In space verry little particles are moving in all kinds of directions. The movement of these gravityparticles seems the movement of gasmolecules. There are two differences. Gravityparticles are moving much faster than gasmolecules and they can penetrate objects. When they penetrate an object, their velocity decreses. An object that is on the earth’s surface, is hit at all sides by gravityparticles. In the horizontal plane, the forces, who are formed by collisions with gravityparticles, cancel. In the vertical direction a stream of gravityparticles goes into the earth’s bott0m. An other stream comes out of the b0tt0m with a smaller velocity. Each stream exerts a force on the object. The difference between the forces of both streams is gravity.