求外研版初二上Module3Unit2的课文我要用那篇课文，-查字典问答网

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　　求外研版初二上Module3Unit2的课文我要用那篇课文，就是讲宇宙的那篇：Scientiststhinkthattherehasbeenlife...快！

　　求外研版初二上Module3Unit2的课文

　　我要用那篇课文，就是讲宇宙的那篇：Scientiststhinkthattherehasbeenlife...

　　快！

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2020-03-1921:38

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李俊盛

　　ScientiststhinkthattherehasbeenlifeonEarthformillionsofyears.However,wehaven'tfoundlifeonotherplantsyet.Whynot？

　　TheEarthisaplantanditgoesaroundtheSun.Noneofthemhasanenviormentwithair,sopeopleandthingscannotgrow.TheSunanditsplantsarecalledthesolarsystem.Thesolarsystemisasmallpartofourgalaxy.

　　Thestarsweseeatnightarethesunsinothersolarsystems.Therearemorethan200billionstarsinourgalaxy,calledtheMikyway,andourSunisonlyoneofthem.

　　Butscientistshavediscoveredmanyothergalaxiesintheuniverse.Theyarealongwayawayandtherelighthastravelledformanyyearstoreachus.Itishardtounderstandhowlargetheuniverseis.

　　Scientistshavelotsofspacecrafttolookatotherplantsinoursolarsystem,andsomespacecrafthavegonebeyondthesolarsystem.However,noonehasdiscoveredanylifeinspaceyet.

　　Butwhyhasnoonefromotherplantssentusamessage?Havetheytriedtosendimformationtous?Withsomanystarsintheuniverse,arewealone,oristherelifeoutthereinspace?Wedon'tkonw...yet.