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1、NASASatelliteFallingFasterDuetoSolarActivityUARStocrashlFridaybutnooneyetknowswhere.ThesamplecapsulefromJapansHayabusaspacecraftbecameafireballasitfelltoEarthlastJune.September212011ItmaybedoomedbuttheNASAsatellitethatsa

2、bouttocrashlonEarthisntgoingoutquietly.ToscientistssurprisethesixtonUpperAtmosphereResearchSatelliteUARShaspickedupspeedisnowexpectedtoplummetthroughtheatmosphereFriday.Onlytwoweeksagogovernmentscientistsprojectedthatthe

3、satellitecouldreturntoEarthaslateasthefirstdaysofOctober.“Thespacecraftiscominginalittlefasterthanwediginallyanticipated“saidNASAbitaldebrisscientistMarkMatney.Asaresult“itscominginsoonerratherthanonthelaterside.“Thesate

4、llitesspeedisduetoarecentspikeintheamountofultravioletraysbeingemittedbythesunMatneysaid.TheradiationincreasecausedEarthsatmospheretoexpwhichincreaseddragonthesatellitecausingittofallfaster.AThousPoundstoSurviveReentryEx

5、pertspredictthatmostoftheUARSspacecraftwillburnupinEarthsatmosphere.Butmethan1100pounds(500kilograms)ofdebriswillprobablysurvivethefieryplungeslamdowntoEarth.Thebiggestpiecetoreachthesurfaceintactwillmostlikelybea300poun

6、d(150kilogram)pieceofthespacecraftsframe.HoweveritsstilltooearlytoknowwherethesatellitescomponentswilllMatneysaid.Theonlytipscientistscangivefnowaboutthelocationofthe“debrisfootprint“isthatitwillbesomewherebetween57degre

7、esnthlatitude57degreessouthlatitude—anareaencompassingmostofEarthspopulatedl.OddsofDebrisHittingYou:1in3200UARSwhichcollecteddataonEarthsatmospherefrom1991to2005wasdesignedwellbefescientistsstartedtowryaboutspacedebris.D

8、uringthesatellitesdevelopmentitscreatsfocusedonhowtodeployitsafelynothowitwouldenditsdayssaidtheUniversityofMichigansWilbertSkinneroneoftheleadscientistsfUARS.“Idontthinkwetookanytimeatallwonderingwhatitsultimatefatewoul

9、dbe“Skinnersaidaddingthatatthetimesuchconcernswere“backgroundnoise.“Thoughthesatellitesdeathplungewillbedramatic—willcreateavisiblelightshowfnearbyobservers—itisunlikelytoendangeranyoneontheground.TheoddsthatdebrisfromUA

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