^The myth: The Big Bang theory explains how the universe was
  created or began to exist. The reality: The Big Bang theory
  extrapolates from our observations about the present universe
  that the early universe underwent a massive, rapid expansion
  that has continued to this day. Some people have interpreted the
  data to postulate that time, space, matter and energy had a
  beginning in the finite past, but the central value of the Big
  Bang theory is the explanation of the early expansion of the
  universe -- not how the universe came into being. -NASA^