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Steady State Theory

In this model the Universe:

  • Is expanding
  • Has unchanged density
  • Spontaneously created matter, espically hydrogen, from empty space to maintain density
  • Had no beginning and will never end
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Big Bang Theory

In this model the Universe:

  • Is expanding
  • Is finite and ever-changing
  • Was created about 14 billion years ago from an event called the Big Bang
  • May have an end, depending on its density

Most scientists believe that the Big Bang Theory is correct, because it explains red shift and cosmic microwave background radiation

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