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.
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.
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
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
BACK The end of the Big Bang?