The Big Bang Theory is the dominant scientific theory about the origin of the universe. According to the big bang, the universe was created sometime between 10 billion and 20 billion years ago from a cosmic explosion that hurled matter and in all directions. In 1927, the Belgian priest Georges Lemaître was the first to propose that the universe began with the explosion of a primeval atom.

• Read the definition of the Big Bang.
  
• Discover more about what the Big Bang theory is.
  
• Read a biography of the "Father of the Big Bang Theory," Georges-Henri Lemaitre.
  
• Forum Post of the Day:
  
  Subject: eschatology, is this fact or fiction?
  "I would appreciate some feed back on this web sight on whether this phenomenon is possible or not. http://groups.msn.com/eschatology."
  TERRYBURK1
• Before you buy a telescope, spend some time watching the night sky with binoculars. Check out these Top Binoculars Under $150.00.

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• * Spotlight: The launch of the first artificial satellite, Sputnik 1 caused a big political backlash in the US.