View Single Post
Naty1
Naty1 is offline
#8
Sep8-11, 07:45 AM
P: 5,634
Shazdeh: Welcome to Physicsforums.....

try reading the FAQ several more times..slowly..maybe over a few days...understanding the terminology and the concepts is not easy...especially when you are getting started....for example "tidal forces" is NOT an obvious concept..Wikipedia for one explains it....

from the FAQ:
"...In a homogeneous cosmology, symmetry guarantees that tidal forces vanish everywhere, and that any observer at rest relative to the average motion of matter will measure zero gravitational field..."

So despite what might be commonly thought, there was relatively little gravity....a rough analogy might be falling through to the center of the earth...the further you fall from the surface the more gravity pulls you out as well as in....at the exact center you are pulled equally in all directions....

Another analogy: in outer space, you virtually "float" because you are pulled weakly but about equally in all directions by gravity....


So the big bang is the cosmological model that describes how the early universe expanded from a hot, dense phase into a cooler, less dense phase.
yes....there was enough energy to cause incredibly rapid expansion....but no one knows just what caused the big bang itself...what was the nature of the initial instability....