In a message dated 2/22/99 4:47:48 AM Central Standard Time, firstname.lastname@example.org writes:
<< If ``we'' could create a specific matter/space configuration with less
density than vacuum, then ``we'' would need to update the theory to
handle this new case, as it probably would allow for FTL motion.
Such as in the bending of space, like with black holes, they suck light in at like twice their speed. So it is in this case that light is travelling faster, relatively. But it's also implied it goes the same speed, just uses a wrinkle in time. Light moving through water or whatever also goes the same speed, its just refracted.