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OpenStudy (anonymous):

what stage follows a protostar

OpenStudy (theeric):

I don't know for sure, but I'll point you to some sources I found with a quick web search. http://www.eso.org/public/outreach/eduoff/cas/cas2002/cas-projects/uk_aldebaran_1/image002.jpg http://library.thinkquest.org/05aug/00108/mainsequence_frameset.htm

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