactic</span> <span word="display">display</span> <span word="of">of</span> <span word="fireworks">fireworks</span>.</p>
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