↑ To have any field , that affects , effects and causes , ( in no particular order of actions ) , of a physical thing , Implys , that the field its self , is also physical in Nature .
Newton told us that the speed of the gravitational field is infinite. The gravity equation is: F = G*M*m/R^2. No matter what the speed of the object is, it cannot escape the influence of the gravitational field. Now we know that the speed of the gravitational field is limited, which is equal to the speed of light c. The gravity equation is: F = (G*M*m/R^2) * [(c-v) / c ]. When the speed of the object in the direction of the gravitational field reaches c, it can escape the influence of the gravitational field. This is the simple chasing effect between the gravitational field and the object. This new gravitational equation can accurately calculate the planet's orbit, which is a modification of Newton's gravitational equation. The essence of space-time described by GR is to describe the chasing effect between gravitational field and objects.
Sorry to remind you, no object with mass can reach c. If you posit massless objects in that equation, you will surely encounter divide-by-zero errors.
How do you know that the speed of an object cannot reach c? It was the guy named Einstein who told you. Special relativity is a fallacy. Using F = (G*M*m/R^2) * [(c-v) / c ], we can accurately calculate the planet's orbit. We must speak with data, not assumptions! guess! Measuring the speed of light on the earth is like measuring the speed of sound in an airplane. No matter which direction you measure, the speed of light is constant. The light was hijacked by the gravitational field.