--- Stephen Hodge
<s.hodge@...> skrev:

> OK, perhaps my introduction of the speed of light is
> not very compelling --
> I used it because it is taken as a given by modern
> physics that nothing in
> the universe can exceed the speed of light.

I think it says that *no information* kan exceed the
speed of light. In an expanding universe two galaxies
can, at least according to some theories, go away from
each other faster than light - but then they will be
beyond each other's horizons, so you can't see one of
them from the other.

And then, in the case of immediate rebecoming, there
is of course the difference between objective and
subjective time. I don't think astronomers today like
to speak at all about "simultaneity" over interstellar
distances.

Gunnar


gunnargallmo@...