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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2020-03-19 21:38
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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.

2020-03-19 21:41:41

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