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SPACE-GALAXIES

A  GALAXY  IS    A  HUGE   MASS    OF  STARS , nebulae,   and  interstellar    material .The  smallest    Galaxies    contain  about   100,000  stars ,  while  the  largest  contain  up  to   3,000   billion  stars .
There  are  three   main  types   of  Galaxy , classified  according    to  their  shape ;elliptical  ,which    are  oval  shaped; spiral, which  have   arms  spiraling  outwards   from  a  central  bulge; and  irregular, which   have  no  obvious  shape .Some times ,  the   shape  of  a  galaxy   is  distorted  by  by  a  collision   with  another  galaxy .Quasars (quasi -stellar   objects )  are  thought   to  be  galactic nuclei     but  are  so  far  away    that  their   exact   nature   is  still  uncertain.They  are  compact ,highly  luminous  objects   in  the   outer  reaches   of  the  known  Universe . while   the furthest   known " ordinary"  Galaxies     are  about     10  billion   light  years   away ,  the  furthest   known quasar   is  about  15  billion   light years   away .
Active  galaxies  ,  such  as  Seyfert   galaxies   and  radio  galaxies ,  emit  intense  radiation.In  a  Seyfert  galaxy  ,  this  radiation  come from   the      galactic  nucleus ; in  a  radio  galaxy ,  it  also    comes  from   huge lobes   on   either   side  of   the  galaxy. The  radiation  from  active  galaxies  and     quasars   is  thought  to   be   caused   by  black  holes. 




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