p16.5 the beginning and future of the universe

• what is the theory of the Big Bang?

  • the universe is expanding after exploding suddenly from a very small and extremely hot and dense region
  • space, time, and matter were created in the Big Bang
• what is cosmic microwave bacground radiation?

  • created as hig-energy gamma radiation just after the Big Bang
• what is dark matter?

  Unknown mass-energy that does not emit, absorb, or reflect light.