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Symposium 04（第1页）

Symposium04

Symposium04

halfanhour，

Sitinthefirsthalf-personhighwoodenhighchairtotheleftofthepodium，

Doriswearingasmartnanomembranefacemask，

Getupandwalkslowlytothefrontofthepodium，

atthistime，

Ninalookedatthetransparentwoodenrimlesssmartglasses，

Sayslowly:Isthereavarietyofalienlifeinthesolarsystem?

Dorislookedatthetransparentwoodenrimlesssmartglasses，andsaidslowly:

After3.8billionyearsofevolution，

Nowtherearemanyformsoflifeonearth，manyspecies，

However，eventhesimplestlifeonearthstillhasrequirementsfortheenvironment，

Forexample，theyneedwater，organicmaterialsandenergy，

Withoutanyonefactor，theymaynotsurvive，

Withcontinuousexploration，wehavelearnedmoreabouttheearthandotherplanets，

halfanhour，

Ninalookedatthetransparentwoodenrimlesssmartglasses，

Slowlysay:Whyislifeamiracleoftheuniverse?

Dorislookedatthetransparentwoodenrimlesssmartglasses，andsaidslowly:

Becauseoftheprocessoflifegenerationandevolution，therearemanyspecialconditions，

Ifanyoftheseconditionsaremissing，

Thenlifewouldnotbeabletoariseorevolvetothelevelitistoday，

Thesunissuitablefortheexistenceoflife，

Ifitsmassistoolarge，itwillburntoofasttowaitforlifetoappear，

Earth'sorbitisappropriate，itmakesthetemperatureonEarthjustrightforlifetoexist，

IfEarthwereintheorbitofVenusorMars，itwouldbetoohotortoocoldforlifetoexist，

ThesunhasacompanionstarcalledNemesis，

Every26millionyearsorso，itcollideswiththeOortcloudregionattheedgeofthesolarsystem，

ThisnumberisveryclosetothecycleofmassextinctionsonEarth，

MassextinctionsonEarthseemtohappenevery20to40millionyears，

CometsfromaliengalaxiesarethemaincauseofextinctiononEarth，

Thesolarsystemwillbebombardedbysuchcomets，

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