Answers edited by Rishab C.

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• How have the ideas about the structure of the solar system changed since hundreds of years ago?
  
• How does the life cycle of a massive star differ from the life of an average star?
  
• What is a major concern with drinking water in India and Bangladesh?
  
• Are acids or bases more dangerous? Why?
  
• How did Kepler and Copernicus believe the universe worked?
  
• How do you convert 1/5 into a decimal and percent?