Answers created by Rian Leevinson

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• How big is the universe in km?
  
• Question #f73f3
  
• What does the cosmological principle state about the universe?
  
• What components are necessary to classify a grouping of stars and planets as a galaxy?
  
• Where is the solar system could life exist other than on Earth?
  
• Question #66ce4
  
• Question #98538
  
• Does the Sun generate most of its energy using the CNO fusion cycle?
  
• What is the biggest planet in the Milky Way?
  
• What us the color of the star Bellatrix, which has a surface temperature of of approximately 21,000 K?
  
• How can astronomers tell the universe is expanding?
  
• Question #c2e92
  
• Does the moon orbit in a clockwise or counterclockwise direction around the earth?
  
• How far away is the first pulsar from the earth?
  
• How far away, in kilometers, is Proxima Centauri from the sun?
  
• How often does perihelion occur in an orbit?
  
• How many times farther away is the sun from Earth than the moon?
  
• What direction does Mars rotate?
  
• How does the earth spin in space?
  
• Which way does the Earth spin?