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Galaxien damals und heute: Wie hat sich das Wissen um Galaxien innerhalb der letzten 25 Jahren geändert?

Galaxien damals und heute: Wie hat sich das Wissen um Galaxien innerhalb der letzten 25 Jahren geändert?

          
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About the Book

Studienarbeit aus dem Jahr 2014 im Fachbereich Physik - Astronomie, Note: 1,0, Sprache: Deutsch, Abstract: Wie sind Galaxien entstanden? Wie sind Galaxien aufgebaut? Was für Arten von Galaxien gibt es? Was passiert, wenn zwei Galaxien kollidieren? Wie Entwickeln sich Galaxien weiter? Was wird aus der Milchstraße? Diese Seminararbeit beschäftigt sich mit diesen Fragen und vergleicht, wie sie heute und vor 25 Jahren beantwortet wurden. In Spiralgalaxien kann man im Gegensatz zu elliptischen Galaxien sehr gut einzelne Strukturen erkennen, wie das Halo, welches kugelförmig die Galaxie umgibt und eine flache Scheibe, mit den Spiralarmen mit einem dichten Zentrum aus Sternen. Im Halo, welcher einen Radius von bis zu 200 000 LJ haben kann, bewegen sich vereinzelt Kugelsternhaufen, wodurch er relativ dunkel ist im Gegensatz zur Spirale. Einige Kugelsternhaufen bewegen sich aber auch außerhalb des Halos. Diese Sternhaufen können mehrere Millionen von Sternen, meist alte Rote Riesen welche schon erkaltet sind, enthalten und weisen Radien von bis zu 150 LJ auf. Ihre Bahnen verlaufen außerdem sehr exzentrisch um den Kern, bis zu 300 000 LJ über die Scheibenebene hinaus. Beim Durchkreuzen dieser Scheibe wird Gas an diese abgegeben, woraufhin die Roten Riesen zu weißen Zwergen werden. Die Arme der Scheibe, deren Radius oft das 50-fache ihrer Dicke beträgt, liegen eher lückenhaft und ohne klar definierbare Grenzen vor. Das Größenverhältnis zum Galaktischen Zentrum, oder auch Bulge genannt, ist von Galaxie zu Galaxie verschieden. Im Gegensatz zu den Sternen in der Scheibe sind diejenigen im Zentrum viel älter und bewegen sich auf Bahnen, welche weit aus der Scheibenebene herausführen, oder sogar im spitzen Winkel dazu verlaufen. In der Scheibe können jedoch auch noch Sterne durch das vorhandene Material, wie Staub und Gas, neu entstehen. Es konnte damals schon durch die Rotation der Galaxien die Existenz von dunkler Materie postuliert werden, welche wahrscheinlich um den Halo h


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Product Details
  • ISBN-13: 9783668479470
  • Publisher: Grin Verlag
  • Publisher Imprint: Grin Verlag
  • Height: 210 mm
  • No of Pages: 28
  • Spine Width: 2 mm
  • Weight: 50 gr
  • ISBN-10: 366847947X
  • Publisher Date: 24 Jul 2017
  • Binding: Paperback
  • Language: German
  • Returnable: N
  • Sub Title: Wie hat sich das Wissen um Galaxien innerhalb der letzten 25 Jahren geändert?
  • Width: 148 mm


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