六级阅读第31篇
<p> <span word="Suppose">Suppose</span> <span word="that">that</span> <span word="this">this</span> <span word="evening">evening</span> <span word="a">a</span> <span word="spaceship">spaceship</span> <span word="from">from</span> <span word="somewhere">somewhere</span> <span word="outside">outside</span> <span word="the">the</span> <span word="solar">solar</span> <span word="system">system</span> <span word="landed">landed</span> <span word="unnoticed">unnoticed</span> <span word="in">in</span> <span word="your">your</span> <span word="neighborhood">neighborhood</span>. <span word="Suppose">Suppose</span> <span word="you">you</span> <span word="saw">saw</span> <span word="three">three</span> <span word="beings">beings</span> <span word="from">from</span> <span word="that">that</span> <span word="ship">ship</span> <span word="walk">walk</span> <span word="down">down</span> <span word="the">the</span> <span word="road">road</span> <span word="in">in</span> <span word="front">front</span> <span word="of">of</span> <span word="your">your</span> <span word="house">house</span> <span word="at">at</span> <span word="dusk">dusk</span>. <span word="Would">Would</span> <span word="you">you</span> <span word="run">run</span> <span word="screaming">screaming</span> <span word="to">to</span> <span word="the">the</span> <span word="telephone">telephone</span> <span word="to">to</span> <span word="call">call</span> <span word="the">the</span> <span word="police">police</span>? <span word="No">No</span>, <span word="the">the</span> <span word="chances">chances</span> <span word="are">are</span> <span word="that">that</span> <span word="you">you</span> <span word="wouldnt">wouldnt</span> <span word="even">even</span> <span word="give">give</span> <span word="them">them</span> <span word="a">a</span> <span word="second">second</span> <span word="look">look</span>. <span word="We">We</span> <span word="can">can</span> <span word="be">be</span> <span word="almost">almost</span> <span word="certain">certain</span> <span word="that">that</span> <span word="our">our</span> <span word="visitors">visitors</span> <span word="from">from</span> <span word="space">space</span> <span word="will">will</span> <span word="not">not</span> <span word="have">have</span> <span word="three">three</span> <span word="eyes">eyes</span>, <span word="webbed">webbed</span> <span word="feet">feet</span>, <span word="or">or</span> <span word="television">television</span> <span word="antennae">antennae</span> <span word="growing">growing</span> <span word="out">out</span> <span word="of">of</span> <span word="their">their</span> <span word="foreheads">foreheads</span>. <span word="Instead">Instead</span>, <span word="scientists">scientists</span> <span word="theorize">theorize</span>, <span word="they">they</span> <span word="will">will</span> <span word="probably">probably</span> <span word="bear">bear</span> <span word="a">a</span> <span word="strong">strong</span> <span word="resemblance">resemblance</span> <span word="to">to</span> <span word="the">the</span> <span word="man">man</span> <span word="next">next</span> <span word="door">door</span>. <span word="The">The</span> <span word="reason">reason</span> <span word="we">we</span> <span word="can">can</span> <span word="make">make</span> <span word="this">this</span> <span word="assumption">assumption</span> <span word="is">is</span> <span word="that">that</span> <span word="science">science</span> <span word="has">has</span> <span word="shown">shown</span> <span word="that">that</span> <span word="the">the</span> <span word="shape">shape</span> <span word="of">of</span> <span word="a">a</span> <span word="living">living</span> <span word="body">body</span> <span word="is">is</span> <span word="not">not</span> <span word="accidental">accidental</span>. <span word="There">There</span> <span word="are">are</span> <span word="rules">rules</span> <span word="of">of</span> <span word="biological">biological</span> <span word="construction">construction</span> <span word="that">that</span> <span word="help">help</span> <span word="us">us</span> <span word="picture">picture</span> <span word="presumed">presumed</span> <span word="visitors">visitors</span> <span word="before">before</span> <span word="they">they</span> <span word="actually">actually</span> <span word="step">step</span> <span word="out">out</span> <span word="of">of</span> <span word="their">their</span> <span word="spaceship">spaceship</span>. <span word="In">In</span> <span word="applying">applying</span> <span word="the">the</span> <span word="rules">rules</span>, <span word="we">we</span> <span word="have">have</span> <span word="to">to</span> <span word="make">make</span> <span word="just">just</span> <span word="two">two</span> <span word="assumptions">assumptions</span>. <span word="The">The</span> <span word="first">first</span> <span word="is">is</span> <span word="that">that</span> <span word="the">the</span> <span word="bodies">bodies</span> <span word="of">of</span> <span word="spacemen">spacemen</span> <span word="consist">consist</span> <span word="of">of</span> <span word="protoplasm">protoplasm</span> <span word="like">like</span> <span word="ours">ours</span>. <span word="The">The</span> <span word="second">second</span> <span word="is">is</span> <span word="that">that</span> <span word="they">they</span> <span word="are">are</span> <span word="intelligent">intelligent</span>, <span word="which">which</span> <span word="is">is</span> <span word="an">an</span> <span word="inescapable">inescapable</span> <span word="fact">fact</span> <span word="once">once</span> <span word="we">we</span> <span word="accept">accept</span> <span word="the">the</span> <span word="idea">idea</span> <span word="that">that</span> <span word="they">they</span> <span word="are">are</span> <span word="capable">capable</span> <span word="of">of</span> <span word="building">building</span> <span word="a">a</span> <span word="spaceship">spaceship</span>. <span word="With">With</span> <span word="those">those</span> <span word="assumptions">assumptions</span> <span word="in">in</span> <span word="mind">mind</span>, <span word="we">we</span> <span word="can">can</span> <span word="paint">paint</span> <span word="this">this</span> <span word="portrait">portrait</span> <span word="of">of</span> <span word="the">the</span> <span word="man">man</span> <span word="from">from</span> <span word="Planet">Planet</span> <span word="X">X</span>. : <span word="He">He</span> <span word="breathes">breathes</span> <span word="air">air</span>. <span word="Water">Water</span> <span word="breathers">breathers</span> <span word="might">might</span> <span word="develop">develop</span> <span word="some">some</span> <span word="intelligence">intelligence</span>, <span word="but">but</span> <span word="they">they</span> <span word="could">could</span> <span word="not">not</span> <span word="smelt">smelt</span> <span word="metals">metals</span> <span word="under">under</span> <span word="water">water</span>. <span word="This">This</span> <span word="means">means</span> <span word="that">that</span> <span word="any">any</span> <span word="development">development</span> <span word="above">above</span> <span word="the">the</span> <span word="level">level</span> <span word="of">of</span> <span word="our">our</span> <span word="own">own</span> <span word="Stone">Stone</span> <span word="Age">Age</span> <span word="is">is</span> <span word="the">the</span> <span word="accomplishment">accomplishment</span> <span word="of">of</span> <span word="air">air</span> <span word="breathers">breathers</span>. <span word="He">He</span> <span word="eats">eats</span> <span word="both">both</span> <span word="plants">plants</span> <span word="and">and</span> <span word="meat">meat</span>. <span word="A">A</span> <span word="strict">strict</span> <span word="plant">plant</span>-<span word="eater">eater</span> <span word="spends">spends</span> <span word="too">too</span> <span word="much">much</span> <span word="time">time</span> <span word="stuffing">stuffing</span> <span word="himself">himself</span> <span word="with">with</span> <span word="food">food</span> <span word="to">to</span> <span word="build">build</span> <span word="the">the</span> <span word="kind">kind</span> <span word="of">of</span> <span word="civilization">civilization</span> <span word="which">which</span> <span word="is">is</span> <span word="necessary">necessary</span> <span word="to">to</span> <span word="produce">produce</span> <span word="a">a</span> <span word="spaceship">spaceship</span>. <span word="Animals">Animals</span> <span word="which">which</span> <span word="can">can</span> <span word="digest">digest</span> <span word="meat">meat</span> <span word="only">only</span> <span word="would">would</span> <span word="not">not</span> <span word="be">be</span> <span word="likely">likely</span> <span word="to">to</span> <span word="survive">survive</span> <span word="the">the</span> <span word="occasional">occasional</span> <span word="adverse">adverse</span> <span word="periods">periods</span> <span word="which">which</span> <span word="very">very</span> <span word="likely">likely</span> <span word="occur">occur</span> <span word="on">on</span> <span word="all">all</span> <span word="planets">planets</span> <span word="and">and</span> <span word="wipe">wipe</span> <span word="out">out</span> <span word="the">the</span> <span word="less">less</span> <span word="adaptable">adaptable</span> <span word="forms">forms</span> <span word="of">of</span> <span word="life">life</span>. <span word="Hes">Hes</span> <span word="probably">probably</span> <span word="not">not</span> <span word="much">much</span> <span word="larger">larger</span> <span word="than">than</span> <span word="the">the</span> <span word="largest">largest</span> <span word="human">human</span> <span word="being">being</span>. <span word="The">The</span> <span word="limiting">limiting</span> <span word="factor">factor</span> <span word="here">here</span> <span word="is">is</span> <span word="something">something</span> <span word="called">called</span> <span word="the">the</span> <span word="spare">spare</span>-<span word="cube">cube</span> <span word="law">law</span>. <span word="If">If</span> <span word="you">you</span> <span word="double">double</span> <span word="the">the</span> <span word="height">height</span> <span word="of">of</span> <span word="a">a</span>, <span word="person">person</span> <span word="without">without</span> <span word="changing">changing</span> <span word="his">his</span> <span word="proportions">proportions</span>, <span word="you">you</span> <span word="have">have</span> <span word="a">a</span> <span word="being">being</span> <span word="with">with</span> <span word="weight">weight</span> <span word="times">times</span> <span word="the">the</span> <span word="weight">weight</span>. <span word="This">This</span> <span word="means">means</span> <span word="that">that</span> <span word="a">a</span> <span word="person">person</span> 12 <span word="feet">feet</span> <span word="tall">tall</span>, <span word="for">for</span> <span word="example">example</span>, <span word="must">must</span> <span word="be">be</span> <span word="clumsy">clumsy</span> <span word="and">and</span> <span word="cannot">cannot</span> <span word="perform">perform</span> <span word="precision">precision</span> <span word="work">work</span>. <span word="And">And</span> <span word="precision">precision</span> <span word="work">work</span> <span word="will">will</span> <span word="be">be</span> <span word="essential">essential</span>, <span word="of">of</span> <span word="course">course</span>, <span word="in">in</span> <span word="building">building</span> <span word="the">the</span> <span word="spaceship">spaceship</span>. <span word="He">He</span> <span word="weighs">weighs</span> <span word="at">at</span> <span word="least">least</span> 40 <span word="pounds">pounds</span>, <span word="and">and</span> <span word="probably">probably</span> <span word="more">more</span>. <span word="A">A</span> <span word="brain">brain</span> <span word="of">of</span> <span word="a">a</span> <span word="certain">certain</span> <span word="size">size</span> <span word="and">and</span> <span word="complexity">complexity</span> <span word="would">would</span> <span word="be">be</span> <span word="required">required</span> <span word="for">for</span> <span word="the">the</span> <span word="building">building</span> <span word="of">of</span> <span word="a">a</span> <span word="spaceship">spaceship</span>. <span word="The">The</span> <span word="brain">brain</span> <span word="of">of</span> <span word="our">our</span> <span word="spacemen">spacemen</span> <span word="would">would</span> <span word="weigh">weigh</span> <span word="at">at</span> <span word="least">least</span> 2 <span word="pounds">pounds</span>. <span word="And">And</span> <span word="from">from</span> <span word="our">our</span> <span word="studies">studies</span> <span word="of">of</span> <span word="animals">animals</span> <span word="on">on</span> <span word="earth">earth</span>, <span word="we">we</span> <span word="know">know</span> <span word="that">that</span> <span word="a">a</span> <span word="body">body</span> <span word="weighing">weighing</span> <span word="at">at</span> <span word="least">least</span> 40 <span word="pounds">pounds</span> <span word="is">is</span> <span word="required">required</span> <span word="to">to</span> <span word="support">support</span> <span word="a">a</span> 2-<span word="pound">pound</span> <span word="brain">brain</span>. <span word="He">He</span> <span word="has">has</span> <span word="a">a</span> <span word="skull">skull</span> <span word="of">of</span> <span word="some">some</span> <span word="kind">kind</span>. <span word="The">The</span> <span word="most">most</span> <span word="valuable">valuable</span> <span word="organ">organ</span> <span word="of">of</span> <span word="an">an</span> <span word="intelligent">intelligent</span> <span word="being">being</span> <span word="is">is</span> <span word="his">his</span> <span word="brain">brain</span>, <span word="and">and</span> <span word="his">his</span> <span word="brain">brain</span> <span word="must">must</span> <span word="be">be</span> <span word="protected">protected</span> <span word="in">in</span> <span word="some">some</span> <span word="manner">manner</span> <span word="against">against</span> <span word="injury">injury</span>. <span word="He">He</span> <span word="has">has</span> <span word="two">two</span> <span word="eyes">eyes</span> <span word="and">and</span> <span word="ears">ears</span>. <span word="The">The</span> <span word="three">three</span>-<span word="eyed">eyed</span> <span word="man">man</span> <span word="from">from</span> <span word="space">space</span> <span word="is">is</span> <span word="not">not</span> <span word="a">a</span> <span word="very">very</span> <span word="likely">likely</span> <span word="creation">creation</span>. <span word="Two">Two</span> <span word="eyes">eyes</span> <span word="are">are</span> <span word="better">better</span> <span word="than">than</span> <span word="one">one</span> <span word="for">for</span> <span word="the">the</span> <span word="purpose">purpose</span> <span word="of">of</span> <span word="judging">judging</span> <span word="distance">distance</span> <span word="and">and</span> <span word="shape">shape</span>, <span word="but">but</span> <span word="three">three</span> <span word="would">would</span> <span word="not">not</span> <span word="be">be</span> <span word="better">better</span> <span word="than">than</span> <span word="two">two</span>. <span word="The">The</span> <span word="same">same</span> <span word="goes">goes</span> <span word="for">for</span> <span word="ears">ears</span>. <span word="More">More</span> <span word="eyes">eyes</span> <span word="and">and</span> <span word="ears">ears</span> <span word="would">would</span> <span word="be">be</span> <span word="useful">useful</span> <span word="as">as</span> <span word="spares">spares</span> <span word="in">in</span> <span word="case">case</span> <span word="of">of</span> <span word="accidents">accidents</span> <span word="but">but</span> <span word="earth">earth</span> <span word="organisms">organisms</span>, <span word="at">at</span> <span word="least">least</span>, <span word="do">do</span> <span word="not">not</span> <span word="run">run</span> <span word="to">to</span> <span word="spares">spares</span>. <span word="We">We</span> <span word="do">do</span> <span word="not">not</span> <span word="know">know</span> <span word="the">the</span> <span word="reason">reason</span> <span word="for">for</span> <span word="this">this</span> <span word="but">but</span> <span word="it">it</span> <span word="is">is</span> <span word="logical">logical</span> <span word="to">to</span> <span word="assume">assume</span> <span word="that">that</span> <span word="life">life</span> <span word="on">on</span> <span word="other">other</span> <span word="planets">planets</span> <span word="would">would</span> <span word="not">not</span> <span word="have">have</span> <span word="developed">developed</span> <span word="along">along</span> <span word="different">different</span> <span word="lines">lines</span>. <span word="The">The</span> <span word="eyes">eyes</span> <span word="and">and</span> <span word="ears">ears</span> <span word="are">are</span> <span word="near">near</span> <span word="the">the</span> <span word="brain">brain</span>. <span word="Information">Information</span> <span word="gathered">gathered</span> <span word="by">by</span> <span word="eyes">eyes</span> <span word="and">and</span> <span word="ears">ears</span> <span word="must">must</span> <span word="reach">reach</span> <span word="the">the</span> <span word="brain">brain</span> <span word="quickly">quickly</span> <span word="in">in</span> <span word="order">order</span> <span word="to">to</span> <span word="be">be</span> <span word="useful">useful</span>. <span word="This">This</span> <span word="transmission">transmission</span> <span word="by">by</span> <span word="the">the</span> <span word="nerves">nerves</span> <span word="is">is</span> <span word="slow">slow</span>. <span word="Therefore">Therefore</span> <span word="the">the</span> <span word="sense">sense</span> <span word="organs">organs</span> <span word="must">must</span> <span word="be">be</span> <span word="close">close</span> <span word="to">to</span> <span word="the">the</span> <span word="brain">brain</span> <span word="to">to</span> <span word="shorten">shorten</span> <span word="the">the</span> <span word="time">time</span> <span word="lag">lag</span> <span word="between">between</span> <span word="information">information</span> <span word="and">and</span> <span word="reaction">reaction</span>. <span word="He">He</span> <span word="has">has</span> <span word="hands">hands</span> <span word="and">and</span> <span word="feet">feet</span>. <span word="We">We</span> <span word="know">know</span> <span word="that">that</span> <span word="our">our</span> <span word="spacemen">spacemen</span> <span word="will">will</span> <span word="walk">walk</span> <span word="erect">erect</span>. <span word="In">In</span> <span word="order">order</span> <span word="to">to</span> <span word="survive">survive</span>, <span word="any">any</span> <span word="being">being</span> <span word="must">must</span> <span word="be">be</span> <span word="able">able</span> <span word="to">to</span> <span word="move">move</span> <span word="around">around</span>. <span word="But">But</span> <span word="in">in</span> <span word="order">order</span> <span word="to">to</span> <span word="build">build</span> <span word="he">he</span> <span word="would">would</span> <span word="need">need</span> <span word="something">something</span> <span word="resembling">resembling</span> <span word="our">our</span> <span word="hands">hands</span>. <span word="Somewhere">Somewhere</span> <span word="along">along</span> <span word="the">the</span> <span word="line">line</span> <span word="of">of</span> <span word="his">his</span> <span word="development">development</span> <span word="he">he</span> <span word="would">would</span> <span word="have">have</span> <span word="had">had</span> <span word="to">to</span> <span word="free">free</span> <span word="one">one</span> <span word="pair">pair</span> <span word="of">of</span> <span word="legs">legs</span> <span word="to">to</span> <span word="allow">allow</span> <span word="them">them</span> <span word="to">to</span> <span word="become">become</span> <span word="hands">hands</span>. <span word="The">The</span> <span word="only">only</span> <span word="way">way</span> <span word="to">to</span> <span word="do">do</span> <span word="this">this</span> <span word="is">is</span> <span word="to">to</span> <span word="learn">learn</span> <span word="to">to</span> <span word="stand">stand</span>. <span word="Also">Also</span>, <span word="it">it</span> <span word="is">is</span> <span word="almost">almost</span> <span word="certain">certain</span> <span word="that">that</span> <span word="once">once</span> <span word="on">on</span> <span word="his">his</span> <span word="back">back</span> <span word="legs">legs</span> <span word="he">he</span> <span word="would">would</span> <span word="develop">develop</span> <span word="bending">bending</span> <span word="fingers">fingers</span> <span word="and">and</span> <span word="a">a</span> <span word="thumb">thumb</span>. <span word="To">To</span> <span word="produce">produce</span> <span word="a">a</span> <span word="high">high</span> <span word="state">state</span> <span word="of">of</span> <span word="development">development</span> <span word="he">he</span> <span word="would">would</span> <span word="need">need</span> <span word="to">to</span> <span word="pick">pick</span> <span word="up">up</span> <span word="things">things</span>, <span word="to">to</span> <span word="be">be</span> <span word="able">able</span> <span word="to">to</span> <span word="grasp">grasp</span>, <span word="hold">hold</span>, <span word="push">push</span> <span word="and">and</span> <span word="pull">pull</span>. <span word="Why">Why</span> <span word="not">not</span> <span word="tentacles">tentacles</span> , <span word="such">such</span> <span word="as">as</span> <span word="on">on</span> <span word="an">an</span> <span word="octopus">octopus</span>? <span word="Because">Because</span> <span word="tentacles">tentacles</span> <span word="can">can</span> <span word="pull">pull</span> <span word="but">but</span> <span word="cannot">cannot</span> <span word="push">push</span> <span word="effectively">effectively</span>. <span word="Now">Now</span> <span word="that">that</span> <span word="weve">weve</span> <span word="drawn">drawn</span> <span word="a">a</span> <span word="rough">rough</span> <span word="portrait">portrait</span> <span word="of">of</span> <span word="the">the</span> <span word="Man">Man</span> <span word="from">from</span> <span word="Planet">Planet</span> <span word="X">X</span>, <span word="is">is</span> <span word="there">there</span> <span word="anything">anything</span> <span word="we">we</span> <span word="can">can</span> <span word="guess">guess</span> <span word="about">about</span> <span word="Planet">Planet</span> <span word="X">X</span> <span word="itself">itself</span>? ? 108 ? <span word="Here">Here</span> <span word="again">again</span> <span word="the">the</span> <span word="answer">answer</span> <span word="is">is</span> <span word="a">a</span> <span word="familiar">familiar</span> <span word="one">one</span>; <span word="his">his</span> <span word="planet">planet</span> <span word="is">is</span> <span word="probably">probably</span> <span word="very">very</span> <span word="much">much</span> <span word="like">like</span> <span word="ours">ours</span>. <span word="We">We</span> <span word="would">would</span> <span word="probably">probably</span> <span word="be">be</span> <span word="able">able</span> <span word="to">to</span> <span word="live">live</span> <span word="on">on</span> <span word="it">it</span>. <span word="First">First</span> <span word="of">of</span> <span word="all">all</span>, <span word="Planet">Planet</span> <span word="X">X</span> <span word="cant">cant</span> <span word="be">be</span> <span word="much">much</span> <span word="larger">larger</span> <span word="or">or</span> <span word="much">much</span> <span word="smaller">smaller</span> <span word="than">than</span> <span word="the">the</span> <span word="earth">earth</span>. <span word="If">If</span> <span word="it">it</span> <span word="were">were</span> <span word="much">much</span> <span word="bigger">bigger</span>, <span word="the">the</span> <span word="gravity">gravity</span> <span word="would">would</span> <span word="be">be</span> <span word="so">so</span> <span word="crushingly">crushingly</span> <span word="great">great</span> <span word="that">that</span> <span word="life">life</span> <span word="would">would</span> <span word="never">never</span> <span word="even">even</span> <span word="get">get</span> <span word="started">started</span>. <span word="If">If</span> <span word="it">it</span> <span word="were">were</span> <span word="too">too</span> <span word="small">small</span>, <span word="it">it</span> <span word="would">would</span> <span word="not">not</span> <span word="have">have</span> <span word="sufficient">sufficient</span> <span word="gravitational">gravitational</span> <span word="pull">pull</span> <span word="to">to</span> <span word="hang">hang</span> <span word="on">on</span> <span word="to">to</span> <span word="its">its</span> <span word="gases">gases</span> <span word="and">and</span> <span word="there">there</span> <span word="would">would</span> <span word="be">be</span> <span word="no">no</span> <span word="air">air</span> <span word="to">to</span> <span word="breathe">breathe</span>. <span word="The">The</span> <span word="planets">planets</span> <span word="atmosphere">atmosphere</span> <span word="would">would</span> <span word="be">be</span> <span word="much">much</span> <span word="like">like</span> <span word="ours">ours</span>. <span word="There">There</span> <span word="are">are</span> <span word="only">only</span> <span word="two">two</span> <span word="chemical">chemical</span> <span word="combinations">combinations</span> <span word="that">that</span> <span word="are">are</span> <span word="complex">complex</span> <span word="enough">enough</span> <span word="to">to</span> <span word="support">support</span> <span word="life">life</span>: <span word="the">the</span> <span word="carbon">carbon</span>-<span word="oxygen">oxygen</span>-<span word="hydrogen">hydrogen</span> <span word="cycle">cycle</span> <span word="we">we</span> <span word="live">live</span> <span word="on">on</span>, <span word="and">and</span> <span word="the">the</span> <span word="chlorine">chlorine</span>-<span word="fluoride">fluoride</span> , <span word="methane">methane</span> <span word="cycle">cycle</span>. <span word="The">The</span> <span word="latter">latter</span> <span word="is">is</span> <span word="a">a</span> <span word="highly">highly</span> <span word="explosive">explosive</span> <span word="mixture">mixture</span> <span word="and">and</span> <span word="though">though</span> <span word="it">it</span> <span word="is">is</span> <span word="conceivable">conceivable</span> <span word="that">that</span> <span word="somewhere">somewhere</span> <span word="there">there</span> <span word="could">could</span> <span word="be">be</span> <span word="a">a</span> <span word="life">life</span>-<span word="form">form</span> <span word="living">living</span> <span word="on">on</span> <span word="it">it</span>, <span word="it">it</span> <span word="is">is</span> <span word="not">not</span> <span word="likely">likely</span>. <span word="This">This</span> <span word="cycle">cycle</span> <span word="is">is</span> <span word="so">so</span> <span word="complex">complex</span> <span word="that">that</span> <span word="the">the</span> <span word="chances">chances</span> <span word="are">are</span> <span word="heavily">heavily</span> <span word="in">in</span> <span word="favor">favor</span> <span word="of">of</span> <span word="oxygen">oxygen</span>-<span word="based">based</span> <span word="life">life</span> <span word="developing">developing</span> <span word="long">long</span> <span word="before">before</span> <span word="the">the</span> <span word="chlorine">chlorine</span>-<span word="based">based</span> <span word="form">form</span> <span word="of">of</span> <span word="got">got</span> <span word="a">a</span> <span word="chance">chance</span>. <span word="Planet">Planet</span> <span word="X">X</span> <span word="would">would</span> <span word="have">have</span> <span word="land">land</span> <span word="and">and</span> <span word="sea">sea</span> <span word="masses">masses</span> <span word="and">and</span> <span word="a">a</span> <span word="climate">climate</span> <span word="with">with</span> <span word="drastic">drastic</span> <span word="changes">changes</span> <span word="like">like</span> <span word="ours">ours</span>. <span word="If">If</span> <span word="the">the</span> <span word="climate">climate</span> <span word="were">were</span> <span word="static">static</span> <span word="there">there</span> <span word="would">would</span> <span word="be">be</span> <span word="no">no</span> <span word="incentive">incentive</span> <span word="for">for</span> <span word="our">our</span> <span word="visitors">visitors</span> <span word="race">race</span> <span word="to">to</span> <span word="build">build</span> <span word="anything">anything</span>. <span word="Variable">Variable</span> <span word="hot">hot</span> <span word="and">and</span> <span word="cold">cold</span>, <span word="wet">wet</span> <span word="and">and</span> <span word="dry">dry</span> <span word="seasons">seasons</span> <span word="are">are</span> <span word="needed">needed</span> <span word="to">to</span> <span word="push">push</span> <span word="him">him</span> <span word="around">around</span>. <span word="And">And</span>, <span word="of">of</span> <span word="course">course</span>, <span word="there">there</span> <span word="would">would</span> <span word="have">have</span> <span word="to">to</span> <span word="be">be</span> <span word="land">land</span> <span word="for">for</span> <span word="our">our</span> <span word="spaceman">spaceman</span> <span word="to">to</span> <span word="live">live</span> <span word="on">on</span> <span word="and">and</span> <span word="water">water</span> <span word="for">for</span> <span word="him">him</span> <span word="to">to</span> <span word="drink">drink</span>. <span word="All">All</span> <span word="this">this</span> <span word="tells">tells</span> <span word="that">that</span> <span word="our">our</span> <span word="visitor">visitor</span> <span word="is">is</span> <span word="from">from</span> <span word="outside">outside</span> <span word="our">our</span> <span word="solar">solar</span> <span word="system">system</span>, <span word="since">since</span> <span word="none">none</span> <span word="of">of</span> <span word="our">our</span> <span word="suns">suns</span> <span word="planets">planets</span>, <span word="besides">besides</span> <span word="the">the</span> <span word="earth">earth</span>, <span word="is">is</span> <span word="capable">capable</span> <span word="of">of</span> <span word="supporting">supporting</span> <span word="intelligent">intelligent</span> <span word="life">life</span>. <span word="It">It</span> <span word="also">also</span> <span word="tells">tells</span> <span word="us">us</span> <span word="something">something</span> <span word="else">else</span>: <span word="our">our</span> <span word="space">space</span> <span word="visitor">visitor</span> <span word="is">is</span> <span word="a">a</span> <span word="good">good</span> <span word="bit">bit</span> <span word="more">more</span> <span word="advanced">advanced</span> <span word="than">than</span> <span word="we">we</span> <span word="are">are</span>. <span word="Whether">Whether</span> <span word="it">it</span> <span word="is">is</span> <span word="because">because</span> <span word="his">his</span> <span word="race">race</span> <span word="is">is</span> <span word="more">more</span> <span word="intelligent">intelligent</span>, <span word="or">or</span> <span word="just">just</span> <span word="because">because</span> <span word="Planet">Planet</span> <span word="X">X</span> <span word="is">is</span> <span word="older">older</span> <span word="than">than</span> <span word="the">the</span> <span word="earth">earth</span> <span word="and">and</span> <span word="he">he</span> <span word="has">has</span> <span word="had">had</span> <span word="more">more</span> <span word="time">time</span> <span word="to">to</span> <span word="develop">develop</span>, <span word="we">we</span> <span word="cannot">cannot</span> <span word="tell">tell</span>. <span word="But">But</span> <span word="the">the</span> <span word="fact">fact</span> <span word="is">is</span> <span word="that">that</span> <span word="he">he</span> <span word="has">has</span> <span word="come">come</span> <span word="from">from</span> <span word="outer">outer</span> <span word="space">space</span>. <span word="The">The</span> <span word="nearest">nearest</span> <span word="star">star</span> <span word="system">system</span> <span word="to">to</span> <span word="us">us</span> <span word="is">is</span> <span word="Alpha">Alpha</span> <span word="Centauri">Centauri</span>, <span word="four">four</span> <span word="light">light</span>-<span word="years">years</span> <span word="away">away</span>. <span word="So">So</span> <span word="our">our</span> <span word="visitor">visitor</span> <span word="has">has</span> <span word="come">come</span> <span word="a">a</span> <span word="minimum">minimum</span> <span word="of">of</span> <span word="four">four</span> <span word="light">light</span>-<span word="years">years</span>. <span word="Our">Our</span> <span word="science">science</span>, <span word="just">just</span> <span word="on">on</span> <span word="the">the</span> <span word="edge">edge</span> <span word="of">of</span> <span word="interplanetary">interplanetary</span> <span word="flight">flight</span>, <span word="couldnt">couldnt</span> <span word="even">even</span> <span word="begin">begin</span> <span word="to">to</span> <span word="tackle">tackle</span> <span word="such">such</span> <span word="an">an</span> <span word="interstellar">interstellar</span> <span word="voyage">voyage</span>. <span word="We">We</span> <span word="would">would</span> <span word="have">have</span> <span word="a">a</span> <span word="lot">lot</span> <span word="to">to</span> <span word="learn">learn</span> <span word="from">from</span> <span word="such">such</span> <span word="a">a</span> <span word="visitor">visitor</span>. </p>
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