According to our current understanding of physics, the speed of gravity is believed to be equal to the speed of light in a vacuum. This concept is derived from Albert Einstein's theory of general relativity, which describes gravity as the curvature of spacetime caused by mass and energy.
In general relativity, gravitational interactions propagate through spacetime as waves, similar to how electromagnetic waves (such as light) propagate. These gravitational waves are predicted to travel at the speed of light.
Experimental observations, such as the detection of gravitational waves by the Laser Interferometer Gravitational-Wave Observatory (LIGO), support the notion that the speed of gravity is consistent with the speed of light. The observed arrival times of gravitational waves from distant astrophysical events align with the predictions based on the speed of light.
However, it is essential to note that the definitive experimental verification of the speed of gravity and its exact nature is an ongoing area of research. Future observations and experiments may provide more precise measurements or potentially reveal new insights that could refine or expand our understanding of gravity and its propagation speed.