Home > Gruppi Stellari: Ammasso Globulare, Ammasso Aperto, Associazione OB, Associazione Orion Ob1, Ngc 6231, Stella Binaria(Italian)
Gruppi Stellari: Ammasso Globulare, Ammasso Aperto, Associazione OB, Associazione Orion Ob1, Ngc 6231, Stella Binaria(Italian)

Gruppi Stellari: Ammasso Globulare, Ammasso Aperto, Associazione OB, Associazione Orion Ob1, Ngc 6231, Stella Binaria(Italian)

          
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About the Book

Fonte: Wikipedia. Pagine: 23. Capitoli: Ammasso globulare, Ammasso aperto, Associazione OB, Associazione Orion OB1, NGC 6231, Stella binaria, Nube stellare del Sagittario, Cintura di Gould, Superammasso stellare, Westerlund 1, Westerlund 2, Ammasso Arches, Ammasso Quintupletto, Associazione stellare, Stella binaria a raggi X, Stella tripla, Bolle blu. Estratto: Un ammasso globulare (detto anche ammasso chiuso o ammasso di alone) e un insieme sferoidale di stelle che orbita come un satellite intorno al centro di una galassia. Gli ammassi globulari sono sorretti al loro interno da una forte gravita, che da loro il tipico aspetto sferico e mantiene al loro centro una densita di stelle relativamente molto elevata. Il nome di questa categoria di oggetti deriva dal latino globus, che significa "globo," "sfera." Talvolta ci si riferisce a questi oggetti semplicemente con l'appellativo globulare. Gli ammassi globulari sono in genere composti da centinaia di migliaia di stelle vecchie, le stesse che compongono il nucleo, noto come bulge, di una galassia spirale, ma confinate in pochi parsec cubici. Gli ammassi globulari sono piuttosto numerosi: se ne conoscono 158 attorno alla Via Lattea, con forse altri 10-20 da scoprire, essendo nascosti all'osservazione da Terra dalle polveri interstellari che oscurano la vista in direzione del centro galattico; pare che le galassie piu grandi possano averne un numero nettamente superiore (la Galassia di Andromeda potrebbe averne fino a 500). Alcune galassie ellittiche giganti (come M87) ne contano fino a 10.000. Questi oggetti sono considerati parte dell'alone delle galassie, orbitando attorno ai centri di queste a distanze fino a 131.000 anni luce. Ogni galassia del Gruppo Locale con massa sufficientemente grande ha associato un suo gruppo di ammassi globulari, mentre ogni grande galassia possiede un sistema esteso di questi oggetti. La Galassia Nana Ellittica del Sagittario e quella del Cane Maggiore sono in via di collisione ed as...


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Product Details
  • ISBN-13: 9781232009238
  • Publisher: Books LLC, Wiki Series
  • Publisher Imprint: Books LLC, Wiki Series
  • Height: 246 mm
  • No of Pages: 24
  • Series Title: Italian
  • Sub Title: Ammasso Globulare, Ammasso Aperto, Associazione OB, Associazione Orion Ob1, Ngc 6231, Stella Binaria
  • Width: 189 mm
  • ISBN-10: 1232009237
  • Publisher Date: 30 Jul 2011
  • Binding: Paperback
  • Language: Italian
  • Returnable: N
  • Spine Width: 1 mm
  • Weight: 64 gr


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