posted on Jul, 3 2004 @ 09:57 AM
Put it like this;
The speed of light in a vacuum, c, is 99% definitely 3 x 10 ^ 8 and that will not change.
If light, howerver, as I think you are suggesting, slowed down too much, would simply result in our views of other galaxies being more out of time
than they are at the moment..
If light, however, did 'shift', then we would still be able to see the other end of the spectrum, e.g. if there was too much red shift, we'd still
see what was the ultra-violet, if it shifted too much blue, we'd see the infra-red