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
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