美国报废卫星今日将落向何处？
<p>正向地球袭来的美国报废卫星预计将于美国东部时间9月23日下午到达地球，但具体落地地点目前无从得知。不过美国宇航局表示，降落地点肯定不在北美。目前，美国宇航局和空军正在密切追踪这颗卫星及其毁灭轨道。科学家预计，将有26块大型碎片穿过地球大气层到达地球，降落到地面的卫星残片重量约1170镑（合532公斤）。科学家同时指出，碎片坠落范围大概为800公里，碎片击中人的几率约为三千二百分之一，但是落入城镇等人口密集地区的几率很小。美国宇航局提醒民众，如果真的看到疑似卫星碎片的物质，千万不要触碰，要及时与当地执法部门联系。</p><p><span word="A">A</span> <span word="dead">dead</span> <span word="NASA">NASA</span> <span word="satellite">satellite</span> <span word="will">will</span> <span word="plummet">plummet</span> <span word="to">to</span> <span word="Earth">Earth</span> <span word="on">on</span> <span word="Friday">Friday</span> (<span word="Sept">Sept</span>. 23), <span word="and">and</span> <span word="while">while</span> <span word="the">the</span> <span word="U">U</span>.<span word="S">S</span>. <span word="space">space</span> <span word="agency">agency</span> <span word="doesn">doesn</span>'<span word="t">t</span> <span word="know">know</span> <span word="exactly">exactly</span> <span word="where">where</span> <span word="pieces">pieces</span> <span word="of">of</span> <span word="the">the</span> <span word="massive">massive</span> <span word="spacecraft">spacecraft</span> <span word="will">will</span> <span word="hit">hit</span>, <span word="one">one</span> <span word="thing">thing</span> <span word="is">is</span> <span word="certain">certain</span>: <span word="North">North</span> <span word="America">America</span> <span word="is">is</span> <span word="in">in</span> <span word="the">the</span> <span word="clear">clear</span>.</p><p><span word="NASA">NASA</span>'<span word="s">s</span> <span word="Upper">Upper</span> <span word="Atmosphere">Atmosphere</span> <span word="Research">Research</span> <span word="Satellite">Satellite</span>, <span word="or">or</span> <span word="UARS">UARS</span>, <span word="is">is</span> <span word="set">set</span> <span word="to">to</span> <span word="make">make</span> <span word="an">an</span> <span word="uncontrolled">uncontrolled</span> <span word="re">re</span>-<span word="entry">entry</span> <span word="into">into</span> <span word="Earth">Earth</span>'<span word="s">s</span> <span word="atmosphere">atmosphere</span> <span word="on">on</span> <span word="Friday">Friday</span>. <span word="However">However</span>, <span word="it">it</span> <span word="is">is</span> <span word="still">still</span> <span word="too">too</span> <span word="early">early</span> <span word="to">to</span> <span word="tell">tell</span> <span word="exactly">exactly</span> <span word="where">where</span> <span word="the">the</span> 6.5-<span word="ton">ton</span> <span word="spacecraft">spacecraft</span> <span word="will">will</span> <span word="fall">fall</span>. <span word="Scientists">Scientists</span> <span word="will">will</span> <span word="likely">likely</span> <span word="have">have</span> <span word="a">a</span> <span word="much">much</span> <span word="better">better</span> <span word="idea">idea</span> <span word="of">of</span> <span word="where">where</span> <span word="the">the</span> <span word="debris">debris</span> <span word="will">will</span> <span word="land">land</span> <span word="about">about</span> <span word="two">two</span> <span word="hours">hours</span> <span word="before">before</span> <span word="the">the</span> <span word="impact">impact</span>, <span word="NASA">NASA</span> <span word="officials">officials</span> <span word="said">said</span>.</p><p><span word="But">But</span>, <span word="NASA">NASA</span> <span word="was">was</span> <span word="able">able</span> <span word="to">to</span> <span word="rule">rule</span> <span word="out">out</span> <span word="North">North</span> <span word="America">America</span> <span word="as">as</span> <span word="being">being</span> <span word="in">in</span> <span word="the">the</span> <span word="potential">potential</span> <span word="debris">debris</span> <span word="drop">drop</span> <span word="zone">zone</span>.</p><p>"<span word="Re">Re</span>-<span word="entry">entry</span> <span word="is">is</span> <span word="expected">expected</span> <span word="sometime">sometime</span> <span word="during">during</span> <span word="the">the</span> <span word="afternoon">afternoon</span> <span word="of">of</span> <span word="Sept">Sept</span>. 23, <span word="Eastern">Eastern</span> <span word="Daylight">Daylight</span> <span word="Time">Time</span>," <span word="agency">agency</span> <span word="officials">officials</span> <span word="said">said</span> <span word="in">in</span> <span word="a">a</span> <span word="statement">statement</span>. "<span word="The">The</span> <span word="satellite">satellite</span> <span word="will">will</span> <span word="not">not</span> <span word="be">be</span> <span word="passing">passing</span> <span word="over">over</span> <span word="North">North</span> <span word="America">America</span> <span word="during">during</span> <span word="that">that</span> <span word="time">time</span> <span word="period">period</span>. <span word="It">It</span> <span word="is">is</span> <span word="still">still</span> <span word="too">too</span> <span word="early">early</span> <span word="to">to</span> <span word="predict">predict</span> <span word="the">the</span> <span word="time">time</span> <span word="and">and</span> <span word="location">location</span> <span word="of">of</span> <span word="re">re</span>-<span word="entry">entry</span> <span word="with">with</span> <span word="any">any</span> <span word="more">more</span> <span word="certainty">certainty</span>, <span word="but">but</span> <span word="predictions">predictions</span> <span word="will">will</span> <span word="become">become</span> <span word="more">more</span> <span word="refined">refined</span> <span word="in">in</span> <span word="the">the</span> <span word="next">next</span> 24 <span word="to">to</span> 48 <span word="hours">hours</span>."</p>
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