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Gravitation, or gravity, is a natural phenomenon in which objects with mass attract one another. In everyday life, gravitation is most familiar as the agent that gives weight to objects with mass and causes them to fall to the ground when dropped. Gravitation causes dispersed matter to coalesce, thus accounting for the existence of the Earth, the sun, and most of the macroscopic objects in the universe. Gravitation is responsible for keeping the Earth and the other planets in their orbits around the Sun; for keeping the moon in its orbit around the Earth; for the formation of tides; for natural convection, by which fluid flow occurs under the influence of a density gradient

and gravity; for heating the interiors of forming stars and planets to very high temperatures; and for various other phenomena observed on Earth.

Gravitation is one of the four fundamental interactions of nature, along with the strong force electromagnetism and the weak force. Modern physics describes gravitation using the general theory of relativity, in which gravitation is a consequence of the curvature of spacetime which governs the motion of inertial objects. The simpler Newton's law of universal gravitation provides an accurate approximation for most calculations.

Answer2:

The force of Gravity causes the apple to fall to the ground. Gravity works through the creation of a velocity field around matter, that causes an energy field between masses.

The energy field creates a scalar energy -mGM/r and a vector Momentum energy cmV=cP. Thus the energy is W = -mGM/r + cP, a Quaternion energy. This Quaternion energy is a New Law of Gravity that identifies so-called "Dark Energy" as the vector Momentum energy and the source of the redshift from the Continuity Condition;

mv2/r =cDEL.P = cp/r cos(P).

vp/r =cp/r cos(P)

v/c = cos(P) the redshift.

The general theory of relativity does not describe gravity, it does not account for the "Dark Energy" cP and the redshift as does the Quaternion Theory of Gravity,

W = -mGM/r + cP.

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