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PAGE\*MERGEFORMAT4Astronautsonshortershuttlemissions(使命)oftenworkverylongdays.Tasksarescheduledsotightlythatbreaktimesareoftenusedtofinishtheday'swork.ThistypeofscheduleisfartoodemandingforlongmissionsontheInternationalSpaceStation(ISS)．ISScrewmembersusuallyliveinspaceforatleastaquarterofayear.TheyworkfivedaysonandtwodaysofftomimicthenormalwaytheydothingsonEarthasmuchaspossible.Weekendsgivethecrewvaluabletimetorestanddoafewhoursofhousework.Theycancommunicatewithfamilyandfriendsbyemail，Internetphoneandthroughprivatevideoconferences.Whileastronautscannotgotoabaseballgameoramovieinorbit，therearemanyfamiliaractivitiesthattheycanstillenjoy.Beforeamission，thefamilyandfriendsofeachISScrewmemberputtogetheracollectionoffamilyphotos,messages，videosandreadingmaterialfortheastronautstolookatwhentheywillbefloating370kilometersabovetheEarth.Duringtheirmission，thecrewalsoreceivescarepackageswithCDs，books，magazines，photosandletters.Andasfromearly2010，theInternetbecameavailableontheISS，givingastronautsthechancetodosome“Websurfing(冲浪)”intheirpersonaltime.Besidesrelaxingwiththesemorecommonentertainments，astronautscansimplyenjoytheexperienceoflivinginspace.ManyastronautssaythatoneofthemostrelaxingthingstodoinspaceistolookoutofthewindowandstareattheuniverseandtheEarth.BoththeshuttleandtheISScircletheplanetseveraltimeseachday，andeverymomentoffersanewviewoftheEarth'svastlandmassandoceans.Theworld'slargestaircraftmadeitspublicdebutlastweekatEurope'sbiggestfactory，apurposebuiltassemblylineinToulouse，southernFrance.TheAirbusA380willhave50percentmorefloorspacethanAmericanrivalBoeing's747Jumbo，withroomforduty freeshops，restaurantsandevenasauna.Thisnewarrivalisexpectedtochangethefaceofairtravel.TheA380willenterserviceearlynextyearwithSingaporeAirlines.AirbusclaimstheA380willburnlessfuel，makelessnoise，createlesspollutionandcost17percentlessperseatthanthe747.Itwillalsoreducetrafficproblemsintheskies.Theaircraft，whichcostbetween￡140million(US$250m)and￡157million(US$280m)eachcomparedwith￡84
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