What reason is behind gravitational force means that the source of why it happens?

Such as newtons of gravitaion universal law that every object. Some mass attract other objects with momentum. (Gravitational pull), then why not force these things occurred that caused this force?

Every object that the land on Mars or other objects that appeal. Enforcement of this place called gravitational force. Includes all materials or molecules. atoms. Each of these atoms or molecules of a nucleus. Within it. Forced Gravititional. Real strength is derived from the nucleus of an atom. When the mass of the object of increasing strength. gravititional.

Universal Pull

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