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In fact, this is so stable that it is now used as the definition of time
However, the meter is based on the speed of light in vacuum.
The SI definition of the second also depends on the electromagnetic force, being measured by the frequency of a transition in caesium 133. http://en.wikipedia.org/wiki/Caesium_standardIf something changed the velocity of light (electromagnetic radiation) in a vacuum, then it may potentially also modify this definition of time.
If light travels through some medium other than a vacuum, the electric and magnetic fields of the light interact with the electrons in the material it is traveling through, slowing down the light.
Please quote the source that says that blackholes prefer anti matter to matter I thought that gravity made no distinction.
A slightly more precise, but still much simplified, view of the process is that vacuum fluctuations cause a particle-antiparticle pair to appear close to the event horizon of a black hole. One of the pair falls into the black hole whilst the other escapes. In order to preserve total energy, the particle that fell into the black hole must have had a negative energy (with respect to an observer far away from the black hole). By this process, the black hole loses mass, and, to an outside observer, it would appear that the black hole has just emitted a particle.
The speed of light in a vacuum is derived from the permittivity and permeability of free space. It is reasonable to assume......