There are certain mediums modify the speed of light. How do we know what type of interstellar (and intergalactic)! gasses, and sorts of matter are between we and the stars to the oldest galaxies? This doesn't even take into account of things like the manifestations of gravity exotic matter etc. I happen to think (with the new telescopes coming on line, as well as advances in particle physics), that the age of the universe as well as some dearly held cosmologic models will be completely revised.
However with that in mind lets assume that the speed of light is 186,000mps (in an interstellar space as well as a vacuum), that is no guarantee that there is nothing beyond our "light horizon."'
MrA
