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SPACE-NABULAE AND STAR CLUSTERS.

A  NEBULAE   IS  A  CLOUD  OF  DUST   AND  GAS  inside  a  galaxy .Nebulae  become  visible   if  the  gas  glows   , or  if  the  cloud  reflects  starlight    obscure  light   from  more  distant  objects .Emission    Nebulae  shine  because    their  gas  emits   light   when it is  stimulated  by  radiations  from  hot  young   stars .Reflection  Nebulae  shine   their  dust  reflects  light   from  stars  in   or around  the  nebulae.Dark  nebulae   appear    as   silhouettes   they  block  out light  from   shining  nebulae  or  stars  behind   them. Two  types  of  nebulae  are  associated    with  dying stars ;planetary  nebulae and  supernova   remnants . Both  consist of  expanding   shells  of  gas    that  was  once  the  outer    layers  of the  stars.A  planetary  nebulae  is   gas  shell   drifting  away  from  a  dying  stellar  core.. A  supernova  remnant    is  a   gas  shell moving  away   from  a  stellar  core  at  great  speed   following  a  violent   explosion   called  a  supernova. Stars  are  often   found  in  groups  known  as  clusters.Open  clusters  are  loose   groups  of  a  few  thousands  of  young  stars   that  were  born  in   the  same  cloud  and  are  drifting  apart . Globular  cluster     are  densely   packed ,  roughly  spherical   groups  of   hundreds   of  thousands   of older   stars.
 

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