Possible reason: 1. If the speed of the gravitational field is c, then it must be very special and there is no chasing effect. 2. If the gravitational field has a chasing effect, just like the Doppler effect of light, then the speed of the gravitational field will not be c, but much greater than c. The finite velocity of any object can be ignored, and the gravitational action is instantaneous . I am back.Please Register or Log in to view the hidden image!