Big Bang Explained... the Big Bang is the Cosmological Theory  
     of the
Origin of the Universe...   the Big Bang is a unifying theme of
     astrophysics, as is
Darwinian Evolution a unifying theme of biology.

  
     EXPANSION is the basis of Big Bang model - sort of an explosion of
     space itself that happened everywhere, much like the surface of a
     balloon expanding - happens everywhere at once.

Misconceptions:
  1.  was not a "
bomb" that went off at center of universe hurling matter outward.
            It did not explode from a particular location into a preexisting void.
  2.  Big Bang model
does not describe the Big Bang itself, only what happened afterward.
  3.  Does not expand into space, but sort of around it -
it has no center or edge.
  4.  Universe
was not size of a grapefruit. What is often meant is that the Universe we can observe
            (not space itself, but the solids in it - galaxies) was more tightly packed. It was packed
            smaller...  but, small is a relative term. The totality of space is
infinite; shrink an infinite
            space a little and it is
still infinite.
  5. as space
expands, not everything in it does also. Gravity overpowers expansion and results
            in an equilibrium of size; thus
galaxies remain same size and do not expand.
 

Analogy:

  a.  You live on the
surface of an inflating 2D balloon; with inflation the distance between points is
           increasing, thus the surface of the balloon is expanding; distance to remote galaxies is
           increasing, but the galaxies themselves are not moving away - the space between galaxies
           is expanding.
  b. 
In reverse: any given region of the Universe shrinks and all of the galaxies within it get closer,
           until they smash together = Big Bang 
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The end of the Big Bang?