[MD] constant

[Magnus Berg]

Hi

On 2010-09-02 12:45, Horse wrote:
> Hi Marsha
> It probably depends on what you mean by a vacuum but I was having an
> interesting conversation with a friend of mine yesterday about C.
> Apparently, from what I gather he was talking about, C is no longer a
> constant but is dependent upon the curvature of space - i.e. if there is
> a gravitational difference in one area of the universe compared to
> another area (E.g. a singularity) then there will be a difference in the
> value of C!

Actually, c will still be constant because even if space is stretched 
out, light will still travel so and so many km per second. It's just 
that a km gets longer if space is stretched out. So, *locally* (inside 
the stretched space), light travels at c, but from a point outside the 
stretched space, the light will have travelled faster than c.

	Magnus