跟外星人说Hello会终结人类文明？
<p><span word="Are">Are</span> <span word="we">we</span> <span word="alone">alone</span> <span word="in">in</span> <span word="the">the</span> <span word="universe">universe</span>? <span word="It">It</span>’<span word="s">s</span> <span word="a">a</span> <span word="question">question</span> <span word="astronomers">astronomers</span> <span word="have">have</span> <span word="pondered">pondered</span> <span word="ever">ever</span> <span word="since">since</span> <span word="we">we</span> <span word="discovered">discovered</span> <span word="Earth">Earth</span> <span word="was">was</span> <span word="not">not</span> <span word="the">the</span> <span word="only">only</span> <span word="planet">planet</span> <span word="in">in</span> <span word="the">the</span> <span word="cosmos">cosmos</span>.我们是宇宙中唯一的智慧生命吗？自发现地球并非宇宙中唯一的星球以来，这个问题就一直盘桓在天文学家们的脑海之中。</p><p><span word="But">But</span>, <span word="while">while</span> <span word="we">we</span> <span word="conduct">conduct</span> <span word="searches">searches</span> <span word="for">for</span> <span word="habitable">habitable</span> <span word="planets">planets</span> <span word="and">and</span> <span word="even">even</span> <span word="signals">signals</span> <span word="from">from</span> <span word="an">an</span> <span word="intelligent">intelligent</span> <span word="race">race</span>, <span word="some">some</span> <span word="experts">experts</span> <span word="have">have</span> <span word="warned">warned</span> <span word="making">making</span> <span word="first">first</span> <span word="contact">contact</span> <span word="could">could</span> <span word="be">be</span> <span word="disastrous">disastrous</span>.</p><p>但是，当我们寻找可居住星球以及其他智慧生命时，一些专家警告道，尝试进行第一次接触可能引发灾难。</p><p><span word="They">They</span> <span word="say">say</span> <span word="that">that</span> <span word="if">if</span> <span word="we">we</span> <span word="were">were</span> <span word="to">to</span> <span word="broadcast">broadcast</span> <span word="our">our</span> <span word="position">position</span>, <span word="it">it</span> <span word="could">could</span> <span word="invite">invite</span> <span word="a">a</span> <span word="hostile">hostile</span> <span word="alien">alien</span> <span word="race">race</span> <span word="to">to</span> <span word="our">our</span> <span word="doorstep">doorstep</span> - <span word="and">and</span> <span word="ultimately">ultimately</span> <span word="spell">spell</span> <span word="the">the</span> <span word="end">end</span> <span word="of">of</span> <span word="civilisation">civilisation</span>.</p><p>他们认为，如果我们公开了所处位置，就有可能把有敌意的外星生物引到家门口，最后导致人类文明的终结。</p><p><span word="The">The</span> <span word="latest">latest</span> <span word="data">data</span> <span word="collected">collected</span> <span word="by">by</span> <span word="Nasa">Nasa</span> <span word="and">and</span> <span word="other">other</span> <span word="space">space</span> <span word="agencies">agencies</span> <span word="suggests">suggests</span> <span word="there">there</span> <span word="could">could</span> <span word="be">be</span> <span word="as">as</span> <span word="many">many</span> <span word="as">as</span> 40 <span word="billion">billion</span> <span word="potentially">potentially</span> <span word="habitable">habitable</span> <span word="planets">planets</span> <span word="in">in</span> <span word="our">our</span> <span word="galaxy">galaxy</span>, <span word="the">the</span> <span word="Milky">Milky</span> <span word="Way">Way</span>.</p><p>据美国国家航空航天局（<span word="Nasa">Nasa</span>）和其他宇航机构最新收集的数据表明，在银河系，有多达400亿个潜在的可居住星球。</p><p><span word="Proponents">Proponents</span> <span word="of">of</span> <span word="Seti">Seti</span> (<span word="Search">Search</span> <span word="for">for</span> <span word="Extraterrestrial">Extraterrestrial</span> <span word="Intelligence">Intelligence</span>) <span word="have">have</span> <span word="said">said</span> <span word="we">we</span> <span word="should">should</span> <span word="consider">consider</span> <span word="Active">Active</span> <span word="Seti">Seti</span> - <span word="sending">sending</span> <span word="out">out</span> <span word="messages">messages</span>, <span word="rather">rather</span> <span word="than">than</span> <span word="just">just</span> <span word="listening">listening</span>, <span word="in">in</span> <span word="the">the</span> <span word="hope">hope</span> <span word="someone">someone</span> <span word="is">is</span> <span word="out">out</span> <span word="there">there</span>.</p>
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