| Mach Principle
Newton did an experiment called the rotating bucket of water. He was trying to understand the absoluteness of acceleration. This experiment was commonly interpreted to be an experiment of absolute space and time.
in modern quantum theory of radiation physics, the photons cannot be accelerated. It is always moving at a constant speed of about 186,000 miles per second. While moving through matter, the speed of the photon can be less than the speed of charge particles. This phenomenon is known as Cerenkov radiation discovered in 1934 by the Russian physicist pavel Cerenkov. |