2009年6月六级阅读答案(2010六级阅读)

Ourgalaxyisagiganticagglomerationofstarsandplanetswhosenumberswillprobablyneverbeenknown.Currentlyweestimatethisnumbertobeaboutthirtybillion.Scientistshaveestimatedthatthediameterofourgalaxy,ifitweretobetraveled,wouldtakeusaboutfiftythousandlightyearsandthethicknesstobeaboutfifteentotwentylightyears. 　

　　WeliveinsmallpartoftheMilkyWayGalaxy,whichisreferredtoasasolarsystem.Oursolarsystemismadeupofnineplanetsand31moons,whichorbitthecenterofgalaxy.AtthecenterofourgalaxyisourSun,whichisapproximatelytwenty-fivethousandlightyearsfromoursolarsystem.

　　TheseninemajorplanetsinorderfromthecenterareMercury,Venus,Earth,Mars,Jupiter,Saturn,Uranus,Neptune,andPluto.

　　MercuryistheplanetnearesttotheSun.AsitorbitstheSun,itdoesnotrotate,keepingthesamefaceoftheplanettowardtheSunatalltimes.Thismeansthatonesideoftheplanethasacontinualburningdayof900°F,andtheothersideacontinualnightandadeadlycoldof450°Fbelowzero.MercuryisthefastesttravelingofthenineplanetsmakingonefullorbitaroundtheSuninonlyeightdays.Lifeonmercurywouldbeimpossible.Ifyoucouldlivewherethenightmeetsthedayandsurvivetheextremeconditions,youwouldneeddarkgogglestoprotectyoueyesfromtheextremelight.Mercuryhaslittleornoatmospheretodiffusethesunlight.Youwouldalsoweighconsiderablelessduetothelackofgravity.Apersonweighting100poundsonEarthwouldweigh27poundsonMercury.

　　LookingintothenightskyyouwillnoticeVenus,thebrighteststarinthesky,andthesecondplanetfromtheSun.VenuscanonlybeseenatcertaintimesofthedayeitheratdawnoratSunset.Inphysicalcharacteristics,Venusismostlikeearthwithadiameterofseventhousandsixhundredmiles,andgravitythesameasearth.Itislocatedadistanceofsixty-sevenmillionmilesfromtheSunandmakesonecompleteorbitaroundtheSunintwohundredtwentyfivedays.AsingledayonVenuscanlastuptotwohundredandtwentyfiveearthdaysduetoitsslowrotation.Theatmosphereappearstoconsistofmostlynitrogenandcarbondioxide.Thisisduetothelackoflifeontheplanet.

　　ThebesttimetoviewVenuscomeseveryonehundredandtwentyyearsasitpassesbetweentheEarthandtheSun.ThelasttimetobestviewitwasonJune7,2004.

　　Earth,thethirdplanetformtheSunisourhomeplanet.Earthistheonlyplanetinoursolarsystemknowntosustainlife.Underthelayerofatmospherethatsurroundstheplanetweareabletoprovideallthenecessarycomponentstomakelifesustainable.Earthisthefifthlargesplanetinthesolarsystem.ItsdiameterisjustafewhundredkilometerslargerthanVenus.Earthrotatesonitsaxisonecompleterevolutioninatwenty-fourhourperiodandorbitstheSuninthreehundredandsixtyfivedays.

　　MarsisthefourthplanetfromtheSunandistheclosestneighbortoearth.EveryseventeenyearsMarsreachesitsclosestpointtoearthinitsorbitaroundtheSunatthirty-fivemillionmiles.

　　Marsisasmallplanetthathasaredglow.ItmakesonecompleteorbitaroundtheSuninsixhundredandeightysevendays.OxygenandwatervaporhavebeendetectedintheatmosphereofMars,andayellowishfogandcloudsmovearoundtheplanetindicatingthattheplanethasdifferenttypesofweatherandseasonsliketheearth.AsingledayonMarsisverymuchlikeadayonearthlastingtwenty-fourhoursandthirty-sevenminutes,however,ayearonMarsistwiceaslongasoneyearonearth.

　　JupiterthefifthplanetfromtheSungetsitsnamefromtheFatheroftheGreekGods.Jupiter,whichorbitsfourhundredeighty-threemillionmilesfromtheSun,isthebiggestofalltheplanetsinoursolarsystem.Ithasadiameterofeighty-ninethousandmilesandavolumeofthirteentimesthatofearth.JupiterorbitstheSuneverytwelveyears.Itsatmosphereisthousandsofmilesthickandismadeupofmainlyhydrogen.Thesurfacetemperatureisabout-205°F.TherearenoseasonsonJupiter,butithasfloatingcloudsofammoniaandmethanegas.

　　JupiterhasabrightreddistinctivespotthatismorethantwiceaswideasEarth.ThismarkhasastronomerspuzzledbecausethereisnoreasonforthebrightspotduetothefactthatitdoesnotreceivemuchSunlight.ThisspotenablesustoseethatJupiterhasaveryfastrotation.Onerotationiscompletedeverytenhours.Theforcesplacedontheplanetduetothisquickrotationcausethecloudsattheequatortobulgelikeatire,butduetothegravitationalforcesoftheplanetkeepthecloudsfrombeingcastintospace.

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