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" ... But when we move on to look at the strong nuclear force, the rules become fundamentally different. Instead of one type of charge (gravitation) or even two (electromagnetism), there are three fundamental charges for the strong nuclear force, known as colors. In addition, colors obey different rules than the other forces. They include the following: ... "
" ... Later in the 1800s, Maxwell’s theory of electromagnetism allowed us to derive a form of charge-free radiation: an electromagnetic wave that travels at the speed of light. At last, the light wave had a mathematical footing where it was simply a consequence of electricity and magnetism, an inevitable result of a self-consistent theory. It was by thinking about these very light waves that Einstein was able to devise and establish the special theory of relativity. The wave nature of light was a fundamental reality of the Universe. ... "
" ... Ripples in spacetime are what gravitational waves are, and they travel through space at the speed of ... [+] light in all directions. Although the constants of electromagnetism never appear in the equations for Einstein's General Relativity, gravitational waves undoubtedly move at the speed of light. ... "