Answers created by Boldizsár B.

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• What is the effect of the expansion of the universe on light?
  
• How is the size of the universe calculated?
  
• How does dark energy affect the expansion of the universe?
  
• How does Hubble Law relate distance to velocity?
  
• How many planets are in the universe? How is this number estimated?
  
• With an isolated hydrogen atom as an example, what would happen if the strong force suddenly ceased?