What is a "Gravity Signals Could Speed Light"? The Most Authoritative Explanation.
How fast is gravity compared to light?
Kopeikin and Fomalont concluded that the speed of gravity is between 0.8 and 1.2 times the speed of light, which would be fully consistent with the theoretical prediction of general relativity that the speed of gravity is exactly the same as the speed of light.What is the speed of light?
Thus, the speed of "light" is also the speed of gravitational waves, and further the speed of any massless particle.What is the speed of gravitational waves?
The speed of gravitational waves in the general theory of relativity is equal to the speed of light in a vacuum, c. Within the theory of special relativity, the constant c is not only about light; instead it is the highest possible speed for any interaction in nature.Do Gravitational waves always move at the speed of light?
Gravitational waves, like any form of radiation, have zero rest mass and yet have finite energies and momenta, meaning that they have no option: they must always move at the speed of light. This has a few fascinating consequences.
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