“外星人说”之我见1
<p>茫茫的宇宙空间到底存在不存在“外星人”？对于这个问题，我的回答是肯定的。</p><p><span word="Is">Is</span> <span word="there">there</span> <span word="any">any</span> "<span word="alien">alien</span>" <span word="in">in</span> <span word="the">the</span> <span word="vast">vast</span> <span word="space">space</span>? <span word="My">My</span> <span word="answer">answer</span> <span word="to">to</span> <span word="this">this</span> <span word="question">question</span> <span word="is">is</span> <span word="yes">yes</span>.</p><p>因为从生命的起源来看，只要在合适的恒星系统中的一颗条件温和的行星上，产生一定的化学反应即可产生原始的生命。据科学研究推测，这种现象不只是地球上的特有，在整个宇宙空间中绝对会有不少这样的现象。着名天文学家弗兰克·德瑞克早在1961年就提出了一个推断外星生命的方程式，我们通常叫它为“德瑞克方程式”。“德瑞克方程式”现在已经得到全世界很多天文学家的认可。通过“德瑞克方程式”的计算，天文学家们乐观地推断出，仅在银河系中就存在着大量的可能孕育着智能生命的星体。有人甚至明确断言，银河系中就有100万颗左右的行星上可能有生命诞生，而且每颗行星上的生命处于不同的进化阶段。因此，就更不用说离我们更远的其它星系上有智能生命存在的可能了。</p><p><span word="Because">Because</span> <span word="from">from</span> <span word="the">the</span> <span word="origin">origin</span> <span word="of">of</span> <span word="life">life</span>, <span word="as">as</span> <span word="long">long</span> <span word="as">as</span> <span word="there">there</span> <span word="is">is</span> <span word="a">a</span> <span word="certain">certain</span> <span word="chemical">chemical</span> <span word="reaction">reaction</span> <span word="on">on</span> <span word="a">a</span> <span word="moderate">moderate</span> <span word="planet">planet</span> <span word="in">in</span> <span word="a">a</span> <span word="suitable">suitable</span> <span word="star">star</span> <span word="system">system</span>, <span word="primitive">primitive</span> <span word="life">life</span> <span word="can">can</span> <span word="be">be</span> <span word="generated">generated</span>. <span word="According">According</span> <span word="to">to</span> <span word="scientific">scientific</span> <span word="research">research</span>, <span word="this">this</span> <span word="kind">kind</span> <span word="of">of</span> <span word="phenomenon">phenomenon</span> <span word="is">is</span> <span word="not">not</span> <span word="only">only</span> <span word="unique">unique</span> <span word="on">on</span> <span word="the">the</span> <span word="earth">earth</span>, <span word="there">there</span> <span word="will">will</span> <span word="definitely">definitely</span> <span word="be">be</span> <span word="many">many</span> <span word="such">such</span> <span word="phenomena">phenomena</span> <span word="in">in</span> <span word="the">the</span> <span word="whole">whole</span> <span word="space">space</span>. <span word="As">As</span> <span word="early">early</span> <span word="as">as</span> 1961, <span word="the">the</span> <span word="famous">famous</span> <span word="astronomer">astronomer</span> <span word="Frank">Frank</span> <span word="derrick">derrick</span> <span word="proposed">proposed</span> <span word="an">an</span> <span word="equation">equation</span> <span word="for">for</span> <span word="inferring">inferring</span> <span word="extraterrestrial">extraterrestrial</span> <span word="life">life</span>, <span word="which">which</span> <span word="we">we</span> <span word="usually">usually</span> <span word="call">call</span> "<span word="derrick">derrick</span> <span word="equation">equation</span>". <span word="The">The</span> "<span word="derrick">derrick</span> <span word="equation">equation</span>" <span word="has">has</span> <span word="now">now</span> <span word="been">been</span> <span word="recognized">recognized</span> <span word="by">by</span> <span word="many">many</span> <span word="astronomers">astronomers</span> <span word="all">all</span> <span word="over">over</span> <span word="the">the</span> <span word="world">world</span>. <span word="Based">Based</span> <span word="on">on</span> <span word="the">the</span> <span word="calculation">calculation</span> <span word="of">of</span> <span word="derrick">derrick</span>'<span word="s">s</span> <span word="equation">equation</span>, <span word="astronomers">astronomers</span> <span word="optimistically">optimistically</span> <span word="infer">infer</span> <span word="that">that</span> <span word="there">there</span> <span word="are">are</span> <span word="a">a</span> <span word="large">large</span> <span word="number">number</span> <span word="of">of</span> <span word="stars">stars</span> <span word="in">in</span> <span word="the">the</span> <span word="galaxy">galaxy</span> <span word="alone">alone</span> <span word="that">that</span> <span word="may">may</span> <span word="be">be</span> <span word="breeding">breeding</span> <span word="intelligent">intelligent</span> <span word="life">life</span>. <span word="It">It</span> <span word="has">has</span> <span word="even">even</span> <span word="been">been</span> <span word="explicitly">explicitly</span> <span word="asserted">asserted</span> <span word="that">that</span> <span word="about">about</span> <span word="one">one</span> <span word="million">million</span> <span word="planets">planets</span> <span word="in">in</span> <span word="the">the</span> <span word="galaxy">galaxy</span> <span word="may">may</span> <span word="have">have</span> <span word="life">life</span>, <span word="and">and</span> <span word="that">that</span> <span word="life">life</span> <span word="on">on</span> <span word="each">each</span> <span word="planet">planet</span> <span word="is">is</span> <span word="at">at</span> <span word="a">a</span> <span word="different">different</span> <span word="stage">stage</span> <span word="of">of</span> <span word="evolution">evolution</span>. <span word="So">So</span>, <span word="let">let</span> <span word="alone">alone</span> <span word="the">the</span> <span word="possibility">possibility</span> <span word="of">of</span> <span word="intelligent">intelligent</span> <span word="life">life</span> <span word="in">in</span> <span word="other">other</span> <span word="galaxies">galaxies</span> <span word="farther">farther</span> <span word="away">away</span> <span word="from">from</span> <span word="us">us</span>.</p>
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