Anything which has 'rest mass' in nth dimension, tries to accelerate in (n+1)th dimension with an accelerating force, the force is known as Gravitational Force and this phenomenon is called 'Gravity'. This happens because the (n+1)th dimension is extremely and infinitesimally low-pressured for a gravitational object with n-dimensions, and as everything in the universe tries to maintain a delicate balance of equilibrium. The following is a set of characteristics of an object which is 'gravitational'...
Any object which can exert or experience gravity, must have the following characteristics or follow these three 'postulates':
- The object must possess 'rest mass': Possessing some rest mass will make sure the object cannot be traveling (with reference to the closest gravitational object) at or more than the velocity of 'c', i.e., 2.9979458*10^8 meters/second. - The object will catch(attract or get attracted to) another object with 'rest mass': Adding to what is stated in the main explanation, a gravitational object will try to expand to another gravitational object so that both will form a single referenced-object and expand to the (n+1)th dimension in 'unity'. - The object will throw(repel or get repelled by) another object with 'no rest mass': Anything with no rest mass(similar to electromagnetic waves and radiation), will be thrown by an object with 'rest-mass' in such a way that it can't accelerate once thrown, at the velocity of 'c'(referenced earlier).
Example 1 (Earth's Gravity)
Being a 3D object with rest mass, Earth catches(pulls) anything else with rest mass(humans, trees, grass, water molecules, atmospheric gases etc.,) and tries to expand in the 4th dimension(with time being the additional dimension to xth, yth and zth dimensional axes) and throws(reflects) anything with no rest mass(Visible light, photons, bosons, fermions, X-rays, Gamma rays, etc.,) at the velocity of 'c'.