简介：Likepeople,starsareborn.Theywillalsogrowoldanddie.Theirbirthplacesarehuge,coldcloudsofgasanddust,knownas“1)nebulas.”ThemostfamousoftheseistheOrionNebula.Itisjust2)visiblewiththeunaidedeye.Thesecloudsstartto3)shrinkundertheirown4)gravity.Asthecloudgetssmaller,itbreaksinto5)clumps.Eachclumpeventuallybecomessohotand6)densethatnuclearreactionsbegin.Whenthetemperaturereaches10milliondegreesCelsius,theclumpbecomesanewstar.
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