scale.Youmusttravelfasterthanlightwavesbeforeyoucanendyourdepartureintheuniverse-andthisisnot!InthefirstkindofFriedmannmodel,theexpansionoftheuniverseandcollapse,spaceasthesurfaceoftheearththatbendandfoldbacktoher.Inthesecondcategoryofeverexpandingmodel,spaceisbentinanotherway,likeasaddlesurface..Sointhis
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