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The Universe's Good Neighbors: Compact Groups Ricardo Bilton and  Kalei Sabaratnam
Compact..what? ,[object Object],Paul Hickson, "Compact Groups of Galaxies."
Properties of Compact Galaxies  ,[object Object],[object Object],A Hickson compact group is 3-6 galaxies that have little distance between them Compact groups contain            significantly smaller amounts     of spiral and irregular galaxies  
Compact Groups - Cosmic Building Blocks?  ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
When two (or more) become one ,[object Object],Galaxy collisions usually result in the disruption of the overall shape of the galaxy. "The parents disappear into their offspring."  Because stars are very far apart, gas clouds are more likely to interact when two galaxies collide. Star bursts sometimes result from galaxy collision.
Case Study: Stephan's Quintet ,[object Object]
Resulting tail from galaxy collision
  ,[object Object]
  ,[object Object],(Not a member)
 

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