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1、.MBA英语阅读理解（精读精解）Themarveloustelephoneandtelevisionnetworkthathasnowenmeshedthewholeworld,makingallmenneighbours,cannotbeextendedintospace.Itwillneverbepossibletoconversewithanyoneonanotherplanet.Evenwithtoday'sradioequipment,themessageswilltakeminutes-sometimeshours-ontheirjourn
2、ey,becauseradioandlightwavestravelatthesamelimitedspeedof186,000milesasecond.TwentyyearsfromnowyouwillbeabletolistentoafriendonMars,butthewordsyouhearwillhavelefthismouthatleastthreeminutesearlier,andyourreplywilltakeacorrespondingtimetoreachhim.Insuchcircumstances,anexchangeofv
3、erbalmessagesispossible-butnotaconversation.Toaculturewhichhascometotakeinstantaneouscommunicationforgranted,aspartoftheverystructureofcivilizedlife,this"timebarrier"mayhaveaprofoundpsychologicalimpact.Itwillbeaperpetualreminderofuniversallawsandlimitationsagainstwhichnotallourt
4、echnologycaneverprevail.Foritseemsascertainasanythingcanbethatnosignal-stilllessanymaterialobject-canevertravelfasterthanlight.Thevelocityoflightistheultimatespeedlimit,beingpartoftheverystructureofspaceandtime.Withinthenarrowconfinesofthesolarsystem,itwillnothandicapustoosevere
5、ly.Attheworst,thesewillamounttotwentyhours-thetimeittakesaradiosignaltospantheorbitofPluto,theouter-mostplanet.Itiswhenwemoveoutbeyondtheconfinesofthesolarsystemthatwecomefacetofacewithanaltogetherneworderofcosmicreality.Eventoday,manyotherwiseeducatedmen-likethosesavageswhocanc
6、ounttothreebutlumptogetherall..numbersbeyondfour-cannotgrasptheprofounddistinctionbetweensolarandstellarspace.Thefirstisthespaceenclosingourneighbouringworlds,theplanets;thesecondisthatwhichembracesthosedistantsuns,thestars,anditisliterallymillionsoftimesgreater.Thereisnosuchabr
7、uptchangeofscaleintheterrestrialaffairs.Manyconservativescientists,appalledbythesecosmicgulfs,havedeniedthattheycaneverbecrossed.Somepeopleneverlearn;thosewhosixtyyearsagoscoffedatthepossibilityofflight,andtenyearsagolaughedattheideaoftraveltotheplanets,arenowquitesurethatthesta
8、rswillalwaysbebeyondourreach.Andagaintheyarewro
