Applied Sciences homework help

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Chapter 21 Questions
 

  • Briefly explain why we expect collisions between galaxies to be relatively common, while collisions between stars are extremely rare.

 
 
 
 
 

  • Why should galaxy collisions have been more common in the past than they are today?

 
 
 
 
 

  • What evidence convinced astronomers that the large redshift of quasars really do imply great distances?

 
 
 
 
 

  • What are supermassive black holes?

 
 
 
 
 

  • What evidence supports the idea that a supermassive black hole is in the center of our galaxy?