The
speed of light is possibly the only absolute measure in the Universe.
In a vacuum, photons always move at the same speed. A photon moving
through a specific opaque material will also always move at the same
speed although at one that is less than the speed of light in a vacuum.
A photon always moves at lightspeed because it is a
slave to its properties. The properties of a photon are that it is
a
centrifugally structured blackhole, that it is within the
photonic
masses, that its
spin and its
speed are in equilibrium, and that it is
moving at
lightspeed. Vary any one of those properties and the others
will automatically adjust so that the photon continues to move at
lightspeed.
Emit a photon from a stationary object
and it will stabilise at lightspeed. Emit a photon from a moving object
and the stabilisation process will take account of the speed
at which the object is moving so that the photon will still
stabilise at lightspeed. Emit a photon in one direction from an object
that is moving in another and the stabilisation process will
take account of both the speed and direction so that the photon will
still stabilise at lightspeed. A photon moving through an opaque
material is actually moving through the gravitonstreams of the
atoms that make up that material and will take account of the dynamic
mass of the gravitonstreams to maintain itself at lightspeed (usually at a
lightspeed that is less than lightspeed in a vacuum but at a lightspeed
which is predictable).
As
regards the Ives-Stilwell
experiment,
time does not dilate but an apparatus can expand
or contract. Every apparatus is ultimately made out of gravitons.
The gravitons are spinning and speeding. Accelerate an apparatus, or a
part of
an apparatus, and the
spinspeed of its gravitons will alter accordingly
and
predictably. Time is measured by reference to changes in the
conditions of gravitons, or objects made of gravitons, from one moment
to a
succeeding moment.