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Symposium 04（第2页）

Frequentexchangeofmaterialwithotherplanetarysystems，

Dustkickedupbycometimpactscanbepushedbythepressureofsunlight，

Flyingoutwardataspeedof108，000kilometersperhour，

fasterthantherelativevelocitiesoftwostarsatcloseencounters，

Thismeansthatmicrobesmaybeabletotakeadvantageofthisprocess，

Jumpingfromthesolarsystemtoanotherplanetarysystempassingby，

TheexistenceoflifeonearthandtheevolutionofadvancedlifeisalsorelatedtothefactthattheearthhasaJupiter，

ItispreciselybecauseofJupiterthathasthelargestmassandvolumethatitattractsmanymeteoriteimpactstotheearth，

IfthereisnoJupiter，thechancesofEarthsufferingfromthesamemeteoritethatkilledthedinosaurs，

Itwillbeonceevery10，000years，thennoadvancedlifecanevolveontheearthatall，

TheemergenceofhumanbeingsisbelievedtobetheresultofaseriesoffortuitouseventsonEarth，

Weknowthattherehavebeenseveralmassextinctionsoflifeinthe4.6billion-yearhistoryoftheearth，

ThereasonfortheextinctionofthedinosaursisrelatedtotheChikrubemeteoritethathittheYucatanPeninsulainMexico.

Afterthatmeteoriteimpact，theatmospherewasheatedtotemperaturesthatwouldbedifficultforlargeorganismstosurvive，

Andformalong-term，globalsevereclimate，

Thisledtotheeventualextinctionofmanyorganisms，includingdinosaurs，duetotheruptureofthefoodchain.

Butthemilkanimalswereablessingindisguise，andtheearthhassincehadanewdirectionofbiologicalevolution.

ThisisthebeginningoftheAnthropocene，

EveniftheAnthropocenecouldgoonforever，

Buttheultimatefateofhumansandtheplanetdependslargelyonthesun.

About5billionyearslater，

Mostofthehydrogeninthesunwillaggregateintohelium，atthistimeaso-calledheliumflashwilloccurandbecomearedgiantstar，

Itsvolumewillincreaseto100timesitsoriginalsizeandengulfMercury，VenusandEarth，

Thisistheendoftheearth...

atthistime，

Ninalookedatthetransparentwoodenrimlesssmartglasses，

Saidslowly:CouldtherebelivingthingsonMars?

Dorislookedatthetransparentwoodenrimlesssmartglasses，andsaidslowly:

Martianlifeshouldbesomekindofradiation-tolerantmicroorganism，

ThesurfaceofMarsisextremelyharshanddangerousforlife，

SincetheenvironmentofMarsissoharsh，itisimpossibleforthehumanoidMartianstoexistinourimagination，andevenotherordinarycreaturesweknowcannotsurviveonit，

OnEarth，therearealsosomeplaceswheretheenvironmentisquiteharsh，butthereisstilllife，

Forexample，ahalophilicarchaealivesinthecoldandhighlysalineenvironmentofAntarctica.

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