Answers edited by Sanjay Kamath

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• How do black holes relate to the formation of galaxies?
  
• When do chemical reactions happen?
  
• How can scientists estimate the size of the universe if it is expanding?
  
• How has Electromagnetic Spectrum impacted society?
  
• Question #d577e
  
• How do states of matter change?
  
• How do scientists study the Sun?