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SPACE-THE UNIVERSE

THE   UNIVERSE   CONTAIN EVERYTHING  that   exists, from  the tiniest   subatomic  particles   to  glacial  super .clusters(the largest  structures  known). Nobody   knows   how  big  the  universe  is ,  but  astronomers    estimate  that  it  contains    about   100 billion  galaxies , each  comprising   an  average of   100  billion  stars.The  widely  accepted   theory  about  the  origin  of  the  Universe   is  the  big  bang theory. Which  states   that  the  Universe   came  into  being  in a  huge  explosion-the  big  bang -  that  took  place   between   10 and  20  billion  years  ago.The  Universe  initially   consisted  of   a  very  hot ,dense   fireball of  expanding  ,cooling  gas.After  about   one  million  years,the  gas probably began  to  condense  into  localized   clumps  called  protogalaxies.During   the  next  five   billion  years ,  the  protogalaxies   continued  condensing , forming  galaxies  in  which  the  stars   were  being born .Today  ,  billions  of  years  later ,  the Universe   as  a  whole   is   still   expanding , although   there  are  localized   areas  in  which   objects  are  held  together  by  gravity;for  example ,  many  galaxies   are  found  in  cluster .The  big  bang   theory   is  supported  by    the  discovery  of faint ,  cool back round    radiation  coming     evenly  from  all  directions .The   radiation  is believed     to  be  the  remnant     of   the  radiation    produced   the  big  bang .Small     "ripples" in  the   temperature  of  the  cosmic   background   radiation  are  thought   to  be  evidence  of   slight  fluctuations   in  the   density  of  the   early  Universe, which  resulted  in  the  formation   of  the  galaxies .Astronomers do  not  yet    know    if  the  Universe   is  "closed",  which means    it  will  eventually  stop   expanding   and  begin  to   contract ,or  if  it  is  "open",  which  means   it  will   continue   expanding   forever.

UNIVERSE


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