What is a "Gravity Could Detect 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.

Does gravitational lensing affect the speed of light?

However you can interpret gravitational lensing to be due to changes in the speed of light, and since we can measure the gravitational lensing due to the Sun you can argue we have measured its effect on the speed of light. This isn't really true as what gravitational lensing measures is the spacetime curvature.

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.

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.

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What is a "Gravity Could Detect Speed Light"? The Most Authoritative Explanation.

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