|
Hi,
Space time only has to expand a little bit say a fraction of a fraction of a fraction of a percent per centimeter say per year. However there are a hell of a lot of centimeters between here and the edge of the visible universe. This adds up to a hell of a lot of new space per year.
So locally you cant see it expanding on any human scale and in any case the strong nuclear force and gravity would overcome any expansion locally. However non-locally on the scale of the visible universe the expansion is readily mesureable and visible.
Cheers
Paul
|