A body in motion distorts space.
The faster the motion, the more distortion.
This distortion (making the space around it non-Euclidian) is called gravity.
All matter in our solar system is travelling at 600 kilometers a second, as part of the Milky Way Galaxy.
The cumulative effect of the distortion of space around each particle on earth, say, results in the total gravitational field around the earth.
It is not the mass of the earth that causes the gravitational field, it is the motion of that mass.
