陨石小行星接踵而来 科学家称两者无关
<p></p><p><span word="The">The</span> <span word="trail">trail</span> <span word="of">of</span> <span word="a">a</span> <span word="falling">falling</span> <span word="object">object</span> <span word="is">is</span> <span word="seen">seen</span> <span word="above">above</span> <span word="the">the</span> <span word="Urals">Urals</span> <span word="city">city</span> <span word="of">of</span> <span word="Chelyabinsk">Chelyabinsk</span> <span word="February">February</span> 15, 2013, <span word="in">in</span> <span word="this">this</span> <span word="picture">picture</span>.</p><p><span word="The">The</span> <span word="meteor">meteor</span> <span word="explosion">explosion</span> <span word="over">over</span> <span word="Russia">Russia</span> <span word="that">that</span> <span word="injured">injured</span> <span word="more">more</span> <span word="than">than</span> 500 <span word="people">people</span> <span word="and">and</span> <span word="damaged">damaged</span> <span word="hundreds">hundreds</span> <span word="of">of</span> <span word="buildings">buildings</span> <span word="was">was</span> <span word="not">not</span> <span word="caused">caused</span> <span word="by">by</span> <span word="an">an</span> <span word="asteroid">asteroid</span> <span word="zooming">zooming</span> <span word="close">close</span> <span word="by">by</span> <span word="the">the</span> <span word="Earth">Earth</span> <span word="today">today</span> (<span word="Feb">Feb</span>.15), <span word="a">a</span> <span word="NASA">NASA</span> <span word="scientist">scientist</span> <span word="says">says</span>.</p><p><span word="NASA">NASA</span> <span word="asteroid">asteroid</span> <span word="expert">expert</span> <span word="Don">Don</span> <span word="Yeomans">Yeomans</span>, <span word="head">head</span> <span word="of">of</span> <span word="the">the</span> <span word="agency">agency</span>'<span word="s">s</span> <span word="Near">Near</span>-<span word="Earth">Earth</span> <span word="Object">Object</span> <span word="Program">Program</span> <span word="Office">Office</span>, <span word="told">told</span> <span word="SPACE">SPACE</span>.<span word="com">com</span> <span word="that">that</span> <span word="the">the</span> <span word="object">object</span> <span word="which">which</span> <span word="exploded">exploded</span> <span word="over">over</span> <span word="a">a</span> <span word="thinly">thinly</span> <span word="inhabited">inhabited</span> <span word="stretch">stretch</span> <span word="of">of</span> <span word="eastern">eastern</span> <span word="Europe">Europe</span> <span word="today">today</span> <span word="was">was</span> <span word="most">most</span> <span word="likely">likely</span> <span word="an">an</span> <span word="exploding">exploding</span> <span word="fireball">fireball</span> <span word="known">known</span> <span word="as">as</span> <span word="a">a</span> <span word="bolide">bolide</span>.</p><p><span word="More">More</span> <span word="than">than</span> 500 <span word="people">people</span> <span word="were">were</span> <span word="injured">injured</span>, <span word="mostly">mostly</span> <span word="by">by</span> <span word="glass">glass</span> <span word="cuts">cuts</span> <span word="when">when</span> <span word="windows">windows</span> <span word="shattered">shattered</span> <span word="during">during</span> <span word="the">the</span> <span word="blast">blast</span>, <span word="according">according</span> <span word="to">to</span> <span word="the">the</span> <span word="Russian">Russian</span> <span word="Emergency">Emergency</span> <span word="Ministry">Ministry</span>.</p><p>"<span word="If">If</span> <span word="the">the</span> <span word="reports">reports</span> <span word="of">of</span> <span word="ground">ground</span> <span word="damage">damage</span> <span word="can">can</span> <span word="be">be</span> <span word="verified">verified</span>, <span word="it">it</span> <span word="might">might</span> <span word="suggest">suggest</span> <span word="an">an</span> <span word="object">object</span> <span word="whose">whose</span> <span word="original">original</span> <span word="size">size</span> <span word="was">was</span> <span word="several">several</span> <span word="meters">meters</span> <span word="in">in</span> <span word="extent">extent</span> <span word="before">before</span> <span word="entering">entering</span> <span word="the">the</span> <span word="atmosphere">atmosphere</span>, <span word="fragmenting">fragmenting</span> <span word="and">and</span> <span word="exploding">exploding</span> <span word="due">due</span> <span word="to">to</span> <span word="the">the</span> <span word="unequal">unequal</span> <span word="pressure">pressure</span> <span word="on">on</span> <span word="the">the</span> <span word="leading">leading</span> <span word="side">side</span> <span word="vs">vs</span> <span word="the">the</span> <span word="trailing">trailing</span> <span word="side">side</span> (<span word="it">it</span> <span word="pancaked">pancaked</span> <span word="and">and</span> <span word="exploded">exploded</span>)," <span word="Yeomans">Yeomans</span> <span word="told">told</span> <span word="SPACE">SPACE</span>.<span word="com">com</span> <span word="in">in</span> <span word="an">an</span> <span word="email">email</span>. "<span word="It">It</span> <span word="is">is</span> <span word="far">far</span> <span word="too">too</span> <span word="early">early</span> <span word="to">to</span> <span word="provide">provide</span> <span word="estimates">estimates</span> <span word="of">of</span> <span word="the">the</span> <span word="energy">energy</span> <span word="released">released</span> <span word="or">or</span> <span word="provide">provide</span> <span word="a">a</span> <span word="reliable">reliable</span> <span word="estimate">estimate</span> <span word="of">of</span> <span word="the">the</span> <span word="original">original</span> <span word="size">size</span>."</p><p><span word="Yeoman">Yeoman</span> <span word="stressed">stressed</span> <span word="that">that</span> <span word="the">the</span> <span word="bolide">bolide</span> <span word="event">event</span> <span word="was">was</span> <span word="likely">likely</span> <span word="not">not</span> <span word="associated">associated</span> <span word="at">at</span> <span word="all">all</span> <span word="with">with</span> <span word="the">the</span> <span word="incoming">incoming</span> <span word="asteroid">asteroid</span> 2017 <span word="DA">DA</span>14, <span word="which">which</span> <span word="will">will</span> <span word="fly">fly</span> <span word="within">within</span> 17,200 <span word="miles">miles</span> (27,000 <span word="kilometers">kilometers</span>) <span word="of">of</span> <span word="Earth">Earth</span> <span word="when">when</span> <span word="it">it</span> <span word="passes">passes</span> <span word="safely">safely</span> <span word="by">by</span> <span word="our">our</span> <span word="planet">planet</span> <span word="today">today</span>.</p><p>"<span word="The">The</span> <span word="asteroid">asteroid</span> <span word="will">will</span> <span word="travel">travel</span> <span word="south">south</span> <span word="to">to</span> <span word="north">north</span>," <span word="Yeomans">Yeomans</span> <span word="said">said</span>. "<span word="The">The</span> <span word="bolide">bolide</span> <span word="trail">trail</span> <span word="was">was</span> <span word="not">not</span> <span word="south">south</span> <span word="to">to</span> <span word="north">north</span> <span word="and">and</span> <span word="the">the</span> <span word="separation">separation</span> <span word="in">in</span> <span word="time">time</span> <span word="between">between</span> <span word="the">the</span> <span word="fireball">fireball</span> <span word="and">and</span> 2017 <span word="DA">DA</span>14 <span word="close">close</span> <span word="approach">approach</span> <span word="is">is</span> <span word="significant">significant</span>."</p>
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