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Astronomi

TermDefinition
Spiralgalakse En spiralgalakse er en galakse med spiralarme. Man betegner en spiralgalakse bogstavet S. Der findes her tre undertyper, S0m(flad skivee med gas og støv og ingen spiralarme), S (både skive og spiralarme) og SB (spiralarmene udgår fra en bjælke)
Elliptiske galakse Disse galakser er ellipseformet og betegnes bogstavet E efterfulgt af et tal, der angiver, hvor "flad" den er. E-galakser består mest af population II stjerner, og dermed indeholder de næsten ingen gas eller støv.
Mælkevejen Bjælkespiralgalakse, som ligger i hoben Lokalgruppen..
Hob Langt de fleste galakser er samlet i hobe eller mindre enheder, som betegnes grupper.
Tre slags galakser Spiralgalakser, irregulære galakser og elliptiske galakser.
Superhob Galaksehobe samlet i større grupper
Mælkevejens geografi Skiven, de centrale dele og haloen
Mælkevejens to bestanddele Stjerner og gas & støv
Haloen Mælkevejens flade skive er indhyllet i en såkaldt halo, og haloen er et næsten kugleformet område, hvor der ikke længere dannes stjerner.
Skiven Solen befinder sig i Mælkevejens skive omkring 27000 lysår fra centret. Skiven er ret tynd med en tykkelse på 1000-2000 lysår, og det meste af Mælkevejens gas og støv befinder sig her.
Created by: 1444514822380467
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