Star cloud

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As a star cloud in astronomy dense accumulations are of stars in the light band of the Milky Way called the freiäugig only as Nebula appear and usually physically belong together. You can

  1. consist of bright stars from a nearby spiral arm of our Milky Way or
  2. from a larger group of stars, which are given an apparently compact form by absorbing dark clouds or
  3. be a close or particularly large open star cluster .

Examples

The most famous examples of these three types of star clouds can be seen in the summer sky :

  • the shield cloud in the constellation shield - between eagle and sagittarius
  • the central part of the constellation Swan , before the Milky Way apparently divides
  • the small Sagittarius cloud in Sagittarius, the main part of which corresponds to the star cluster Messier 24

literature

  • Joachim Herrmann, DTV Atlas Astronomy . DTV-Verlag, 15th edition
  • Albrecht Unsöld , The New Cosmos . Springer-Verlag, Berlin 2005
  • W. Tirion, R. Sinnott: Sky Atlas 2000.0 , 2nd edition, sheets 15-22, Cambridge University Press